Roof Membrane R Value

1 000 sq ft 500 sq ft.

Roof membrane r value.

R value is calculated by more than just the insulation. You should of course see the manufacturer provided technical data sheet for the r value of specific products. What are common r values. Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness.

R oll s ize n ote. R value of various materials. Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed. Roof membrane available in 40 50 and 60 mil thickness.

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. The average r value for some common roof materials include. Always check with your local code authority. 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.

For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance. The membrane is attached using 12 o c. 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. 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.

5 x 100 128 lbs. Quite the contrary in colder regions ashrae zones 4 through 8. A u value incorporates the total system approach to insulation design. Single ply roofing information.

The amount shown is an average amount used for roof system r value calculations. For a very good introductory overview article on r value see r values over at the website of. The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

To calculate the r value of a roof system your contractor will take into account the underlayment coverboards adhesives insulation and even the membrane. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. 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.