INSTALLATION
INSTRUCTIONS
FOR
HOMASOTE EASY-PLY®
ROOF DECKING-THERMASOTE®
ROOF INSULATION SYSTEM |
SYSTEM DESCRIPTION
This system consists of an application of EASY-PLY
ROOF DECKING plus a subsequent application of
THERMASOTE Nail Base roof insulation.
EASY-PLY ROOF DECKING is made of various plies
of high density Homasote structural building board
laminated together to form structural roof panels.
THERMASOTE is a composite of a layer of nail base
Homasote plus polyisocyanurate foam with a fiberglass
felt facer. |
FINISH
Easy-Ply®Roof Decking has a 6 mil refinished surface of a decorative white "Flitter" vinyl film which serves both as interior finish and a vapor
barrier. Not recommended over swimming pools or similar areas.
Decking is also available natural gray for non vapor barrier application.
GENERAL REQUIREMENTS
Keep wrapped in weather-capped shipping units until ready for use. Protect open units with polyfilm. Roof decking must be installed in
a dry condition only; follow installation immediately with application of roofing felt. Wet decking must be allowed to dry thoroughly before
applying finish roofing materials.
Where Roof Decking will be secured with nails, use size and quantities recommended in the "Application Recommendations."
Edges of all cuts made for fitting, clearance holes or other openings should be primed with a quality primer- sealer and caulked. Fill open
areas with approved insulation at ridge, around chimneys, vents or other projections. Cap the ridge and flash other openings according to
normal roofing practice and local code requirements.
Provide a gap of 1/8" between squared end butt joints and caulk joints. Trim panel length if necessary to provide gap. Stagger all end joints.
PREFAB ROOF TRUSSES
Apply wood purlins, of sufficient strength for rafter span, securely across rafter trusses. Space purlins according to the thickness of the Roof
Decking to be used as recommended in the"Rafter Spacing" chart. Starting at low point of roof, position Roof Decking panels across wood
purlins with long edges 90º to purlins. Stagger butt joints on alternate purlins. Use a cut-off piece of Roof Decking and a heavy hammer to
drive T & G edges tight.
A-FRAME & POST & BEAM STRUCTURES
Easy-Ply Roof Decking is an economical, labor-saving roof sheathing, particularly ideal for these types of buildings; a weather-resistant
structural decking that provides a decorative, vapor-barrier film for completely pre-finished ceiling as well as a base for THERMASOTE
nail-base supplemental roof insulation and/or wide variety of finish roofing materials. To protect finished Roof Decking for exposed beam
structures, it is recommended that polyethylene film be applied to beam tops before installing Roof Decking. See illustration #3, page 3. After
staining or painting the beams, the polyethylene film can be removed by slitting each side of the beam. If beams are stained or painted before
installing Roof Decking, wipe beam tops clean to protect Roof Decking finish.
Use appropriate thickness of Roof Decking to meet rafter span requirements as shown in the "Rafter Spacing" chart. Install Roof Decking
panels with long edges at right angles to rafters, starting at low point of framing, with tongue of T & G pointing to ridge and finish (ceiling) side
down on rafters. Start second and following courses on alternate rafters to stagger end joints. Use a cut-off piece of Roof Decking
and a heavy hammer to drive T & G edges tight. Allow 1/8" gap at butt joints and caulk as illustrated.
Panel ends must not project beyond framing at roof edges. If decking is used as overhang, it must be supported at all outside edges and/or
ends with additional framing members.
