Air Sealing With Spray On Sealant

Leaks and drafts can affect your home atmosphere. That’s where air sealant comes into play. Filling voids and cracks where air can leak into or out of your home can increase home comfort, reduce energy costs and make for a healthier indoor environment.

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Key Benefits

Improved Indoor Air Quality

Less outside air leaking in allows you to better control the air inside

Save Money

Helps save on your home’s heating and cooling bills

Year-Round Comfort

Maintain indoor temperatures in the winter and the summer

Improved Durability

Seals voids and cracks that vapor could seep through

Why You Need Air Sealant

As conditioned air exits your home, outdoor air enters through small gaps throughout your home, attic, basement, crawlspace, garage or walls. On top of losing your already conditioned air, the outdoor air is bringing in water vapor, dust, allergens and many other pollutants which can leave you with an uncomfortable house with poor indoor air quality, that is more expensive to heat and cool.

Where can you seal to protect your family against poor indoor air quality and save money on utility bills? Every house is different, so we recommend hiring a qualified energy auditor to test your house to tell you exactly where your house is leaking — and where air sealant is needed.

Common Areas of Air Leakage

Areas of the Ceiling:

Do you have ducts, recessed lights or electrical boxes in your ceiling? These are some of the most common leakage pathways in a home. Seal duct boots, recessed light housing or electrical boxes directly to your ceiling to stop leaking conditioned air and keep attic air where it belongs — in your attic.

Top Plates of Walls:

If you are going to be adding insulation to your attic, it could be beneficial to seal your drywall to the "top plates" of your walls, or the penetrations mentioned above, from the attic side before insulating.

Basement Walls:

If you have a basement, another common air leak is where your floor joist rests on the basement wall. Seal the inside corners on the top and bottom of this short “cavity” and apply another bead of sealant where the bottom “plate” rests on the basement wall. If you see daylight, or have penetrations through this cavity, seal those, too.

Electrical Boxes:

Removing cover plates from electrical boxes and sealing the box directly to the drywall can help reduce air leakage, especially on walls shared with garages or other common spaces. If you have an attached garage, and your house-to-garage wall is open on the garage side, seal all penetrations and inside the plates to the drywall.

Subfloors:

Sealing your drywall to the "bottom plate," and your bottom plate to the "subfloor" can be your last line of defense against air leaks.

NOTE:

ASHRAE, ICC, and IECC recommend make up air once home is below 3ACH at 50Pa. Knauf Insulation strongly recommends hiring a qualified energy auditor to test your home before and after air sealing.

Check Out Our Spray-On Sealant Solution

Our spray-on sealant, Knauf Insulation's ECOSEAL Plus™ with Gasket Pro Technology, is a compressible, water-based elastomeric spray that can help with your indoor air quality and air leakage needs.