Gibraltar Building Products 13193 27 in. x 97 in. x 3/8 in. Galvanized Steel 3.4 Hi-Rib Lath Installation guide

Metal Lath and Accessories

QUALITY PRODUCTS – COAST TO COAST

www.amico-lath.com | 800.366.2642

#

Table of ConTenTs

Diamond Mesh Lath ................................... Page 1

Flat Lath (Galvanized and Stainless Steel)

Self-Furred Lath — Dimpled

Self-Furred Lath — V Grooved

Tilath TM Paper Backed Metal Lath ........... Page 2

Flat and Self-Furred Tilath TM

Tilath TM Rib Lath (1/8” Rib)

Tilath TM Starter Strips

Rib Lath ..................................................

Page 3

1/8” Flat Rib Lath

3/8” High Rib Lath

Support Spacing for Metal Lath ............

Page 3

Spray Lath Products ................................. Page 4

Spray Rib Lath — Flat (1/8”) Rib

Spray Rib Lath — High (3/8”) Rib

Managing Quality Control ......................... Page 4

Metal Accessories ..................................... Page 5

X-1 Corner Bead

X1-N Narrow Wing Corner Bead

X-2 Reinforced Corner Bead

Cornalath (Cornerite)

Striplath

Metal Accessories ................................ Pages 6-9

X-66 Expanded Flange Casing Bead

N-66 Narrow Wing Casing Bead

J-Metal Bead

Foundation Weep Screed (FHA #7)

Control Joint (VV or M Type, #15 Joint)

Inside Corner Control Joint (#30 Joint)

Griplock J Control Joint (#XJ15 Joint)

M-Slide TM 2-Piece Expansion Joint

Zinc Control Joint

Installation Guidelines for Metal Lath ... Page 10

Installation Detail Photos ..........................Page 11

Metal Lath Specification ................... Pages 12-13

Specialty Metal Products ........................ Page 14

N093 Drywall/DEFS Control Joint

Wire Corners

Galvanized Hanger and Tie Wire

Galvanized Cold Rolled Channel

SS304/316 Stainless Steel Lath ............. Page 15

Secura Lath ® Spec Data ........................... Page 15

Security Mesh TM System .......................... Page 16

Security Mesh TM Specification ................ Page 17

Manufacturing &

Distribution Centers ........................... Back Cover


alabama meTal IndusTrIes CorporaTIon

3245 Fayette Avenue • Birmingham, AL 35208

Phone (205) 787-2611 • (800) 366-2642 • Fax (205) 786-6527

www.amico-lath.com

diamond mesh lath

Flat Lath

is manufactured from prime quality steel sheets that are slit and expanded to form small diamond shaped openings. This large number of openings provides more plaster keys, providing better scratch coat bonding in either pumped or troweled applications. Each sheet has square ends and smooth parallel edges on sides for fast, easy handling and bending for curved surfaces.

Weight/

sq. yard

Sheet Nominal Sheets/ Bundles/ Pallet size bundle pallet weight

1.75 lbs.* Galvanized 3.5 lbs. 27” x 97”

2.5 lbs. Galvanized 5.0 lbs. 27” x 97”

10

10

50

50

1750 lbs.

2500 lbs.

3.4 lbs.

1.75 lbs.

2.5 lbs.

3.4 lbs.

Galvanized 6.8 lbs. 27” x 97”

Stainless 3.5 lbs. 27” x 97”



10

10

10

10

50

25

25

25

3400 lbs.

875 lbs.

1275 lbs.

1700 lbs.

Self-Furred Lath

is used extensively in exterior stucco and stone work over sheathing and as a plaster base over masonry walls. Self-furring dimples or embossed “V” grooves hold the lath approximately ¼” away from solid surfaces to aid in the keying of stucco to the lath. AMICO self-furred lath does not require additional self-furring mechanisms to function as required by ASTM C1063.

Dimpled

(dimple spacing 5¼” on length with offset rows 5¼” apart on width)

Weight/

sq. yard

Sheet Sheet


Sheets/ Bundles/ Pallet

10 25 875 lbs.



10

10

25

25

1250 lbs.

1700 lbs.

V Grooved

(embossed “V” grooves spaced 6” on center lengthwise)

Weight/

sq. yard

Sheet Sheet Sheets/ Bundles/ Pallet




10

10

10

50

50

50

1750 lbs.

2500 lbs.

3400 lbs.

As per current revisions of ASTM C-1063, metal lath applied to solid substrates must have ¼” self-furring properties, built into the lath sheet. Therefore, AMICO recommends the use of self-furred (SF) lath over solid substrates, as required by current codes. Self furred lath is not required over framing members less than 1 5 /

8

” in diameter or over open framing. (25-bundle pallets available in Fontana, CA facility.)

*1.75 lb. is not recognized in ASTM C847, but is referenced in one-coat stucco systems and tile work.


1

Tilath

TM

paper backed metal lath

Tilath

TM is diamond mesh lath, regular or self-furred, to which Grade D, Style 2, asphalt saturated paper (WRB) is applied in an “offset” fashion, providing a ship lap application, per ASTM C-1063 (see the illustrations below). Tilath is an ideal selection for applications requiring two layers of WRB, where the synthetic air barrier provides the first barrier. Furthermore, Tilath is an ideal choice for veneer stone installations when the first WRB is already installed.

Flat and Self-Furred Tilath

TM

Weight/

sq. yard*

Sheet Sheet





10

10

10

25

25

25

920 lbs.

1295 lbs.

1745 lbs.

* Weight per sq. yard does NOT include the Grade D WRB; sheet weight DOES include the approximate weight of the paper.

Tilath

TM

Rib Lath (1/8” rib)

Weight/

sq. yard

Sheet Sheet Sheets/ Bundles/ Pallet



10

10

25

25

1420 lbs.

1745 lbs.

* Weight per sq. yard does NOT include the Grade D WRB; sheet weight DOES include the approximate weight of the paper.

Tilath

TM

Starter Strips

are compatible Grade D asphalt paper strips to be used over the foundation weep screed when installing offset, paper backed lath. Starter Strips are printed with incremental 1” marks and larger marks at 12” and 16” to assist the installer in fastening to the wall framing. Because of their Weather Resistant Barrier (WRB) properties, they also provide protection around doors and windows, behind stucco accessories and anywhere WRB strips are needed.

