Minimum Roof R Value For Tapered Insulation

Minimum insulation r value requirements non residential above roof deck.

Minimum roof r value for tapered insulation.

The r values shown above are the minimum r values required to meet code requirements. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. View document share this post. Slope cross sections published feb.

The standard tapered panel size is 4 x 4. R value of various materials. 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. This bulletin presents the theory and calculation methods used to develop tables of effective r values for tapered insulation.

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. How does this affect r values on a tapered insulation system. R 20ci r 25ci r 25ci r 30ci r 30ci r 30ci r 35ci r 35ci question. The goal of tapered roof insulation systems is to eliminate ponding standing water on a membrane when the roof deck does not provide adequate slope.

Find out why in the seller s fact sheet on r values. One area where effective u values are commonly misunderstood is tapered insulation for low slope roofs or at the eaves of sloped roofs. 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.

Higher r values mean greater insulating power. Tapered roof insulation systems are designed to provide a 1 savings vary. 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. For a very good introductory overview article on r value see r values over at the website of.