Minimum Roof R Value For Tapered Insulation

One area where effective u values are commonly misunderstood is tapered insulation for low slope roofs or at the eaves of sloped roofs.

Minimum roof r value for tapered insulation.

Minimum insulation r value requirements non residential above roof deck. How does this affect r values on a tapered insulation system. This bulletin presents the theory and calculation methods used to develop tables of effective r values for tapered insulation. Tapered roof insulation systems are designed to provide a 1 savings vary.

The r values shown above are the minimum r values required to meet code requirements. Since a tapered insulation system will increase thickness away from the low points the overall system r value will. 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. Find out why in the seller s fact sheet on r values.

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. Higher r values mean greater insulating power. Slope cross sections published feb. 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.

Standard material is johns manville enrgy 3 tapered and flat polyisocyanurate roof insulation. R 20ci r 25ci r 25ci r 30ci r 30ci r 30ci r 35ci r 35ci question. R value of various materials. For a very good introductory overview article on r value see r values over at the website of.

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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. The standard tapered panel size is 4 x 4. You should of course see the manufacturer provided technical data sheet for the r value of specific products.