Installation Over Plywood or OSB

Installation Over Plywood or OSB
Installation Over Plywood or OSB
PREPARATION: All surfaces to be covered must be structurally sound, clean and free of dust, oil, grease, curing compounds, sealers,
waxes, paints, loose or scaly materials and other foreign matter. Check for any protruding nails, screws or other objects and level off with
the surface or remove. In addition to the substrate condition, check the RPM mats to ensure the mats are free of oils, dust or any other
foreign matter that could hinder adhesion. During the installation of the RPM mats, DO NOT use a ground level halogen lamp as a light
source! The heat generated from this form of lighting at close range far exceeds the temperature the electric heat wire produces. Avoid
exposing RPM mats to extreme hot weather/temperatures or prolonged direct sun exposure. Any of these types of exposure could cause
the mats to warp.
RPM INSTALLATION: Do a quick layout of RPM mats in the area to be installed. This will give a layout for cuts prior to applying the
adhesive on the substrate. Use a utility knife or scissors to cut the RPM mats. If using a utility knife only a light score and snap is required.
Apply Roberts 2001 Sheet Good Adhesive or other RPM approved adhesive to substrate using a 1/8” x 1/8” V-Notch trowel. Apply an even
coat over the section the RPM mats will be installed. Keep a bucket of water and a sponge nearby to periodically clean the trowel of excess
build up of adhesive. This will keep the notches on the trowel clean and the adhesive spread rate even throughout the installation. Install
several mats prior to stapling. This will allow for the re-adjustment of the mats if necessary to ensure the studs on the RPM mats are in the
desired position. Be sure to butt the sheets together, do not overlap them. Next, using the Porter Cable Model # US58 Pneumatic Upholstery
Stapler (or equivalent) and 3/8” x 1/2” Galvanized Upholstery Staples, or a 1/4” Narrow Crown Stapler with depth control and 1/4” x 1/2”
to 3/4” Galvanized Crown Staples, staple the RPM every 4” to 6” in the field of the mats, along the perimeter of the mats every 4”, and the
corners as well. Spacing of the staples is dependent upon a couple of factors. The first, is the condition of the substrate. The poorer the
substrate condition, the more staples will be needed. The second, is how soon after the installation of the RPM mats will the electric heat
wire be installed. If the electric heat wire is going to be installed before the glue sets (approx. 24 hrs) the spacing of the staples will need to
be closer (approx. 4”). This will keep the RPM mats in place when applying tension to the studs on the RPM mats during the installation of
the heat wire. WAIT 24 HOURS BEFORE APPLYING THE CEMENT MORTAR INTO THE RPM MAT, this will allow the vinyl
adhesive to set. The reason for waiting is if the mortar is applied prior to the drying of the adhesive the shrinkage/curing of the mortar could
cause the RPM Mats to pull out of the adhesive.
HEAT WIRE INSTALLATION: Remove the spool of wire from the box. With an ohm tester, do a continuity test on the wire prior to
installation. Follow the manufacturer’s recommendations for testing the wire. Determine the start point of the wire in the floor. Begin
by taking the splice connection of the heat wire (in most cases the heat shrink section between the cold lead and the heat wire) and lay it
between the studs of the RPM mat. Next, using hot glue attach this section to the RPM mat. Make sure the cold lead lays flat in between
the studs so it does not rise above the surface of the mat (on the RPM-330 you may need to chisel a section down into the substrate to get
the cold lead section below the surface of the RPM-330 mats). Next, begin uncoiling the wire from the spool and lay it between the studs
of the RPM mats. When an area is reached where the direction of the wire needs to change, wrap the wire around the stud and use an RPM
grommet to hold the wire down. The stud spacing on the RPM mats is configured to space the wire at 2”, 2.5”, 3” or any spacing desired.
Follow the manufacturer’s recommendation for minimum and maximum spacing requirements. Refer to the “RPM Mat Wire Spacing
Chart” to see how the wire needs to be laid to achieve the various spacing. If multiple wires are to be installed, be sure to leave sections of
the RPM mats clear of heat wire to make it available for other heat wires. When the end of the wire is reached, hot glue the end splice to
the RPM mat. Do not zigzag the end splice between the studs, hot glue the end splice straight with no bends.
MORTAR INSTALLATION: Check the RPM mats to ensure the surface is free of oils, dust or any other foreign matter that could hinder
adhesion. Begin by using a RPM approved bonding agent. Follow the manufacturer’s recommendation for use. The fastest and easiest way
to apply the bonding agent is to use a sprayer. Spray over the entire surface of the RPM mats. Be sure to apply the bonding agent to all sides
of the studs on the RPM mats. Wipe down any excessive or puddle areas of the bonding agent. Follow the manufacturer’s recommendation
for tack time for the bonding agent. Once the bonding agent has tacked up, begin installing a cementitious floor leveler and use the surface
of the RPM mats to screed the floor leveler smooth. Allow the leveling product ample time to dry before setting tile to the surface. DO
NOT TURN ON THE ELECTRIC HEAT WIRE FOR 28 DAYS AFTER COMPLETION. This could accelerate the cure time of the
leveling product, thinset or tile grout, which could cause them to lose some of their adhesive qualities or get shrinkage cracks in the grout.
MATERIAL COVERAGE: (Note: all coverage is approximate)
* Roberts 2001 Sheet Good Adhesive: 60 s/f per gal * Porter Cable US12G Staples: 600 s/f per box
* RPM Mats: 1 sheet = 6.11 s/f
* RPM Grommets: 50-100 s/f per bag depending on qty of wire turns
* Bonding Agent: See Manufacturer’s Coverage
* Cementitious Leveler: RPM-330 = 2.13 lbs per s/f / RPM-500 = 3.4 lbs per s/f
In-Floor Heat Wire System
Additional Recommended Installation Products
Adhesives for Plywood/OSB Surfaces:
• RPM to Plywood / OSB: Roberts® 2001 Felt-Back Sheet Vinyl Adhesive
• RPM to Plywood / OSB: Just about any brand name, high quality felt-back sheet vinyl adhesive
(contact RPM Radiant Corp for assistance and/or approval)
• RPM to Plywood / OSB: Henrys® 356 Felt-Back Sheet Vinyl Adhesive
Adhesives for Concrete Surfaces:
• RPM to Concrete: Bostik® Hydroment Ultra-Set Advanced (contact RPM Radiant for assistance in
locating a potential stocking distributor in your area)
• RPM to Concrete: Roberts® 3300 Max Performance (note: follow Roberts recommended
installation method)
• Cement Leveler to RPM Surface: Customs® LevelQuik Self Leveling Underlayment (tip: use less
water per bag than recommended for a more trowelable consistency)
• Cement Leveler to RPM Surface: Laticrete® Floor Leveling Mortar
• Cement Leveler Bonding Agent to RPM Surface: Laticrete® Floor Leveling Admix & Primer
• Cement Leveler Bonding Agent to RPM Surface: Customs® LevelQuik Primer
• Cement Leveler to RPM Surface: Other brands are available (contact RPM Radiant for assistance)
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