Roofing Membrane R Value

To calculate the r value of a roof system your contractor will take into account the underlayment coverboards adhesives insulation and even the membrane.

Roofing membrane r value.

Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness. The rosemont il based national roofing contractors association nrca recommends that cover boards be used of perlite gypsum board or mineral wool to avoid possible blistering. Excellent long term heat and uv resistance. The higher the r value the better a material performs as a thermal insulator.

R value table for roofing materials and building insulation. For new roof construction isoboards faced polyisocyanurate insulation are generally used because of their high r value fire resistance and light weight. The amount shown is an average amount used for roof system r value calculations. For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance.

Highly reflective and emissive white roof can help reduce energy costs and urban heat island effect. 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. Single ply roofing information. 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.

Always check with your local code authority. Extruded expanded polystyrene insulation is. The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. Types of roof insulation.

Pattern with perimeter sheets attached 6 o c. For example while optimum performance using a black membrane the assembly must utilize insulation with an r value of 29. The membrane is attached using 12 o c. Heat welded seams provide greater seam strength to taped and other seams.

Superior performance at a cost effective price. Roof membrane available in 40 50 and 60 mil thickness. Quite the contrary in colder regions ashrae zones 4 through 8. R value is used as a measurement of the effectiveness of thermal insulating materials.

The average r value for some common roof materials include. A u value incorporates the total system approach to insulation design. Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems.