Roof Membrane R Value

5 x 100 128 lbs.

Roof membrane r value.

R oll s ize n ote. Always check with your local code authority. The membrane is attached using 12 o c. Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed.

Single ply roofing information. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. 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 value is being calculated for the purpose of satisfying energy code requirements. Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness.

1 000 sq ft 500 sq ft. The amount shown is an average amount used for roof system r value calculations. What are common r values. For example while optimum performance using a black membrane the assembly must utilize insulation with an r value of 29.

R value is calculated by more than just the insulation. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. The average r value for some common roof materials include. Roof membrane available in 40 50 and 60 mil thickness.

For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance. Extruded expanded polystyrene insulation is commonly used in inverted roof membrane assemblies irma. A u value incorporates the total system approach to insulation design. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

For a very good introductory overview article on r value see r values over at the website of. Quite the contrary in colder regions ashrae zones 4 through 8. The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. P roduct sizes dim ensions and w idths are nom inal values and are subject to norm al m anufacturing packaging tolerance and variation c olors f u ll r oll s ize f u ll r oll w eigh t h alf r oll s ize h alf r oll w eigh t w hite t an g ray 10 x 100 256 lbs.

Pattern with perimeter sheets attached 6 o c. Gaf analyzed membrane samples from roofs across the us and studied thickness over scrim surface cracking and the ability to repair aging tpo membranes. 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. A recent study of everguard tpo roofs installed between 8 and 16 years ago found they all performed above astm standards for newly manufactured tpo.