The attic can be one of the least energy efficient spaces of the house without the proper attic insulation and attic venting. During the hot months, without an attic exhaust fan or attic venting, the space can get too hot. And all year around, proper attic insulation will help maintain and regulate proper temperatures.
Attic Insulation with Spray Foam Insulation
Here's how to insulate an attic with spray foam insulation:
First, do a test spray. Remember, this material expands to about 100 times its initial volume, so use it conservatively.
Next, spray evenly between the studs and on the backside of the exterior sheathing. Allow it to expand so it fills all the gaps.
After allowing the spray foam insulation to form and set, take a handsaw blade and shave away any foam that extends past the studs.
Attic Insulation with Fiberglass Insulation
The most common attic insulation method is to place fiberglass insulation batts between the studs and staple them into place. This is an acceptable attic insulation method, but it does not create an airtight seal, so heat can enter and escape.
Attic Vent
Builders must pay close attention to attic venting so moisture can't encourage mold growth and cause the roof's wood to rot. The best way to ventilate an attic is to create a continuous ridge-and-soffit ventilation system, which creates a continuous flow of air upward from the eaves or soffits out through the ridge.
Attic Exhaust Fans
Attic exhaust fans can also help reduce temperatures in the attic. Many have built-in thermostats that turn the attic exhaust fan on when necessary, and then shut the fan off, helping conserve energy.
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