Roll Size Rolls/Carton Carton Weight Cartons/pallet

6” x 225’ 6 30 lbs. 30

Lath

Attachment

Detail

Tilath TM Paper Backed Lath Construction Detail

Tilath TM is produced with lath and WRB offset on one side and end to allow the lath to overlap at sheet joints. Tilath TM is to be “shingled” up the wall, beginning with a 6” Tilath Starter Strip

(Grade-D paper) at base of wall, placing the Starter Strip over the weep screed attachment flange. Then, the Tilath sheet is attached with metal overhang facing down so that the lap detail can be achieved (as shown at right).

4½”

2”

2


rib lath

Rib Lath

is used for stucco and stone applications and has unique solid metal “ribs” running parallel down the length of the lath sheet. The rib lath sheet provides greater stiffness and is allowed to span over studs, specific to the product applications outlined below. See Support Spacing for Metal Lath (below) for product selections.

1/8” Flat Rib Lath

has eighteen ribs, 1 /

8

” high, spaced 1½” on center. The

2.75 lbs. product may be installed over horizontal spans up to 16” on center, and the

3.4 lbs. product may be installed over spans of 19” on center, when following ASTM

C-1063. This lath sheet still requires furring on solid substrates.

Weight/

sq. yard

Sheet Sheet




10

10

50

50

2750 lbs.

3400 lbs.

3/8” High Rib Lath

is designed with seven longitudinal ribs (each 3 /

8

” deep) and eight small flat ribs in between the high ribs. This product is used almost exclusively for ceiling and soffit applications. ASTM C-1063 allows High Rib Lath to span up to 24” on center between framing both vertically and horizontally.

Weight/

sq. yard

Sheet Sheet




10

10

50

50

3400 lbs.

4000 lbs.

support spacing for metal lath

(adapted from ASTM C-1063, table 3)

Types of Lath

3

Diamond Mesh Lath

Flat Rib Lath

Nominal Weight

(per sq. yard)

2.50 lbs.

3.40 lbs.

2.75 lbs.

3.40 lbs.

3.40 lbs.

V e R T I C A L S P A C I N g ( I N C h e S )

Wood Solid Plaster (Metal) Other (Metal)

16 1

16 1

16

19

24

16

16

16

24

24

1

1

2 h O R I z O N T A L ( I N C h e S )

Wood or Concrete

12

16

Metal

12 12

16 16

16 16 16

19 19 19

24 24 24 3/8” Rib Lath

1 Spans may be increased to 24” o.c. with self-furred metal lath over solid sheathing assemblies approved for this use.

2 May be used in studless partitions.

3 Metal lath used as reinforcement for plaster substrate shall be furred away from vertical supports at least 1/4”. Self-furred lath meets furring requirements.

EXCEPTION: Furring of expanded metal lath is not required on supports having a bearing surface width of 1 5/8” or less.


3

spray lath products

Spray Lath is used primarily on the West coast, where stucco is spray applied to the surface of the lath to build stucco thickness.

Rib Lath is often attached directly to the vertical framing members without a solid board substrate included.

AMICO spray products include:

Spray Rib Lath - Flat (1/8”) Rib

has two (2) strips of kraft paper, 12” wide, attached to the lath, permitting visual alignment of lath for mechanical attachment of the rib to the substrate. Flat Rib is allowed by Building Code to span 16” on center for the 2.75 lb. Flat Rib, 19” on center for 3.4 lb. Flat Rib.

Weight/

sq. yard

Sheet size

2.75 (1/8”) lbs. 27” x 97”

2.75 (1/8”) lbs. 27” x 48”

Sheet Sheets/ Bundles/ Pallet weight bundle pallet weight

5.5 lbs.

2.75 lbs.

10

10

50

50

2750 lbs.

1375 lbs.

Spray Rib Lath - High (3/8”) Rib

is a more rigid lath product than

Diamond Mesh, and like Spray Lath, has strips of kraft paper attached between the ribs. The additional rigidity is well suited for horizontal applications such as soffits.

The 3.4 lb. High Rib allows for (up to) 24” spans.

Weight/

sq. yard

Sheet size

3.4 (3/8”) lbs. 27” x 97”

Sheet Sheets/ Bundles/ Pallet weight bundle pallet weight

6.8 lbs. 10 50 3400 lbs.

managing Quality Control

Metal lath may look the same when palletized and stocked in the warehouse, but may be different when observed in the bundles, on the jobsite. Before it’s installed, is it the correct weight, length and width?

To be assured your lath is CODE COMPLIANT, AMICO straps all diamond mesh bundles with the appropriate identification, including weight, ASTM #, ICC-ESR# and Made in

U.S.A. Furthermore the lath bundle’s straps are color-coded (red strapping for 3.4#, blue for 2.5# and yellow for 1.75#) for your assurance.

As AMICO lath bundles are brought to the job, one can be assured they are

CODE COMPLIANT by observing color coded strapping complies with the project specifications. Each bundle is identified as seen here:

4


metal accessories

Corner Beads (X-1 and X-2)

provide exterior corner protection and a straight ground for screeding. The X-1 Corner Bead has a 3” wide flange that is flexible and adaptable to various ground heights. The

X-1-N Narrow Wing Corner Bead has the same design as X-1, but with a shorter, 2½” wide flange. The X-2 Reinforced Corner Bead is superior in strength to X-1, due to added stiffener strips in the 3¼” wide flanges. The chart below outlines the specifics of each style.

Pieces/ Weight/ Cartons/ Pallet

Style Length** Finish carton carton pallet weight

X-1* 10’ Galvanized 30

X-1 10’ Zinc 30

56 lbs.

49 lbs.

21

21

1166 lbs.

1008 lbs.

X-1-N 8’ Galvanized 40

X-1-N 8’ Zinc 40

X-1-N 10’ Galvanized 30

X-1-N 10’ Zinc 30

55 lbs.

48 lbs.

20

20

1095 lbs.

935 lbs.

51 lbs. 21 1078 lbs.

44 lbs. 21 920 lbs.

