Flat Roof Insulation Board With Plywood

Leave a gap of approximately 2mm between boards and ensure a minimum 20mm bearing on joists and noggings.

Flat roof insulation board with plywood.

Rigid roof insulation board. 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. 126mm celotex td4000 pir flat roof insulation board with plywood. Both products will swell when wet but plywood will return to almost its exact shape when it dries.

Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation. It accounts for over 60 of all installs. 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. A new fixing for securing structural 6 mm plywood composite insulation.

Iso is available in a range of thicknesses that come in increments of 1 inch. Lay the boards with the plywood side uppermost and stagger board joints. Run vertical 2 3 boards battens over roof sheething 16 o c. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens.

Plywood will absorb moisture quicker than osb but consequently it will also dry quicker. 3 benefits of rigid foam sheathing. This will create ventilation and separation between attic roof substate and the roof itself. Fix celotex td4000 with corrosion proof suretwist composite panel helical fasteners at a frequency to suit the design wind load.

Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. It s light weight provides ease of handling. 135mm helical flat roof fixings for warm roofs. 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.

Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. The most efficient and best insulation used is rigid foam polyiso. Osb is less forgiving of being left out in the rain and will show more deformities after a wetting and drying cycle.