Residential Metal Building Roof R Value

R value of various materials.

Residential metal building roof r value.

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. In insulated metal panels r value of the core foam is calculated according to the astm c518 standard test method. An optional purlin bearing leg pbr rests on purlins and provides support for fastening the panel lap. 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.

R panel is a multi use wall and roof panel used primarily in pre engineered metal building applications. R value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00. 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. Roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91.

R value is defined as an insulating material s capacity to resist the flow of heat. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation.

Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. R panel is also a popular choice for residential metal roofing especially in the southwest. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721.

Price your building. Minimum insulation r value requirements by state. Metal 1 00 metal insulating 2 inch w urethane 15 00 air films interior ceiling 0 61. Higher r values are an indication of greater insulation power.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. For a very good introductory overview article on r value see r values over at the website of. To convert rsi to r value multiply the rsi by 5 67826.