X-2 10’ Galvanized 30

X-2 10’ Zinc 30

Wire 8’, 9’,10’ Galvanized 40

76 lbs. 21 1600 lbs.

67 lbs. 21 1407 lbs.

44 lbs. 24 1056 lbs.

*Also available in Stainless Steel

AMICO Wire Corners are discussed further on page 14 (Specialty Products)

Cornalath (Cornerite)

is used in corners where walls intersect with walls or ceilings. The reinforcing of corners helps prevent cracks.

The 105º angle offers resistance when pushed into the transition. Available in galvanized steel only.

X-1

X-2

2” x 2” – 4’ 125 35 lbs. 30 1050.0 lbs.

2” x 2” – 8’ 75 50.4 lbs. 21 1058.4 lbs.

3” x 3” – 8’ 75 70.8 lbs. 15 1062.0 lbs.

Striplath

is galvanized, diamond mesh lath, produced in 4” and

6” wide strips with smooth edges. Striplath is used to reinforce plaster around door and window corners, reducing cracks caused by stress.

4” x 8’ 75 50.4 lbs. 20 1008 lbs.

6” x 8’ 75 70.8 lbs. 20 1416 lbs.

**Other lengths available by request

AMICO recommends the use of zinc or vinyl accessories for all exterior applications. Contact your AMICO representative for a vinyl catalog or visit our website.


5


X-66 Expanded Flange Casing Bead

(sometimes called “plaster stop” or “J-bead”) has a 3” expanded mesh flange with a 1/4” return leg. This trim is used to terminate plaster or stucco around doors, windows or any other opening. The chosen ground height aids in screeding the proper thickness of stucco.

Pieces/

ground Length carton

3/8”

1/2”*

5/8”

3/4”*

7/8”*

1”*

1 1/4”

1 1/2”

10’

10’

10’

30

30

30

10’ 30

10’ 30

10’ 30

10’

10’

30

30

Galvanized 44 lbs.

Zinc 42 lbs.

Galvanized 47 lbs.

Zinc 44 lbs.

Galvanized 49 lbs.

Zinc 47 lbs.

Galvanized 51 lbs.

Zinc 49 lbs.

Galvanized 53 lbs.

Zinc 51 lbs.

Galvanized 56 lbs.

Zinc 53 lbs.

Galvanized 59 lbs.

Zinc 56 lbs.

Galvanized 76 lbs.

20

20

20

20

20

20

20

20

880 lbs.

840 lbs.

940 lbs.

880 lbs.

980 lbs.

940 lbs.

1020 lbs.

980 lbs.

1060 lbs.

1020 lbs.

1120 lbs.

1060 lbs.

1180 lbs.

1120 lbs.

1520 lbs.


All X-66 Beads can be supplied with punched holes in the ground, but should not be used in lieu of a

#7 FHA full weep screed at base of wall, in compliance with ASTM C1063.

N-66 Narrow Wing Casing Bead

has the same basic profile as

X-66, but without the expanded flange. Nail and keying holes are provided in the flange, which is approximately 1 3 /

8

” wide. Weep holes are optional on all grounds.

Pieces/

ground Length carton

3/8”

1/2”

3/4”

7/8”

1”

10’

10’

10’

10’

10’

30

30

30

30

30

Galvanized 37 lbs.

Zinc** 35 lbs.

Galvanized 39 lbs.

Zinc** 38 lbs.

Galvanized 44 lbs.

Zinc** 41 lbs.

Galvanized 47 lbs.

Zinc** 44 lbs.

Galvanized 47 lbs.

Zinc** 45 lbs.

**Not a stock item. Call for lead time.

30

30

30

30

30

1110 lbs.

1050 lbs.

1170 lbs.

1140 lbs.

1320 lbs.

1230 lbs.

1410 lbs.

1320 lbs.

1440 lbs.

1350 lbs.

6


J-Metal Bead

will accommodate up to 1” of rigid insulation and one-coat stucco direct applied systems or thin-veneer stone. The 26-gauge J-Metal can be punched for weep in ground flange as requested. Weeps spaced at 6” centers.

ground A

3/8”

1/2”

3/4”

7/8”

1 3/8”

1 1/2”

Length

10’

10’

10’

10’

10’

10’

Pieces/ Nailing flange Weight/ Bundles/ bundle height B bundle pallet

10 3 1/2” 26 lbs. 50

10

10

10

3 1/2”

3 1/2”

3 1/2”

28 lbs.

29 lbs.

30 lbs.

50

50

50

10

10

1 3/4”

3 1/2”

1 3/4”

3 1/2”

21 lbs.

35 lbs.

24 lbs.

36 lbs.

100

50

100

50

Nailing flange width B

Ground A

Foundation Weep Screed (FHA #7)

is required at the base of walls as part of a drainage system for exterior stucco or veneer stone applications. The

3½” nailing flange serves as flashing when Grade D building paper or Tilath TM Starter

Strips are installed over the flange. Holes are punched into the nailing flange for easy attachment to the wall. Holes are also placed in the “V” stop to provide keying of the stucco mud when wet. As the mud cures, it will shrink slightly away from the

“V” stop, allowing moisture to flow down the building paper and exit the sloped “V” stop surface. FHA #7 is manufactured in 26-gauge galvanized metal and zinc alloy.

Contact AMICO for availability.

Pieces/ Nailing Weight/ Bundles/

ground A bundle flange width Finish bundle pallet

1/2” 10 3 1/2”

Galvanized

Zinc*

32 lbs.

28 lbs.

100

5/8”

7/8”

1 3/8”

1 1/2”

10

10

10

10

3 1/2”

3 1/2”

3 1/2”

3 1/2”

Galvanized

Zinc*

Galvanized

Zinc*

Galvanized

Zinc*

Galvanized

Zinc*

34 lbs.

30 lbs.

36 lbs.

32 lbs.

41 lbs.

37 lbs.

43 lbs.

39 lbs.

100

100

100

100

*Not a stock item. Call for lead time.

3 1/2”

Ground A


7


Expansion Joints versus Control Joints

Control Joints (CJ) are 1-piece joints designed to relieve stress and minimize cracking; they accommodate initial stucco shrinkage and minor thermal movement. The Control Joints are required to form membrane panels no larger than 100 sq.ft for ceilings and

144 sq. ft. for walls. On the other hand, expansion Joints (eJ) are 2-piece joints designed to accommodate a full break through the structure across dissimilar surfaces or to deal with some minor structural movement.

