Flat Roof Foam Board

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.

Flat roof foam board. The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Cost of rigid foam board insulation. Retroplus roof board is an expanded perlite mineral aggregate board. 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.

It accounts for over 60 of all installs. Rigid roof insulation board. Use a premade kit for this type of project. Attach to deck board.

Foam control plus and foam control flat roof insulation are recognized for use in direct to deck applications. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens. 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. Ul evaluation report er11812 01 and ul roof deck construction no.

Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks. This material costs less than other rigid foam boards but still offers an r value of 3 6 to 4 2 per inch. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. 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.

Iso is available in a range of thicknesses that come in increments of 1 inch. Rigid foam is produced in various size panels 4 ft x 8 ft 4ft x 4ft etc. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. Usually homeowners spend about 25 of the total cost to install a flat roof on high quality insulation.

This will create ventilation and separation between attic roof substate and the roof itself. Attach the tongue and groove insulation boards to the concrete wall with adhesive. Run vertical 2 3 boards battens over roof sheething 16 o c. With this kind of roof the insulation follows the slope of the roof.

How to improve insulation levels of flat roofs. For new construction use rigid boards to insulate slabs and the outside of foundation walls. For a basement remodeling project consider insulating basement walls with 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.

The most efficient and best insulation used is rigid foam polyiso.