Green Roof Assembly R Value

Unlike conventional earth covered structures garden roof assemblies are lightweight and can be installed on a wide variety of new and existing structures.

Green roof assembly r value.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. However a green roof does not provide additional insulation. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The branz house insulation guide provides construction r values for common construction types.

In an uninsulated house more heat is lost through the ceiling and roof than any other part of the house making the roof the top priority for insulation. Garden roof assembly hydrotech s garden roof assemblies combine the proven performance of our monolithic membrane 6125 roofing waterproofing with proven green technology. Insulation thermal resistant r value requirements for the building should be integral to the roof membrane assembly below the vegetated roof components. For a very good introductory overview article on r value see r values over at the website of.

Every construction design architect engineer a e knows a material s r value is an important factor when specifying insulation products with many regulations requiring minimum values for wall ceiling and roof assemblies. As we said before the r value measures the thermal resistance of a material. What r value do i need. Pitched timber framed roof r 3 3.

Determining insulation r value accuracy. You can find some of the examples here. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Extruded expanded polystyrene insulation is commonly used in inverted roof membrane assemblies irma.

For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. Sprayed polyurethane foam spf will have an r value of 7 14 when it is newly installed. Completely dry growing media the dirt of the green roof so to speak has a minimal r value typically about 0 5 inch. Adversely u value measures the rate of heat transfer.

Plants need water to grow so the green roof is designed to retain some degree of moisture. Knowing what r value and u values mean is key to following energy codes and to selecting products that best suit the climate zone you are building in. R value of various materials. The amount shown is an average amount used for roof system r value calculations.

Replacing the impervious surface of a conventional roof with.