AMICO Control Joint (VV or M-Type, #15 Joint)

is designed to provide for movement to accommodate expansion and contraction caused by initial stucco shrinkage and minor thermal movement. Produced in galvanized steel and zinc alloy in 10’ lengths.

Weight/ Cartons/ Pallet Pieces/

ground carton

3/8” 24

Galvanized

Zinc

1/2”

5/8”

24

24

Galvanized

Zinc

Galvanized

Zinc

3/4”* 24

7/8” 24

Galvanized

Zinc

Galvanized

Zinc

49 lbs.

45 lbs.

66 lbs.

50 lbs.

65 lbs.

58 lbs.

71 lbs.

61 lbs.

83 lbs.

71 lbs.

20 / 40 980 / 1960 lbs.

20 / 40 900 / 1800 lbs.

20 / 40 1320 / 2640 lbs.

20 / 40 1000 / 2000 lbs.

20 / 40 1320 / 2640 lbs.

20 / 40 1150 / 2300 lbs.

20 / 40 1420 / 2840 lbs.

20 / 40 1220 / 2440 lbs.

20 / 40 1660 / 3320 lbs.

20 / 40 1420 / 2840 lbs.


Inside Corner Control Joint (#30 Joint)

is similar to the standard M Type joint, but the flanges are bent to an angle to form inside corners, allowing movement. Produced in galvanized steel or zinc alloy in 10’ lengths. Verify availability and lead-time.

Pieces/

ground carton

1/2” 24

3/4”* 24

7/8” 24

Galvanized

Zinc

Galvanized

Zinc

Galvanized

Zinc

66 lbs.

50 lbs.

71 lbs.

61 lbs.

83 lbs.

71 lbs.

20

20

20

1320 lbs.

1000 lbs.

1420 lbs.

1220 lbs.

1660 lbs.

1420 lbs.


8


Griplock J Control Joint (#XJ15 Joint)

is similar to the M

Control Joint except the J design provides locking of the stucco to the edge of the joint. This design helps reduce stucco separation at the edge of the joint when stucco is forced under the J flange. Produced in 10’ lengths. Griplock J comes pre-taped to ensure a clean joint.

Pieces/

ground carton

1/2”

3/4”

7/8”

24

24

24

Galvanized

Zinc

Galvanized

Zinc

Galvanized

Zinc

70 lbs.

61 lbs.

77 lbs.

64 lbs.

80 lbs.

66 lbs.

20

20

20

1400 lbs.

1220 lbs.

1540 lbs.

1280 lbs.

1600 lbs.

1320 lbs.

M-Slide

TM

2-Piece Expansion Joint (Horizontal and

Vertical)

is a new water management accessory that works like the #40

Joint for movement, but improves the flashing and drainage from the area as needed. The M-Slide TM horizontal combines a weep screed design with a larger, solid flange (on bottom) to provide intermediate flashing/drainage at mid-floor expansion.

The M-Slide TM Vertical utilizes larger flanges and a stiffer design to

“pre-set” the vertical joint for proper attachment. Both versions are produced in 25-gauge, G-90 pre-galvanized steel finish, providing additional protection.

The 7/8” grounds will work for both 3/4” and 7/8” hard-coat systems; other size grounds and zinc alloy are available on request. Produced in 10’ lengths.

Product # grounds

Pieces/ Weight/ Cartons/ Pallet carton carton pallet weight

M-Slide-H

M-Slide-V

7/8”

7/8”

10

10

110 lbs.

88 lbs.

12

12

1320 lbs.

1056 lbs.

Horizontal

Zinc Control Joint

has a solid flange with large holes that aid in the attachment of adjoining metal lath. The improved shoulder design allows for easier stucco embedment and increases holding capacity at the joint to minimize cracking. CJ comes pre-taped to ensure a clean joint. Produced in 10’ lengths.

Product # grounds

Pieces/ Weight/ Cartons/ Pallet carton carton pallet weight

CJ380

CJ500

CJ750

3/8”

1/2”

3/4”

25

25

25

51 lbs.

60 lbs.

66 lbs.

20

20

20

1020 lbs.

1200 lbs.

1320 lbs.

Vertical


9

These installation recommendations are intended to be instructional and accurate. This is first a guideline, providing a general overview and also equips the lather with specific installation details, based on ASTM C 1063 Standard Specification for Installation of Metal Lath.

Always consult your area building official before beginning any project to familiarize yourself with any local code requirements. This guide should not replace the designs and judgments of a qualified engineer and/or architect.

Lath Installation

Permanently attach the Weep Screed (FHA#7) to the solid substrate at the bottom of the wall, a minimum of 4-inches above grade. Begin at the right hand bottom corner of the wall. If paper backing behind the lath is required, leave the paper hanging over at the top and to the left of the sheet.

Offset paper backing has the paper overlapping 1-1/2” on one end and one side and corresponding retracted on the opposite end and side, the sheets should always be installed in a horizontal application perpendicular to the framing.

Begin at the bottom of the wall with a Tilath™ Starter Strip, placed over the weep screed, to assure proper ship-lapping. The Starter Strips are custommade, 6-inch wide rolls of Grade D asphalt paper that have 1-inch incremental markings, to easily identify the location of the stud wall framing.

Laps: Minimum of 1” at edges with ends nested paper to paper, metal to metal. Apply the second sheet to the left of the first sheet lapping paper over paper and lath over lath. Place the third sheet centered above the first two sheets. This process is similar to that of laying brick. This staggers the vertical butt joint seams and allows a more uniform dispersal of stress.

On horizontal applications all nails shall be driven flush with base. On vertical applications nails shall be bent over to engage at least 3 strands of Diamond

Mesh or through rib on rib lath and bridge ribs with staples.

Lath Fasteners (per ASTM C-1063)

Concrete/CMU: use (3/8” diameter shank, 3/4” minimum length).

6 power or powder actuated fasteners, 4 in the corners and 2 in the middle of long edge.

Wood framing: use 11 gauge 1-1/2” length, 7/16” head nails (roofing nails

6d, 1-1/2” x 1/4 head)

Sheathing over wood framing: use 14 gauge, 1” leg, 3/4” crown staples.

