Flat Roof Insulation Board With Plywood

Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.

Flat roof insulation board with plywood.

Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced. Lay the boards with the plywood side uppermost and stagger board joints. It s light weight provides ease of handling. Celotex td4000 comprises a polyisocyanurate rigid foam insulation core with a thermal conductivity of 0 022 w mk and low emissivity aluminium foil facings on both sides bonded to a layer of 5 5mm wbp exterior grade plywood.

Fix celotex td4000 with corrosion proof suretwist composite panel helical fasteners at a frequency to suit the design wind load. 3 benefits of rigid foam sheathing. The most efficient and best insulation used is rigid foam polyiso. This will create ventilation and separation between attic roof substate and the roof itself.

Rigid roof insulation board. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Leave a gap of approximately 2mm between boards and ensure a minimum 20mm bearing on joists and noggings. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens.

A new fixing for securing structural 6 mm plywood composite insulation. Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1 2 thick duraboard an expanded perlite mineral aggregate board on one side and a fiber glass reinforced facer on the other. It accounts for over 60 of all installs. Both products will swell when wet but plywood will return to almost its exact shape when it dries.

Iso is available in a range of thicknesses that come in increments of 1 inch. 135mm helical flat roof fixings for warm roofs. Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation. 16 20 fixings needed per 1200x2400mm board depending on rafter spacing applicationhammer driven fixing for securing structural 6mm plywood composite insulation board to flat roofs.

Plywood will absorb moisture quicker than osb but consequently it will also dry quicker. Cost of rigid foam board insulation. Osb is less forgiving of being left out in the rain and will show more deformities after a wetting and drying cycle.