Metal Building Roof Insulation R Value

The higher the r value the greater the insulation performance.

Metal building roof insulation r value.

For over 30 years we have developed and promoted high r value insulation systems in metal buildings. R value of roofing materials and building insulation. For a very good introductory overview article on r value see r values over at the website of. When choosing metal building insulation there are several thicknesses or r value s to choose from ranging from 2 5 8 r 8 to 9 5 r 30.

The thicker the fiberglass insulation blanket the higher the r value. Amount of time and research over the past two decades on the insulation methods and performance expectations for metal building roof and wall assemblies. This is dependent on the depth of the purlins girts. Uncompressed unfaced insulation rests on top of the membrane between the purlins.

For multilayer installations the last rated r value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached ashrae news release january 12. R value measures how well certain building insulation materials can resist heat. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The higher the r value of insulation the more energy saved.

When determining how much insulation you need don t guesstimate calculate. Beginning in 2005 the buildings technology center at the oak ridge national laboratory. This system enables the performance values to be increased significantly and is considered an innovative new construction of metal buildings for energy savings. National roofing contractors association.

Be aware that improper installation can significantly lower the effectiveness of insulation. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Although metal carports do not require insulation many people who choose to construct this type of steel building do so because they plan to fill in the gaps with concrete blocks. Multiple thicknesses or layers can be combined in a double layer system to achieve high r values.

High r value insulation systems. R value of various materials. R value is the measurement of insulation effectiveness to prevent heat loss. Built up roof membrane gravel surfaced membrane and gravel only 0 33.

Including its r value of 2 2 5 per inch there are various reasons why you may choose to use concrete blocks rather than traditional steel wall panels but the most common reason is increased security. Below is a listing of the accepted r values for fiberglass blanket insulation of different thicknesses when properly installed in metal buildings higher numbers indicate greater effectiveness. It is common to install a double layer system to achieve a higher r value envelope. Know exactly how much you need with our project calculators.