Rigid Insulation Above Roof Deck

I would use polyiso with a top layer of eps as recommended in your blog post on the topic.

Rigid insulation above roof deck.

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. Install insulating sheathing above the roof deck on existing homes. Rmax operating llc rmax nailable base 3 insulation for above the deck description.

They had to look original. The trim the frieze boards the fascia and the overhangs all had to look like they belonged. We re proud to say our products can be found in some of the tallest and safest buildings around the globe like salesforce tower. 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.

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

The dew point is typically within the insulation layer lowering condensation risks. For standard steel deck construction this approach has many advantages such as. Case study salesforce tower. The r value is a measurement of the heat loss and heat gain.

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. Remove existing roofing and non adhered underlayment to expose roof sheathing. 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.