Minimum Roof R Value For Tapered Insulation

How does this affect r values on a tapered insulation system.

Minimum roof r value 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. Since a tapered insulation system will increase thickness away from the low points the overall system r value will. R 20ci r 25ci r 25ci r 30ci r 30ci r 30ci r 35ci r 35ci question. This bulletin presents the theory and calculation methods used to develop tables of effective r values for tapered insulation.

The standard tapered panel size is 4 x 4. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Minimum insulation r value requirements non residential above roof deck. Standard material is johns manville enrgy 3 tapered and flat polyisocyanurate roof insulation.

For a very good introductory overview article on r value see r values over at the website of. 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. Tapered roof insulation systems are designed to provide a 1 savings vary. R value of various materials.

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. Higher r values mean greater insulating power. 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.

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. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The r values shown above are the minimum r values required to meet code requirements. Slope cross sections published feb.