Eps can be used for ground contact and does not retain water over time.
Rubber roof membrane r value.
Smooth tpo fleece back tpo self adhered tpo tpo colors extreme tpo.
After it ages a few months the r value will reduce to somewhere.
Xps is semipermeable with a perm rating of 1.
You should of course see the manufacturer provided technical data sheet for the r value of specific products.
For a 1 inch board equivalent of 6 r value.
For example while optimum performance using a black membrane the assembly must utilize insulation with an r value of 29.
For a very good introductory overview article on r value see r values over at the website of.
Extruded expanded polystyrene insulation is commonly used in inverted roof membrane assemblies irma.
For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721.
It is top quality and the most cost effective product for your flat roof.
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.
Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.
The average cost of extruded polystyrene insulation is 0 42 sq ft.
Quite the contrary in colder regions ashrae zones 4 through 8.
For a 1 in thick panel.
To convert rsi to r value multiply the rsi by 5 67826.
Gaf tpo roofing membranes include.
The amount shown is an average amount used for roof system r value calculations.
You can expect to pay about 55 100 sq ft.
Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed.
For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance.
R value of various materials.
While expensive the best insulation is polyiso rigid foam.
Pattern with perimeter sheets attached 6 o c.
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.
We recommend having at least 20 r value worth of material for optimal energy efficiency.
Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness.
