Roofing Membrane R Value

The higher the r value the better a material performs as a thermal insulator.

Roofing membrane r value.

Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. Extruded expanded polystyrene insulation is. Both types have an r value ranging from 4 r to 6 r per 1 inch of insulation thickness. The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material.

Superior performance at a cost effective price. For new roof construction isoboards faced polyisocyanurate insulation are generally used because of their high r value fire resistance and light weight. 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. Types of roof insulation.

The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. The amount shown is an average amount used for roof system r value calculations. Roof membrane available in 40 50 and 60 mil 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.

The membrane is attached using 12 o c. 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. Crest energy savings calculator. Quite the contrary in colder regions ashrae zones 4 through 8.

See your potential. Excellent long term heat and uv resistance. Always check with your local code authority. The average r value for some common roof materials include.

Pattern with perimeter sheets attached 6 o c. Single ply roofing information. 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. Highly reflective and emissive white roof can help reduce energy costs and urban heat island effect.

For white and black membranes the table outlines the necessary adjustments in r values to maintain a roof assembly s energy performance. To calculate the r value of a roof system your contractor will take into account the underlayment coverboards adhesives insulation and even the membrane. R value is used as a measurement of the effectiveness of thermal insulating materials. R value table for roofing materials and building insulation.