Staples shall engage a minimum of 3 strands of lath.

Metal framing: use self drilling, self tapping #12 x 3/4” wafer head screws.

The use of powder actuated or power actuated fasteners is acceptable, but may cause spalling when shot to the substrate; follow manufacturer’s instructions carefully.

Insulated Concrete Forms (ICF): Consult specific ICF manufacturer.

Fastener Spacing

Spacing of nails, staples or screws is not more than 7” on center along the framing member (horizontal or vertical).

Concrete: 6 power actuated fasteners, 4 in corners, 1 on each side of long edge in center.

Span Limitations

Every finish material is subject to span limitations, which is the maximum distance between frame members. When sheathing is not required, 16” on center is the maximum spacing of framing to prevent undue sagging.

Then minimum 2.5 lb. self-furring lath is installed over sheathing or solid surface, the maximum spacing of supports may be 24” on center.

*Note: Lath shall be furred away from vertical supports or solid surfaces at least ¼”. Self-furring lath (Dimpled, V Groove or High-Rib) lath meets these furring requirements. See chart “Support Spacing for Metal Lath” on page

3 (bottom) of this catalog for lath weight/type.

Cut and Trim to Fit

Standard sheet shears or metal cutting scissors are effectively used for notching and snipping. A conventional circular saw equipped with a metal cutting blade easily zips through steel lath to cut to desired lengths.

Wire Tie

(0.0475”, 18-gauge)

Lath is to be wire tied at 9” on center at edges, ends and at laps between framing members. On plywood sheathing only, lath may be nailed or stapled in lieu of tying at the same center spacing noted above.

Accessories

Corner beads shall be used to protect all external corners with a plumb and true edge. Casing beads shall be used to terminate stucco or stone around doors, windows or other openings.

Important Installation Note

Lath accessories are designed to make stucco and stone jobs easier, more efficient and provide the final product a more professional look. To ensure this, accessories should be attached every 7” o/c with nails, staples or tie wires. For control joint, corner and casing beads, the nose can be used as a screed for the stucco brown coat, but must be embedded by 1/8 inch thickness of plaster on the final coat. Be careful not to scrape galvanizing off the accessories.

Controlling Cracks

It is difficult to anticipate or prevent plaster cracks, but they can be largely controlled by means of expansion joints. The expansion joints should be installed between lath. The lath is to be broken underneath the expansion joint to function properly. Fasten the joints to the lath using info found under “Lath Fasteners” section.

Walls and ceilings that use metal lath for the plaster base should be divided into rectangular panels with control joint at least every 18 feet or at the juncture of a dissimilar wall, or in either direction in a length to width ratio of 2½ to 1, or in ceilings exceeding 100 sq. ft. or walls exceeding 144 feet in area.

Control Joints shall be formed by installing a single piece Griplock J TM or

#15 VV-Type accessory. Install the M-Slide TM 2-piece expansion joint where an expansion joint occurs in the exterior wall, or dissimilar substrates align next to each other. M-Slide Vertical is for vertical applications and M-Slide

Horizontal is for horizontal applications used within floor-to-floor framing, etc.

10


Installation detail photos

Attachment of Lath to studs

1) Wafer head screws are power driven to allow quick and easy attachment of Diamond Mesh Lath to framing members.

2) Diamond Mesh Lath can be cut to size with hand tools.

Attachment of Rib Lath to ceilings

1) High (3/8”) Rib Lath is attached to ceiling joist, spaced at 24” o/c max. Flat Rib Lath can span up to 16” o/c.

Attachment to solid surfaces

1) Self-Furred Diamond Mesh Lath is secured to masonry surfaces with hardened concrete nails and power driven fasteners at the furring dimples. Paper backed lath is often used in this type of application as a bond breaker.

Attachment of trims/joints

1) Type “M” Expansion Joint is installed vertically over the window opening allowing for expansion and contraction.

2) The scratch coat is applied with complete embedment of the selffurred lath in the plaster.

2) AMICO X-1 Corner Bead provides protection for outside corners and a reliable straight ground for screeding.

3) Scratch coat is fully embedded in the lath and is isolated from supporting structure. Water resistant backing paper allows controlled and uniform curing of this plaster foundation.

3) X-66 Expanded Casing Bead is typically installed at door and window openings as a plaster stop.


11

metal lath specification

Specification for Metal Lath and Accessories

Section 09100 – Lath and Plaster

Section 04420 – exterior Stone Cladding

Part 1 General

1.1 SECTION INCLUDES

A. All materials, equipment, supplies, to install expanded metal lath for portland cement plaster for [interior] [and] [exterior] applications required for this project.

1.2 REFERENCES

A. ASTM C841 - Standard Specification for Installation of Interior

Lathing and Furring

B. ASTM C847 - Standard Specification for Metal Lath

C. ASTM C926 – Standard Specification for Application of Portland

Cement-Based Plaster

D. ASTM C1063 - Standard Specification for Installation of Lathing and Furring for Portland Cement-Based Plaster

E. International Building Code, Chapter 25.

F. International Residential Code, Chapter 7.

G. EMLA 920– Guide Specifications for Expanded Metal Lathing and Furring, (Expanded Metal Lath Association of NAAMM)

1.3 SUBMITTALS

A. Metal lath submittal shall include the manufacturer’s certification that the lath meets or exceeds the specified weight per ASTM C847. Provide manufacturer’s product literature, ICC-

ESR report, and LEED information prior to ordering.

1.4 STORAGE AND HANDLING

A. All lath and accessories shall be protected from weather per

ASTM C1063 prior to arrival and when stored on the job site.

B. Do not store on end, or place materials on to of the lath.

Part 2 Products

2.1 MANUFACTURER

A. Alabama Metal Industries Corporation, AMICO, 3245 Fayette

Avenue, Birmingham, AL 35208; Telephone 800/366-2642; website www.amico-lath.com

2.2 METAL LATH

A. Metal Lath for vertical surfaces [AMICO Flat Diamond Mesh]

[AMICO Self-Furred Dimple Diamond Mesh] [AMICO Self-Furred

V-Groove Diamond Mesh] lath. [2.5] [3.4] pounds per square yard.

