Spray foam is eco friendly non toxic and thermally efficient.
Spray foam attic ridge vent.
Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space.
Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof.
Windows in a conditioned attic are similar to windows in your home.
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.
If you look closely you ll see two exhaust flues on the left side.
Building codes provide for the use of spray polyurethane insulation in the foam plastic section.
You should never do this.
Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements.
They are holes in the insulation.
All insulation materials require proper venting.
In typical construction and climates building code tables can be followed when using spf as an insulation and air seal.
That means you get rid of all attic ventilation whether it s passive ridge gable soffit vents or active fans.
My thinking is that the ridge vent should be sealed or removed as wind blown rain that enters has no place to go.
Rigid foam and spray foam are two of them.
Actually you should probably get rid of power attic ventilators whether or not you re sealing the attic but that s another article.
The spray foam expands on contact filling up the space where it begins working immediately.
One of the biggest benefits of using spray foam is to get greater airtightness.
Inspected a house yesterday with spray foam insulation in the attic.
Sorry photo did not come out.
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.
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.
The installer sprayed foam directly on the metal flues.
The attic you see in the photo here is a different home but it does have one feature in common besides the spray foam.
Spray foam from home logic is an excellent insulation type to choose for the attic.
The two products most often used in an unvented attic assembly are medium and low density sprayed polyurethane foam spf.
