Flat Roof Foam Board

How to improve insulation levels of flat roofs.

Flat roof foam board.

After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on your roof. 458 recognize foam control plus 150 up to 6 7 and foam control 100 up to 10 being installed directly over steel roof decks along with a class a b or. For new construction use rigid boards to insulate slabs and the outside of foundation walls. Run vertical 2 3 boards battens over roof sheething 16 o c.

Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Foam control plus and foam control flat roof insulation are recognized for use in direct to deck applications. Ul evaluation report er11812 01 and ul roof deck construction no. Foam board insulation ideas.

Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to retroplus roof board on one side and a glass reinforced facer on the other. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks. The most efficient and best insulation used is rigid foam polyiso. 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.

Attach to deck board. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens. With this kind of roof the insulation follows the slope of the roof. Insulated roof assemblies can be vented or unvented.

Cost of rigid foam board insulation. The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Attach the tongue and groove insulation boards to the concrete wall with adhesive. Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation.

For a basement remodeling project consider insulating basement walls with foam board. This material costs less than other rigid foam boards but still offers an r value of 3 6 to 4 2 per inch. It accounts for over 60 of all installs. There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam.

Iso is available in a range of thicknesses that come in increments of 1 inch. Use a premade kit for this type of project. Rigid roof insulation board. Retroplus roof board is an expanded perlite mineral aggregate board.

This will create ventilation and separation between attic roof substate and the roof itself.