B. Metal Lath for horizontal surfaces [AMICO 1/8-inch Flat

Rib] lath [2.75] [3.4] or [AMICO 3/8-inch High Rib] lath [3.4]

[4.0] pounds per square yard. Metal Lath for high moisture applications stainless steel [grade 304] [grade 316] expanded metal [AMICO Diamond Mesh] [AMICO Self-Furred Dimple

Diamond Mesh] for exterior plastering work [1.75] [2.5] [3.4] pounds per square yard.

C. Paper Backed Spray for spray applied vertical surfaces [AMICO

Paper Backed Spray Lath] [AMICO Paper Backed Spray Lath

V-Rib lath] for spray applied stucco weighing not less than 3.4 pounds per square yard.

D. Paper Backed Spray for spray applies horizontal surfaces

[AMICO Paper Backed Spray Lath Flat 1/8-inch Rib lath] weighing not less than [2.75] [3.4] pounds per square yard.

E. Paper Backed Lath for vertical surfaces [AMICO Tilath ® ] [AMICO

Self-furred Dimpled Tilath ® ] [1.75][2.5][3.4] pounds per square yard with factory applied [20 minute] [60 minute] Grade D, style 2 asphalt saturated paper.

F. Paper Backed Lath for horizontal surfaces [AMICO Tilath ® Rib

Lath (1/8-inch Rib)] [2.75] [3.4] pounds per square yard with factory applied 20 minute Grade D, style 2 asphalt saturated paper.

2.3 FASTENERS FOR LATH ATTACHMENT

A. Lath shall be attached to [vertical] and or [horizontal] framing members spaced in accordance with ASTM C1063 Table 3.

Fasteners; nails, screws or staples per ASTM C1063.

2.4 ACCESSORIES

A. General

1. Accessories shall be produced from [PVC/vinyl] [and or] [hot dip galvanized steel] [and or] [zinc alloy] [and or] [stainless steel] [Grade 304] [or] [Grade 316].

2. Accessory grounds shall be consistent with the plaster thickness.

B. Stress and edge related reinforcement as noted on drawings

C. Stress relief expansion and control joints as noted on drawings

D. Moisture relief accessories as noted on drawings

E. Architectural accessories as noted on drawings

F. Fasteners for accessory attachment

1. Fasteners and their installation in accordance with [ASTM

C1063 for exterior stucco work] [and] [or] [ASTM C841 for interior gypsum plaster work].

2. Any plaster or stucco installation requiring a combination of metal lathing materials that includes stainless steel shall utilize the appropriate fastener made from stainless steel.

2.5 MOISTURE BARRIER PAPER

A. 2 layers of Grade D, Water-vapor permeable; Type 1 Barrier

Paper; Style 2 paper [30 minute] [60 minute], per Federal

Specification - UU-B-790a, UBC Standard 14-1 [or] [paperbacked AMICO Tilath ® metal lath can be installed as one of the two layers of Grade D paper] [or] [pre-approved WRB, Weather

Resistant Barrier equivalent].

12


Part 3 Execution

3.1 EXAMINATION

A. Verify existing conditions before starting work.

B. Verify the sheathing has a 1/8-inch gap on all edges of every sheet.

C. Do not begin work unless all unsatisfactory conditions are resolved.

3.2 MOISTURE BARRIER

A. Shingle the moisture barrier edges, overlapping 2 inches on all sides.

B. Install with mechanical fasteners in a manner that secures the moisture barrier without more fasteners than required for the fastening pattern.

3.3 FASTENERS

A. Lath installed over open wood framing utilizes 11GA x 1-1/2 inch long barbed shank x 7/16-inch diameter head roofing nails or galvanized 4d common nails.

B. Open wood framing secure ends of lath sheets between framing members with open wood framing shall be fastened with 18GA (0.0475-inch) tie wire on 9-inches centers.

C. Lath installed on sheathing over wood framing shall only utilize nails, screws or staples to join lath end joints using 14GA x

1-1/2 inch long staples with a 3/4-inch crown.

D. Fasteners for lath shall be driven into the framing members

3/4-inch and engage at least three strands to secure the lath to the framing members.

E. Spacing of nails, staples or screws shall be no more than

7 inches on center along the any framing member.

F. Staples are not allowed for ceiling applications.

G. Metal Framing applications shall utilize wafer head #12 shank x ¾-inch self-tapping screws.

H. Concrete / CMU use 6 each power actuated fasteners allowing

1-fastener in each corner and 1-fastener centered along the long dimension of the lath sheet.

I. In horizontal applications all nails shall be driven flush with lath.

J. Vertical applications, all nails shall be bent over to engage at least three strands of lath.

K. Fasteners shall penetrate the ribs of rib lath and bridge rib laps with staples.

L. Refer to ASTM 1063 for other lath attachment conditions.

3.4 LATH INSTALLATION TO HORIZONTAL SURFACES

Ceilings constructed with gypsum plaster and larger than 2,500 square feet in area or with any dimension exceeding 50 feet must be unrestrained.

Ceilings constructed with portland cement-based plaster must be unrestrained.

Isolate ceiling lath and plaster from ceiling intersecting vertical surfaces with casing beads, control joints, or similar designs to keep the ceiling isolated from the adjacent vertical surfaces (walls, partitions, beams, and columns).

Do not use corner reinforcement at the internal angle between the ceiling and the vertical surfaces.

3.5 INSTALLATION OF ACCESSORIES

A. General

1. Install accessories prior to the lath in a straight and square manner and to separate structural from non-structural elements such as door and window openings.

2. Accessories to be installed on top of the moisture barrier; foundation weep screed is installed under the top layer of moisture barrier.

3. It is recommended to install vertical running accessories continuously and horizontally running accessories to break or butt at vertical accessories.

4. When butting accessories do not overlap. All joints should be embedded in sealant.

B. Control Joints

1. Control joints shall be formed by using a single prefabricated member with the metal lath terminating and wire tied to the top of the flange portion to permit movement. Lath is to be broken at all control joints and shall be stopped and wire tied at each side.

2. Control joints shall be installed in walls to define areas not more than 144 square feet and areas in ceilings not more than 100 square feet with a maximum distance between control joints not to exceed 18 lineal feet or a ration of length to width of 2½:1.

