Foam Attuc Insulation Vs Attic Fan

Affix rigid foam insulation to the attic side of the hatch or door.

Foam attuc insulation vs attic fan.

Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. If you don t have hvac and ducts in the attic spray foam on the roofline isn t really necessary. 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. Earlier this year i got a question about a home that had spray foam insulation in the attic.

For diy attic insulation you ve got two choices. We d only use one or the other. Loose fill or batt the common term for blanket insulation. The alternative would be to install an attic fan that would draw cooler outside air into the attic while expelling the hot air.

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. In a new home spraying foam in the roofline can bring the ducts inside the envelope without having to redesign the system and house. When we seal the attic with spray foam it s as tight as a butter tub. If you have air conditioning and you use an attic fan you tend to suck the air conditioning out of the house as well.

Moisture is also another huge issue when it comes to spray foam insulation in an attic. I d blow insulation on the attic floor after air sealing of course. 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 has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing.

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. 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. Nothing unusual about that. Find out whether you have to worry about an attic fan blowing your insulation around.

Attic hatch or door. 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 we assume that the outside air is 10 f warmer than the desired.