Rigid Insulation Above Roof Deck

Rigid foam installation after the roof deck is ready the rigid foam insulation is installed.

Rigid insulation above roof deck.

Install insulating sheathing above the roof deck on existing homes. With a minimum of 70 recycled content the installed thermafiber products contributed to valuable leed credits helping the building earn a leed platinum certification. 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. Case study salesforce tower.

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. 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. Rmax operating llc rmax nailable base 3 insulation for above the deck description. Owens corning foamular xps insulation is a closed cell moisture resistant rigid foam board ideal for many roofi ng applications including single ply protected roof membrane assemblies prma tapered vegetative roofs plaza decks architectural metal roofi ng and recover roofi ng.

For standard steel deck construction this approach has many advantages such as. The trim the frieze boards the fascia and the overhangs all had to look like they belonged. The dew point is typically within the insulation layer lowering condensation risks. We re proud to say our products can be found in some of the tallest and safest buildings around the globe like salesforce tower.

I m considering a roof design that would place all the insulation above the roof deck with no insulation below. They had to look original. The project is in climate zone 4 seattle area and i want to have an open beam look in the ceiling. I would use polyiso with a top layer of eps as recommended in your blog post on the topic.

Placing a layer of fluffy insulation below the roof deck would needlessly complicate the. Remove existing roofing and non adhered underlayment to expose roof sheathing. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic. The r value is a measurement of the heat loss and heat gain.