3. The accessories should be set in sealant prior to stucco application; control joints to be set into a bed of sealant. The sealant shall be applied at all exterior corners, all interior corners, all butt ends, i.e., all joints in the metal lath.

C. Expansion Joints

1. Expansion Joints – 2-piece Joints to be applied to bridge dissimilar surfaces and across expansion joints in the structure.

2. Fasten the expansion joint to each side of the dissimilar or broken substrate, then apply lath over the flanges of the expansion joint and wire tied at each side.

3. Follow fastening spacing outlined in ASTM C1063 at not greater than 7 inches on center.


13

specialty metal products

N093 Drywall/DEFS Control Joint

is similar to the control joint for veneer finish drywall installations or DEFS applications.

It is produced in zinc alloy only and comes with a removable tape across the joint to keep joint clean during installation.

Pieces/ Weight/ Cartons/ Pallet

grounds Length carton carton pallet weight

3/32” 10’ 25 27 lbs. 20 540 lbs.

Wire Corners

provide for rounder corners, embedding all reinforcement. They are manufactured from zinc coated wire, electronically wired to form the corners. Bullnose, arch and short flange configurations come standard in 10’ lengths, but are also available in 8’ and 9’ lengths. They are packaged 40 pieces per carton with 24 cartons per pallet.

Style

Straight

Flange size

Weight/ carton

2.5” x 2.5” 48.0 lbs

Straight BN ( 7 /

8

”) 2.5” x 2.5” 36.8 lbs

Straight 2-wire 2.5” x 2.5” 49.4 lbs

Arch 2.5” x 2.5” 34.0 lbs

Arch BN 2.5” x 1.5” 34.0 lbs

Style

Bullnose

Bullnose short

Flange size

Weight/ carton

2.5” x 2.5” 48.0 lbs

2.5” x 1.5” 40.0 lbs

Bullnose 2-wire

Short Flange

2.5” x 2.5” 49.4 lbs

2.5” x 1.5” 48.0 lbs

Short Flange BN ( 7 /

8

”) 2.5” x 1.5” 40.0 lbs

Galvanized Hanger and Tie Wire

are used to support CRC gridwork for stucco and acoustical or drywall ceilings. Hanger wire is produced in #8, #9 and #12 gauge galvanized soft annealed steel in 12’ lengths. Tie wire is produced in #16 and #18 gauge galvanized soft annealed steel in 28” lengths.

Product

Hanger Wire

Tie Wire gauges

8, 9, 12

16, 18

Length Weight/package

12’ 50 lb. hanks

28” 25 lb. hanks

Galvanized Cold Rolled Channel

is used to form suspended ceiling grids for lath and plaster applications and for horizontal bridging in steel framing.

Pieces/ Weight/ Weight/ Weight/ Weight/ bundle 16’ piece 20’ piece bundle (16’) bundle (20’)

3/4” 20 4.9 lbs. 6.1 lbs. 98 lbs. 122 lbs.

1 1/2” 20 7.7 lbs. 9.6 lbs. 154 lbs. 192 lbs.

14


stainless steel

Alloy SS304

provides excellent corrosion resistance for specialty lath applications.

SS304 Lath can be used over sheathing boards to carry conventional stucco/stone finishes and for external insulation requirements. SS304 Lath is used in coastal environments, near water, where underspray, fireproofing or corrosion protection is desired. Produced both flat and selffurred (Dimpled).

Alloy SS316

is used for extreme corrosive environments, around chlorine or pool splashzones or construction of rock and water formations. It is also a good choice for water and wastewater treatment facilities, high-temperature installations and petrochemical fireproofing.

Produced both flat and self-furred (Dimpled).

Weight/sq. yard

1.75 lbs.

2.5 lbs.

3.4 lbs.

Alloy Sheet weight

304 or 316 approx. 3.5 lbs.

304 or 316 approx. 5.00 lbs.

304 or 316 approx. 6.80 lbs.

Nominal sheet size Sheets/bundle

27” x 97” 10

27” x 97”

27” x 97”

10

10

Stainless Steel Lath is not in all AMICO distribution centers. Contact AMICO for availability and shipping.

secura lath

® spec data

Finish

Pre-Galvanized

Section 09 22 00

Secura Lath Ceiling Penetration

Barrier Meets “Buy American”

Procurement

Sheet Size

Panel Weight Per

Size Sq. Ft.

27” x 97” 18.2 sq. ft. .83 lbs.

Part 2 Products

2.1 MANUFACTURER

A. Physical penetration barrier for plaster applications shall conform to ASL .50-16R as manufactured and specified by

Alabama Metal Industries Corporation (AMICO),

Birmingham, AL; Telephone 205/783-9515; www.amicosecurityproducts.com/lath.htm

2.2 MATERIALS

A. The security lathing system shall comply with AMICO ASL

.50-16R Secura Lath.

Part 1 General


A. Supply and install all materials required for a complete in-place security lath structural base for Portland cement stucco or high strength gypsum plaster and all complimentary accessories.

1.3 REFERENCES

A. ASTM A1011 Standard Specification for Steel

B. ASTM F1267 Standard Specification for Metal,

Expanded, Steel

C. AMICO Secura Lath Installation Guidelines

1.4 QUALITY ASSURANCE

A. The contractor must have documented experience with the construction methods involved with plaster and stucco installations on ceilings.

2.3 FINISH

A. Pre-Galvanized Finish – for standard installations lathing mesh shall be pregalvanized prior to expanding and the factory applied paper backing.

B. Perforated Kraft paper shall be vinyl coated one side and factory attached to the metal lathing.


3.1 INSTALLATION

A. Installation and lay-out of the job shall be approved by the owner or general contractor prior to installation.

B. Recommended perimeter detailing for intersections can be found on AMICO’s website.


15

security mesh tm system

AMICO Security Mesh

TM

is a steel mesh panel used as a penetration barrier behind drywall finishes. Security

Mesh (ASM) is attached to metal or wood framing members in walls and ceilings using AMICO Secura Clips TM in lieu of washers or welding to stud framing.

ASM .50-13F

Maximum Security

ASM .75-9F

Maximum Security

Specified and Approved by Federal Agencies for new and retrofit applications.

