Rigid Insulation Above Roof Deck R Value

This matrix provides the minimum insulation r values required by local and state municipalities.

Rigid insulation above roof deck r value.

The project is in climate zone 4 seattle area and i want to have an open beam look in the ceiling. For a very good introductory overview article on r value see r values over at the website of. Depending on the type of insulation you choose and the desired r value you want for your facility you may need to build up a few layers of insulation. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product.

Notes on the r value k values of different forms of asbestos. You should of course see the manufacturer provided technical data sheet for the r value of specific products. After the roof deck is ready the rigid foam insulation is installed. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

Insulation adhesives primers sealants air and vapor barriers. With three layers of 11 2 in. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

The r value is a measurement of the heat loss and heat gain. R value is used in the united states. Rsi r value système international is the metric equivalent. R value of various materials.

I m considering a roof design that would place all the insulation above the roof deck with no insulation below. Minimum insulation r value requirements by state. High r value unvented roof assemblies will require a proportionally larger amount of insulation above the roof deck for condensation control. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

Polyisocyanurate insulation above the sheathing and approximately 91 4 in. Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. The higher the r value means there is a higher ability to. I would use polyiso with a top layer of eps as recommended in your blog post on the topic.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof. Table r806 5 in the 2012 irc r806 4 in the 2009 irc indicates the amount of insulation above the roof deck required for condensation control assuming minimum required total insulation. Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal.

To convert rsi to r value multiply the rsi by 5 67826. Non residential above roof deck.