Do Attics With Spray Foam Insulation Need Ventilation

They know roofing materials underlayments flashing and attic ventilation.

Do attics with spray foam insulation need ventilation.

Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic. However in a traditionally insulated attic insulation on the ceiling the attic is vented. 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. They need the right level of ventilation but they also require insulation in order to help improve the energy efficiency of the property.

Nothing unusual about that. One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic. It s terrific because it s pretty much the same temperature as the rest of the house all the time. The ventilation helps to keep the air fresh in the home the insulation stops warm air from escaping and cold air from leaking in.

Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. We also recommend to do no harm when we. Earlier this year i got a question about a home that had spray foam insulation in the attic. I have a spray foamed attic.

Therefore providing mechanical fresh air ventilation is especially important in spray foam houses. 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. Moisture is also another huge issue when it comes to spray foam insulation in an attic. Do attics with spray foam insulation need ventilation.

When we seal the attic with spray foam it s as tight as a butter tub. Sometimes humidity levels spike in an attic after a spray foam job. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits. Some know more than others of course but you should probably assume the worst any time a roofer comes to your spray foam insulated home.

Nope you absolutely do not need to ventilate a spray foam house and here s why. Because basically now that attic is a conditioned space. It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing. Tell them the attic is to have no ventilation of any type.