AMICO

Security Mesh

ASM .50-13F

ASM .75-9F

ASM .75-13F

ASM 1.5-9F

Weight per sq. ft.

1.40 lbs.

1.71 lbs.

.75 lbs.

1.11 lbs.

ASM 1.0-16F* .41 lbs.

ASM .75-9F (Max) 2.38 lbs.

Overall

Thickness Open Area

.070”

.120”

.070”

.110”

.048”

.140”

Percent

57%

63%

73%

77%

77%

63%

Tolerances: SWD = 0 + 1/4" per foot of dimension

LWD = 0 + 1/4" per foot of dimension

Stock sizes: 4' x 8'

4' x 10'

5' x 8'

5' x 10'

6' x 8'

6' x 10'

*4' x 8' panels only

ASM .75-13F

Medium Security

ASM 1.5-9F

Medium Security

AMICO Secura Clips

TM

make any installation more secure by improving the holding power over standard drywall screws by 68%. Attach clips at a minimum of 12” on center per framing member. Panels may be staggered or butted, but must join on a framing member. Secura Clips are shipped 300 clips per carton. (You will need 24 clips per 4’ x 8’ ASM panel.)

ASM 1.0-16F

Minimum Security

ASM .75-9F heavy Modified

Super Max Security for

Industrial and Homeland

Security applications

Panels Butted and Staggered

Panels Butted

16


security mesh tm specification

Section 09 29 00

Drywall Penetration Barrier

Security Mesh

Meets “Buy American” Procurement

Part 1 General


A. Supply and install steel expanded metal panels as a penetration barrier behind gypsum [wall] and or [ceilings] using the Secura Clips.

1.2 SYSTEM DESCRIPTION

A. Security Mesh shall be made from a sheet of steel that is simultaneously slit and stretched into a rigid, open mesh diamond making one continuous sheet that cannot unravel. The finished shape of the mesh openings shall be a flattened diamond. Conventional expanded metal not manufactured specifically for security purposes is NOT acceptable for this use.

1.3 REFERENCES

A. ASTM A1011 Standard Specification for Steel, Sheet and

Strip, Hot-Rolled, Carbon, Structural, High Strength Low

Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength

B. ASTM F1267 Standard Specification for Metal, Expanded,

Steel

C. ASTM A123 Standard Specification for Zinc (Hot-Dip

Galvanized) Coatings on Iron and Steel Products

1.4 QUALITY ASSURANCE

A. Materials shall meet the requirements of “Buy American” domestic requirements.

1.5 SUBMITTAL

A. Letter Underwriters Laboratories Fire Rated Assembles letter; (per U/L subject File #1857). The use of Security Mesh will not jeopardize a fire rated assembly.

1.6 STORAGE AND HANDLING

A. Materials shall be protected from damage by weather, vandalism, and theft.

Part 2 Products

2.1 MANUFACTURER

A. The behind the drywall penetration barrier system shall conform to Security Mesh™ for installation in [walls] [and]

[ceilings] using Secura Clips as manufactured by ALABAMA

METAL INDUSTRIES CORPORATION, (AMICO), 3245 Fayette

Avenue; Birmingham, AL 35208; Telephone 205/783-9515.

2.2 PANEL STYLE - Select and delete unused styles

A. Maximum Security - ASM .75–9F, ASM .50–13F, and

ASM .75–9F Heavy

B. Medium Security - ASM 1.5–9F and ASM .75-13F

C. Minimum Security - ASM .75–16F and ASM 1.0–16F

2.3 AMICO SECURA CLIPS

A. Security Mesh shall be attached to framing members using

AMICO Secura Clips and the appropriate threaded fasteners.

B. For steel framing install a flat head bugle type self-tapping fine thread screw long enough to penetrate the framing member a minimum of 3/8-inch.

C. For wood framing applications install a 1-5/8-inch fine thread drywall screw allowing the fastener to penetrate the framing member at least 1-1/4 inches.

D. Secura Clip spacing shall be a minimum of [12] [6] inches vertically per framing member.

E. In ceiling applications Secura Clips shall be spaced a minimum of [12] [6] inches along ceiling joists.

2.4 FINISH

A. Security Mesh is supplied “mill finish” HR P&O.

B. Security Mesh with hot dip galvanized finish.


3.1 PREPARATION

A. Installation and layout of the job shall be approved by the owner or general contractor prior to installation.

B. It is recommended framing members be no less than 20GA.

3.2 INSTALLATION

A. Security Mesh panels may be installed with diamonds running in either direction.

B. Panels are flattened by a rolling process and panels are not square. Manufacturing tolerances are to be considered.

C. AMICO Secura Clips shall be installed to secure the mesh to the framing members prior to the installation of drywall finish.

D. Mesh joints occurring on framing members may either join staggered or butt together. It is acceptable to overlap mesh joints with owner’s approval.

E. Panels shall join, begin and terminate on a framing member.

Panels not joining on framing member shall be wire tied with 18GA steel tie wire. Wire tying shall be no less frequent than the installation of Secura Clips.

3.3 CLEANING

A. The contractor shall be responsible to clean up the jobsite of any unused materials and trash.


17

Manufacturing & Distribution:

Birmingham, AL

800-366-2642 fax 205-780-7838

Fontana, CA

800-962-0100 fax 909-822-8135

Denver, CO

800-962-0100 fax 909-822-8135

Wilmington, De

800-476-4430 fax 302-429-9126

Lakeland, FL

800-487-2511 fax 863-688-2242

Chicago, IL

800-238-0322 fax 815-932-4557 greenville, SC

800-476-4430 fax 864-458-7245 houston, TX

800-433-9945 fax 713-921-5636

Orem, UT

800-645-0340 fax 801-226-3066

Seattle, WA

800-859-5363 fax 253-872-5676

Montreal, Canada

800-361-0009 fax 514-648-4731

Toronto, Canada

800-663-4474 fax 905-335-5682

Vancouver, Canada

800-665-4474 fax 604-607-5075

E M L A

Expanded Metal Lath Association

Visit www.amico-lath.com to view or download data sheets, request a catalog, request

LEED information or find an AMICO representative to contact for technical assistance.


12/2012 - 3,000