Metal Roof R Value

R value of various materials.

Metal roof r value.

Additionally you ll recoup an average of 85 9 percent of. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Energy efficiency is a totally different consideration when it comes to roof material selection. The amount shown is an average amount used for roof system r value calculations.

Both metal and asphalt roofs are most commonly directly exposed to the sun and as a result both absorb and release heat. R value of building materials material r inch r thick ness fiberglass inch 3 00. For a very good introductory overview article on r value see r values over at the website of. Labor itself averages 300 to 500 per square and 4 500 7 500 for a 1 500 square foot roof.

Recommended home insulation r values. Rsi r value système international is the metric equivalent. Roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

Metal insulating 2 inch w urethane 15 00 air films interior ceiling 0 61 interior wall 0 68. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. The r values of both metal roofing and asphalt shingles are negligible but this is not to be confused with energy efficiency. Hunter panels energy smart polyiso h metal roofing supply standing seam metal roof systems modified bitumen systems built up roofing.

R value is a measure of insulation s ability to resist heat traveling through it. In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. You should of course see the manufacturer provided technical data sheet for the r value of specific products. To convert rsi to r value multiply the rsi by 5 67826.

R value is used in the united states. Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. Based on astm c518 calculation method the door has an r value of up to 11 but using astm c1363 tested operable the same door only have an r value of up to 3 5. Metal roofs cost an average of 4 500 to 11 500 including installation and materials.

The higher the r value the better the thermal performance of the insulation. Extruded expanded polystyrene insulation is.