Rigid Insulation Above Roof Deck

They had to look original.

Rigid insulation above roof deck. Rigid foam installation after the roof deck is ready the rigid foam insulation is installed. For most of us in the low slope roofing industry it s considered to be absolutely standard to have insulation placed above the roof deck. We re proud to say our products can be found in some of the tallest and safest buildings around the globe like salesforce tower. The r value is a measurement of the heat loss and heat gain.

Nailable base 3 an all in one roof insulation and nailing surface has a 7 16 thick osb nailing panel bonded to a polyiso foam board with glass fiber organic mat facers. I m considering a roof design that would place all the insulation above the roof deck with no insulation below. The 6 inches of rigid insulation added to the top of the existing roof deck needed to be done in a manner that was invisible. The project is in climate zone 4 seattle area and i want to have an open beam look in the ceiling.

According to section r806 4 of the 2009 irc this approach requires that rigid board or sheet insulation shall be installed directly above the structural roof sheathing as specified in table r806 4 for condensation control in the 2015 irc the comparable code requirements can be found in section r806 5. I would use polyiso with a top layer of eps as recommended in your blog post on the topic. It is an acceptable practice to install a new roof over an existing roof membrane system provided that the roof deck is structurally sound and has been properly prepared to support the added load. The dew point is typically within the insulation layer lowering condensation risks.

For standard steel deck construction this approach has many advantages such as. Rmax operating llc rmax nailable base 3 insulation for above the deck description. The trim the frieze boards the fascia and the overhangs all had to look like they belonged. With a minimum of 70 recycled content the installed thermafiber products contributed to valuable leed credits helping the building earn a leed platinum certification.

Case study salesforce tower. Placing a layer of fluffy insulation below the roof deck would needlessly complicate the. Install insulating sheathing above the roof deck on existing homes. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.