Metal Building Roof Insulation R Value

R value is the measurement of insulation effectiveness to prevent heat loss.

Metal building roof insulation r value.

Be aware that improper installation can significantly lower the effectiveness of insulation. 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. The higher the r value of insulation the more energy saved.

Amount of time and research over the past two decades on the insulation methods and performance expectations for metal building roof and wall assemblies. 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. 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. 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.

It is common to install a double layer system to achieve a higher r value envelope. When determining how much insulation you need don t guesstimate calculate. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. This is dependent on the depth of the purlins girts.

Beginning in 2005 the buildings technology center at the oak ridge national laboratory. For a very good introductory overview article on r value see r values over at the website of. In order to select the metal building insulation that will best meet your needs first you need to understand r value. Know exactly how much you need with our project calculators.

The higher the r value the greater the insulation performance. 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 thicker the fiberglass insulation blanket the higher the r value.

R value of various materials. 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. Multiple thicknesses or layers can be combined in a double layer system to achieve high r values. Built up roof membrane gravel surfaced membrane and gravel only 0 33.

R value per inch ft f hr btu rsi per millimeter k m w r value for typical installed thickness not per inch source. For over 30 years we have developed and promoted high r value insulation systems in metal buildings. Uncompressed unfaced insulation rests on top of the membrane between the purlins. Up to 6 r 19 can be used in a single layer appliction.