Note: This DIY article is provided as a general guide only and is not intended to take the place of product-specific installation procedures; always follow applicable manufacturers’ instructions. Depending on your home’s age and condition, location within the home, and other potential factors, repairs and/or upgrades or other services may be necessary prior to the beginning and/or completion of your project that may involve the services of a home improvement professional. This article does not include advice pertaining to local building codes and/or any related inspections.

When it comes to keeping your home comfortable and energy efficient, most people think of sealing around windows and doors. And while those areas are essential, they’re just the tip of the iceberg because air leaks often hide in places you may never have thought to check. For those looking to stop sneaky drafts, this article shares where to look and which products will help.

Tiny gaps between your baseboards and the floor or wall may not seem like a big deal, but collectively, they can let in a surprising amount of outside air, especially in older homes.

Why hidden air leaks matter

While large gaps around doors and windows are easy to spot, you can’t ignore the smaller, hidden leaks throughout your home. In the summer, your conditioned air can escape through these spots. And in the winter, cooler air from the outdoors can make its way inside. It may not seem like much, but it adds up. 

Beyond that, these air leaks also:

• Allow outdoor allergens and pollutants into your home
• Create cold spots in winter and hot zones in summer
• Put extra strain on your HVAC system
• Increase your risk of moisture and pest intrusion

That’s why sealing even the smallest openings can make a big difference in comfort and cost.

Commonly missed areas where air leaks happen

To ensure cold air isn’t making its way into your home, here are a few areas you’ll want to inspect.

Baseboards and trim

Tiny gaps between your baseboards and the floor or wall may not seem like a big deal, but collectively, they can let in a surprising amount of outside air, especially in older homes.

To seal baseboards, use a high-quality sealant that adheres well to both wood and drywall. We recommend GE Pro Seal Max Kitchen & Bath. It’s a hybrid product that offers the performance of silicone and the paintability of acrylic. This will allow you to paint the sealant to match your trim. Run a bead of caulk along your baseboards’ top and bottom edges and smooth it out with a Sealant Smoothing Tool. Not only does this improve draft prevention, but it also gives your trim a finished look.

Attic hatches and pull-down stairs

Your attic access point is a significant source of heat loss, especially if it lacks proper insulation or weatherstripping. Gaps around the hatch or pull-down stairs allow warm air to rise and escape during winter, while letting in hot air during the summer.

To air-seal your attic hatch, install adhesive weatherstripping around the frame to create a tighter seal. You can apply insulating foam around the edges or corners for added protection if there are noticeable gaps. For smaller cracks less than one inch wide, try GE Gaps & Cracks Insulating Foam.

Electrical outlets and switches

Believe it or not, outlets and light switches are notorious for leaking air, especially on exterior walls. These small boxes are often poorly insulated, allowing outdoor air into your home.

To air seal outlets, remove the cover plate and insert foam gaskets behind it. Then, use an expanding insulating foam to seal any visible gaps around the electrical box inside the wall.

Plumbing and HVAC penetrations

Check areas where pipes and ducts pass through walls, ceilings, and floors, especially around sinks, bathtubs, utility rooms, and the HVAC system. These openings are commonly overlooked and can leak significant amounts of air if left unsealed.

Use GE Big Gaps & Cracks to seal larger gaps one to three inches wide around pipes and ductwork. For smaller cracks that are less than one inch wide, GE Gaps & Cracks will do the trick. Sealing these areas also helps with pest prevention, as insects and rodents often enter through the same gaps.

Recessed lighting fixtures

Recessed can lights that penetrate your attic are another sneaky source of energy loss. Many older fixtures aren’t airtight, allowing conditioned air to rise and escape.

Using insulating foam, you can upgrade to airtight fixtures or seal around the can housing. Just be sure not to block ventilation if the light isn’t designed for insulation contact.

Floor-to-wall joints in the basement or crawl space

Basements and crawl spaces are often the draftiest parts of a home. Check where the walls meet the floor for visible cracks or gaps. Use insulating foam for any openings you find. Sealing these joints helps reduce both energy loss and moisture infiltration.

The best products for draft prevention

It pays to have the right products on hand when dealing with various surfaces and gap sizes. Here’s what we recommend if you want to seal baseboards or air seal outlets:

• Silicone sealant: Silicone is perfect for interior gaps around baseboards and trim. It is waterproof, flexible, and won’t shrink or crack over time, making it ideal for areas with movement or exposure to moisture. Some silicone sealants are available in different colors, making it easy to match the interior or exterior of your home.
• Hybrid sealant: If you want a paintable option, use a hybrid sealant. Our Pro Seal Max series fits the bill, offering the strength of silicone while being paintable like acrylic caulks.
• Insulating foam: Expanding foam is best for gaps and openings around attic hatches, outlets, and plumbing penetrations. It won’t warp surfaces or put pressure on surrounding materials.

These products are easy to apply and provide long-lasting protection for your home.

Seal air leaks now for comfort later

Don’t stop at the windows and doors if you’re serious about making your home more energy efficient and comfortable. Tackling those hidden air leaks can have just as significant an impact. With a tube of silicone sealant and a can of insulating foam, you can reduce drafts and enjoy a cozier home year-round.

FAQ

How can I tell if I have hidden air leaks?

In addition to feeling drafts, you can use an incense stick or infrared thermometer to identify temperature differences near baseboards, outlets, or attic hatches. Energy audits are another professional assessment option.

Should I use silicone sealant or foam?

Use silicone sealant for narrow cracks and joints, especially in finished areas. Insulating foam is better for large, irregular gaps and hidden spaces, like behind outlet boxes or around pipes.

Is sealing air leaks a good DIY project?

Absolutely! It’s cost-effective, doesn’t require expensive tools, and can be done easily. Just be sure to use quality products and follow the manufacturer’s instructions.

How often should I check for air leaks?

Ideally, once a year. Fall is a great time to inspect and seal before winter hits.

Looking for the best products for draft prevention? Find a store near you in the U.S. or Canada.