Minimum Roof R Value For Tapered Insulation

It is readily available in the two most popular and efficient tapers 1 8 3 18 mm per foot 305 mm 1 and 1 4 6 35 mm per foot 3 18 mm 2.

Minimum roof r value for tapered insulation.

A properly designed tapered roof insulation system not only provides the necessary r value and the support for the roof system but it helps extend the. Higher r values mean greater insulating power. Since a tapered insulation system will increase thickness away from the low points the overall system r value will. For a very good introductory overview article on r value see r values over at the website of.

Standard material is johns manville enrgy 3 tapered and flat polyisocyanurate roof insulation. One area where effective u values are commonly misunderstood is tapered insulation for low slope roofs or at the eaves of sloped roofs. The r values shown above are the minimum r values required to meet code requirements. The standard tapered panel size is 4 x 4.

Find out why in the seller s fact sheet on r values. When correctly installed tapered insulation helps eliminate problems due to ponding water and can extend the longevity of your low slope roofing system. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

R value of various materials. Tapered roof insulation systems are designed to provide a 1 savings vary. This bulletin presents the theory and calculation methods used to develop tables of effective r values for tapered insulation. R 20ci r 25ci r 25ci r 30ci r 30ci r 30ci r 35ci r 35ci question.

View document share this post. Thermapink tapered roof insulation provides a thermally effi cient moisture resistant positive drainage slope for use under single ply or other types of roofi ng systems. Minimum insulation r value requirements non residential above roof deck. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.