Spray Foam Attic Ridge Vent

The spray foam expands on contact filling up the space where it begins working immediately.

Spray foam attic ridge vent.

Spray foam from home logic is an excellent insulation type to choose for the attic. One of the biggest benefits of using spray foam is to get greater airtightness. A ridge vent was still present. My thinking is that the ridge vent should be sealed or removed as wind blown rain that enters has no place to go.

If you look closely you ll see two exhaust flues on the left side. Spray foam is applied directly where it s needed ensuring that any ventilation vents are left untouched. Sorry photo did not come out. Inspected a house yesterday with spray foam insulation in the attic.

Windows in a conditioned attic are similar to windows in your home. Actually you should probably get rid of power attic ventilators whether or not you re sealing the attic but that s another article. Spray foam is eco friendly non toxic and thermally efficient. Rigid foam and spray foam are two of them.

The attic you see in the photo here is a different home but it does have one feature in common besides the spray foam. All insulation materials require proper venting. The installer sprayed foam directly on the metal flues. 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 should never do this. That means you get rid of all attic ventilation whether it s passive ridge gable soffit vents or active fans. 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. They are holes in the insulation.

In typical construction and climates building code tables can be followed when using spf as an insulation and air seal. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof. The two products most often used in an unvented attic assembly are medium and low density sprayed polyurethane foam spf. Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements.

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.