Spray Foam Attic Ridge Vent

Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof.

Spray foam attic ridge vent.

The attic you see in the photo here is a different home but it does have one feature in common besides the spray foam. One of the biggest benefits of using spray foam is to get greater airtightness. In typical construction and climates building code tables can be followed when using spf as an insulation and air seal. If you look closely you ll see two exhaust flues on the left side.

Sorry photo did not come out. The installer sprayed foam directly on the metal flues. Inspected a house yesterday with spray foam insulation in the attic. Spray foam from home logic is an excellent insulation type to choose for the attic.

You should never do this. They are holes in the insulation. The two products most often used in an unvented attic assembly are medium and low density sprayed polyurethane foam spf. My thinking is that the ridge vent should be sealed or removed as wind blown rain that enters has no place to go.

The spray foam expands on contact filling up the space where it begins working immediately. A ridge vent was still present. Normally in occupied areas all spray foam must be covered by a 15 minute thermal barrier such as thick drywall per code requirements in irc section 316 4 and ibc section 2603 4. Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space.

Windows in a conditioned attic are similar to windows in your home. Spray foam is applied directly where it s needed ensuring that any ventilation vents are left untouched. That means you get rid of all attic ventilation whether it s passive ridge gable soffit vents or active fans. This section of the code also describes the use of thermal barriers it seems like the radiation of heat through the windows would make the attic hot.

Rigid foam and spray foam are two of them. One of the most common reasons to put spray foam on the roofline is to avoid having to air seal the attic floor because the attic is connected with the air in the house and indoor air is more humid than outdoor air which can cause moisture problems. You ll also see another safety hazard and code violation. Building codes provide for the use of spray polyurethane insulation in the foam plastic section.

All insulation materials require proper venting.