Rubber Roof Membrane R Value

Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness. The average cost of extruded polystyrene insulation is 0 42 sq ft. After it ages a few months the r value will reduce to somewhere.

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The average r value is r 5.

Rubber roof membrane r value.

For a 1 inch board equivalent of 6 r value. Eps can be used for ground contact and does not retain water over time. For a very good introductory overview article on r value see r values over at the website of. Expanded polystyrene eps with the highest r value per dollar eps is used for roof wall and floor insulation.

Quite the contrary in colder regions ashrae zones 4 through 8. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Gaf tpo roofing membranes include. You can expect to pay about 55 100 sq ft.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. For a 1 in thick panel. For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance. Smooth tpo fleece back tpo self adhered tpo tpo colors extreme tpo.

The amount shown is an average amount used for roof system r value calculations. To convert rsi to r value multiply the rsi by 5 67826. R value of various materials. Xps is semipermeable with a perm rating of 1.

Extruded expanded polystyrene insulation is commonly used in inverted roof membrane assemblies irma. Pattern with perimeter sheets attached 6 o c. It is top quality and the most cost effective product for your flat roof. For example while optimum performance using a black membrane the assembly must utilize insulation with an r value of 29.

While expensive the best insulation is polyiso rigid foam. Mechanically attached installation uses heavy duty screws and barbed plates to hold the membrane down tightly and is not affected by possible iso de lamination. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed.

The membrane is attached using 12 o c. Please note that the r values for roof membranes shingles tiles air films and roof deck materials might or might not be permitted by your local code to be included when total roof assembly r. We recommend having at least 20 r value worth of material for optimal energy efficiency.