Foam Attuc Insulation Vs Attic Fan

Get tips on installing sufficient attic ventilation to vent the air that gets pulled up there.

Foam attuc insulation vs attic fan.

Find out whether you have to worry about an attic fan blowing your insulation around. The alternative would be to install an attic fan that would draw cooler outside air into the attic while expelling the hot air. Earlier this year i got a question about a home that had spray foam insulation in the attic. One of the most hotly contested debates in the world of attic insulation is the question fiberglass or spray foam whereas fiberglass has been a classic go to staple insulated in american homes for several decades now spray foam is the en vogue new kid in the neighborhood generating all the latest buzz.

We d only use one or the other. If you don t have hvac and ducts in the attic spray foam on the roofline isn t really necessary. 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. In a new home spraying foam in the roofline can bring the ducts inside the envelope without having to redesign the system and house.

If you have air conditioning and you use an attic fan you tend to suck the air conditioning out of the house as well. For diy attic insulation you ve got two choices. 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. Affix rigid foam insulation to the attic side of the hatch or door.

It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing. Attic hatch or door. However in a traditionally insulated attic insulation on the ceiling the attic is vented. Add weatherstripping around the perimeter and a sweep to the door of a walk up 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. If we assume that the outside air is 10 f warmer than the desired. Direct all exhaust fans and vents to the exterior.

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. I d blow insulation on the attic floor after air sealing of course. Moisture is also another huge issue when it comes to spray foam insulation in an attic. 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.