Flat Roof Foam Board

For a basement remodeling project consider insulating basement walls with foam board.

Flat roof foam board.

Rigid roof insulation board. Cost of rigid foam board insulation. 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. Run vertical 2 3 boards battens over roof sheething 16 o c.

Iso is available in a range of thicknesses that come in increments of 1 inch. 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. With this kind of roof the insulation follows the slope of the roof.

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. How to improve insulation levels of flat roofs. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens. Attach the tongue and groove insulation boards to the concrete wall with adhesive.

However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. Rigid foam is produced in various size panels 4 ft x 8 ft 4ft x 4ft etc. The most efficient and best insulation used is rigid foam polyiso. Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation.

Foam control plus and foam control flat roof insulation are recognized for use in direct to deck applications. Attach to deck board. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. This material costs less than other rigid foam boards but still offers an r value of 3 6 to 4 2 per inch.

This will create ventilation and separation between attic roof substate and the roof itself. 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. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

It accounts for over 60 of all installs. Use a premade kit for this type of project. Insulated roof assemblies can be vented or unvented. Retroplus roof board is an expanded perlite mineral aggregate board.

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.