Foam Attuc Insulation Vs Attic Fan

Nothing unusual about that.

Foam attuc insulation vs attic fan.

Attic hatch or door. If we assume that the outside air is 10 f warmer than the desired. 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. When we seal the attic with spray foam it s as tight as a butter tub.

Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic. In a new home spraying foam in the roofline can bring the ducts inside the envelope without having to redesign the system and house. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. Moisture is also another huge issue when it comes to spray foam insulation in an attic.

The alternative would be to install an attic fan that would draw cooler outside air into the attic while expelling the hot air. For diy attic insulation you ve got two choices. Direct all exhaust fans and vents to the exterior. Affix rigid foam insulation to the attic side of the hatch or door.

Earlier this year i got a question about a home that had spray foam insulation in the attic. Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. If planning to insulate the attic ceiling you could use the former though the foam in the top pic likely has fiberglass under it too. We d only use one or the other.

Topshot oct 4 16 at 16 34 also if you have any air gaps behind the foam and any way for air to flow in and out of that space your insulation value is reduced to near zero. Loose fill or batt the common term for blanket insulation. Signs that your attic insulation is subpar include drafts uneven temperatures between rooms high heating cooling bills and ice dams in the winter i e those pretty icicles that hang from the. However in a traditionally insulated attic insulation on the ceiling the attic is vented.

I d blow insulation on the attic floor after air sealing of course. If you don t have hvac and ducts in the attic spray foam on the roofline isn t really necessary. Get tips on installing sufficient attic ventilation to vent the air that gets pulled up there. Find out whether you have to worry about an attic fan blowing your insulation around.