Roof Venting With Rigid Foam

If you have a vented attic it makes no sense to install rigid foam above the roof sheathing.

Roof venting with rigid foam. When set into place and sealed with spray foam the vent baffles are insulated and air sealed. You might as well put the rigid foam in the branches of a tree in your back yard. Roof ridge exhaust vent in black case model 2018000 93 31 case. Roof vent attic fan plastic ridge vents air vent ridge vents gaf venting attic.

Similarly not everyone can afford to spray nearly 10 in. Owens corning ventsure 11 in. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. Of open or closed cell spray foam in their roof or to stack a half foot of rigid foam on the roof deck.

A thick typically 1 5 thick closed cell polyurethane waterproofing barrier seals the roof against leaks. Gaf cobra rigid vent 3 11 5 in. Spray polyurethane foam spf is the only roofing material that has no seams. The dura foam roof system has a rigid and durable surface that you can walk on.

We have the capabilities to spray and inject a variety of foam systems to achieve a high r value while providing both effective vapor and air barriers. Many homes in more urban areas or other places with dense populations are opting for this method because they can better optimize space. An alternative option is to insulate the rafter bays with a less expensive insulation like fiberglass or cellulose and to control the temperature of the roof sheathing with rigid foam. The minimum insulation requirements for ceilings walls floors and foundations in new homes as listed in the 2009 2012 2015 and 2018 iecc and irc can be found in this table.

Foam roofing bonds around roof penetrations such as pipes vents and edges. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. The rigid foam is cut to be 2 inches wider than the space between rafters then 1 inch of foam is scored and folded over on either side of the foam creating standoffs that hold the foam away from the roof sheathing providing a space for air to flow. 2009 2018 iecc and irc minimum insulation requirements.

2009 international energy conservation code iecc section 101 4 3 additions alterations renovations or repairs. Ridge vent rigid roll with weather protector. Foam tech creates superior insulation and environmental control solutions by installing safe cost effective and environmentally friendly polyurethane foams. Set your store to see local availability add to cart.

Installing rigid foam insulation on top of roof sheathing is a great option for commercial buildings and homes with limited space.