Metal Roof R Value

Both metal and asphalt roofs are most commonly directly exposed to the sun and as a result both absorb and release heat.

Metal roof r value. For a very good introductory overview article on r value see r values over at the website of. The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value. The amount shown is an average amount used for roof system r value calculations.

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. Metal insulating 2 inch w urethane 15 00 air films interior ceiling 0 61 interior wall 0 68. Energy efficiency is a totally different consideration when it comes to roof material selection.

Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value of building materials material r inch r thick ness fiberglass inch 3 00. Roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91.

Rsi r value système international is the metric equivalent. R value is used in the united states. A contemporary metal roof on a home can improve that home s resale value by 1 to 6 percent when compared with an asphalt shingled home. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. 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. Inches mm r value spanability 1 00 25 6 00 2 5 8 1 50 38 9 00 4 3 8 1 60 41 9 60 4 3 8 insulation must be protected from open flame and kept dry at all retrieve doc. R value of various materials.

Labor itself averages 300 to 500 per square and 4 500 7 500 for a 1 500 square foot roof. Metal roofs cost an average of 4 500 to 11 500 including installation and materials. The r values of both metal roofing and asphalt shingles are negligible but this is not to be confused with energy efficiency. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

To convert rsi to r value multiply the rsi by 5 67826. Extruded expanded polystyrene insulation is.