Attic Prep Before Insulating
The most attic insulation and cost-effective insulation is often found in the attic or roof cavities of a building. Adding insulation to the attic is a moderately difficult do-it-yourself (DIY) project and can be done as part of a home improvement or renovation.
Before insulating, the attic needs to be cleaned and prepped. Make sure that everything is removed, including holiday decorations and old family photos. You also want to check that there are no critters in the attic, especially rats. You can find more information on how to do this in our article “Preparing for Attic Insulation”.
It’s important to have an air barrier before insulating. If you don’t seal leaks before laying fiberglass batts or cellulose, it doesn’t matter how much insulation you add—hot/cold air will still leak into the living space through the ceiling and walls. You can use expanding spray foam and caulk to address these gaps and cracks.
Stop Attic Moisture Damage
If you are insulating a cathedralized attic, you need to air seal the bottom of the roof deck before insulating. It’s also a good idea to install insulation in the eaves and soffit areas to prevent heat transfer from the attic to living spaces.
Blown cellulose or fiberglass should not be installed over recessed lighting fixtures. If you plan to install blown insulation, create a box around each fixture with a minimum of three inches of open space or move the fixture to another location in the attic where it will not be insulated. Alternatively, you can install a non-combustible cellulose, cellulose fiber or polyisocyanurate foam board, which are fire-rated and provide an effective firestop.
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