Flat Roof Foam Board

For new construction use rigid boards to insulate slabs and the outside of foundation walls.

Flat roof foam board.

Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation. Rigid roof insulation board. For a basement remodeling project consider insulating basement walls with foam board. Use a premade kit for this type of project.

Iso is available in a range of thicknesses that come in increments of 1 inch. After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on your roof. The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks.

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. This will create ventilation and separation between attic roof substate and the roof itself. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies.

Foam board insulation ideas. Rigid foam is produced in various size panels 4 ft x 8 ft 4ft x 4ft etc. Run vertical 2 3 boards battens over roof sheething 16 o c. Ul evaluation report er11812 01 and ul roof deck construction no.

Cost of rigid foam board insulation. Insulated roof assemblies can be vented or unvented. 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. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

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

How to improve insulation levels of flat roofs. 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. Retroplus roof board is an expanded perlite mineral aggregate board. It accounts for over 60 of all installs.

This material costs less than other rigid foam boards but still offers an r value of 3 6 to 4 2 per inch.