Do You Need Attic Ventilation With Spray Foam Insulation

Because basically now that attic is a conditioned space.

Do you need attic ventilation with spray foam insulation. The most important thing to remember is to use the correct type of insulation and to ensure it is installed correctly. However in a traditionally insulated attic insulation on the ceiling the attic is vented. Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic. If a blower door test reveals that your spray foam insulation reduced ventilation beyond an acceptable level you may need to install one of these units in your home.

Here s the answer to the question posed in my article title. Yes using spray foam we have added your attic to the conditioned space. Earlier this year i got a question about a home that had spray foam insulation in the attic. Therefore providing mechanical fresh air ventilation is especially important in spray foam houses.

Nothing unusual about that. Nope you absolutely do not need to ventilate a spray foam house and here s why. Mechanical ventilation systems allow a constant flow of outside air into the home and can also provide filtration dehumidification and conditioning of the incoming outside air. Spray foam insulation will not prevent ventilation and so there s no need to avoid it thinking that it will result in mould and mildew from building up inside the attic space.

It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing. It s terrific because it s pretty much the same temperature as the rest of the house all the time. When we seal the attic with spray foam it s as tight as a butter tub. High attic humidity often results from spray foam insulation.

A combination of air sealing and insulating the attic floor while providing ventilation considerably reduces potential for condensation as warm moist air is less likely to enter the space and condense on cold surfaces. Moisture is also another huge issue when it comes to spray foam insulation in an attic. We also recommend to do no harm when we.