Rigid Insulation Above Roof Deck R Value

The higher the r value means there is a higher ability to.

Rigid insulation above roof deck r value.

This matrix provides the minimum insulation r values required by local and state municipalities. Non residential above roof deck. The r value is a measurement of the heat loss and heat gain. I would use polyiso with a top layer of eps as recommended in your blog post on the topic.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Placing a layer of fluffy insulation below the roof deck would needlessly complicate the. You should of course see the manufacturer provided technical data sheet for the r value of specific products. 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.

R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. Minimum insulation r value requirements by state. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Polyisocyanurate insulation above the sheathing and approximately 91 4 in. Insulation adhesives primers sealants air and vapor barriers. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

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. With three layers of 11 2 in. Notes on the r value k values of different forms of asbestos. R value of various materials.

Rsi r value système international is the metric equivalent. To convert rsi to r value multiply the rsi by 5 67826. For a very good introductory overview article on r value see r values over at the website of. R value is used in the united states.

After the roof deck is ready the rigid foam insulation is installed. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof. I m considering a roof design that would place all the insulation above the roof deck with no insulation below. High r value unvented roof assemblies will require a proportionally larger amount of insulation above the roof deck for condensation control.

Notes to the table above. The project is in climate zone 4 seattle area and i want to have an open beam look in the ceiling.