Roof Membrane R Value

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.

Roof membrane r value.

The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Roof membrane available in 40 50 and 60 mil thickness. Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness.

A u value incorporates the total system approach to insulation design. R value of various materials. Always check with your local code authority. 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. Pattern with perimeter sheets attached 6 o c. Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed. To calculate the r value of a roof system your contractor will take into account the underlayment coverboards adhesives insulation and even the membrane.

For a very good introductory overview article on r value see r values over at the website of. Single ply roofing information. 5 x 100 128 lbs. What are common r values.

The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. R value is calculated by more than just the insulation. Extruded expanded polystyrene insulation is commonly used in inverted roof membrane assemblies irma. Duro last 50 mil membrane is manufactured with 28 mil of thickness on the top performance layer far exceeding industry standards as well as competitor systems with equal and even greater mil values.

1 000 sq ft 500 sq ft. Quite the contrary in colder regions ashrae zones 4 through 8. The amount shown is an average amount used for roof system r value calculations. Gaf analyzed membrane samples from roofs across the us and studied thickness over scrim surface cracking and the ability to repair aging tpo membranes.

For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance. 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. The membrane is attached using 12 o c. For example while optimum performance using a black membrane the assembly must utilize insulation with an r value of 29.