March 14, 2026

How to Seal Attic Gaps

Air leaks waste hundreds of dollars in heating and cooling energy and make your home less comfortable. They also let in pollen, dust and other pollutants that aggravate respiratory problems and exacerbate allergies. The best way to reduce air leaks is to install insulation and air-seal around the attic. Depending on the state of your attic, you may be eligible for financial assistance to cover the costs of making these improvements.

A Homeowner’s Guide to Sealing Attic Gaps

Most attic leaks occur around recessed lighting, plumbing vents, chimneys, attic hatch doors and where walls meet the attic floor. Leaks around electrical wiring, duct penetrations and framing joints can also contribute to energy loss. If you’ve noticed a drafty feeling in your home, look for signs of attic leakage:

You can easily find and fix most attic air leaks yourself using caulk or expandable foam sealant. Ensure you’re using a foam sealant that is specifically designed for insulation. Some products sold in DIY kits (such as Icynene) don’t offer the same R-values and may be prone to deterioration over time.

When preparing for attic insulation, prioritize safety by wearing gloves, safety goggles, and a dust mask. Additionally, use a ladder that’s sturdy and appropriate for the height of your attic to avoid falling injuries. Once in the attic, use a flashlight to illuminate areas where water leaks might be hiding. Use plastic sheets and buckets to catch any pooled water to prevent water damage to the living spaces below.

Coastline Insulation
268 Serenoa Rd Unit 2B, Santa Rosa Beach, FL 32459
(850)-565-1027

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