If your home always seems to have a cold spot, a chilly floor, or a mysterious breeze—even when the windows and doors are closed—you may have a drafty house.
Drafts aren’t just uncomfortable. Unwanted air leaks can make your heating and cooling system work harder, contribute to uneven temperatures, and increase energy costs. The good news is that once you identify where the air is coming from, you can take steps to improve your home’s comfort and efficiency.
Here are 10 common causes of a drafty house.
1. Gaps Around Windows and Doors
Windows and exterior doors are some of the most common places for air to enter a home. Over time, weatherstripping, caulking, and seals can deteriorate, leaving small gaps where outside air can sneak in.
2. Poorly Insulated Attic
Your attic plays a major role in your home’s energy efficiency. If insulation is missing, compressed, damaged, or insufficient, heated or cooled air can escape through the ceiling and outside air can enter.
3. Air Leaks Around Electrical Outlets
Exterior walls can have small gaps around electrical outlets, switches, and other penetrations. While each opening may be small, numerous leaks throughout a home can add up.
4. Recessed Lighting
Older recessed lights can create openings between your living space and attic. Depending on the fixture, these openings can allow conditioned air to escape into the attic.
5. Gaps Around Plumbing and Wiring
Pipes, electrical wiring, ductwork, and other utilities often pass through walls, floors, and ceilings. The openings around them aren’t always properly sealed, creating pathways for outside air.
6. Poorly Sealed Basement or Crawl Space
Basements and crawl spaces can be significant sources of drafts. Gaps around foundation walls, rim joists, windows, and utility penetrations can allow cold outdoor air into the home.
7. An Uninsulated Rim Joist
The rim joist is the area where the foundation meets the home’s framing. Because it contains numerous seams and penetrations, it can be a major source of air leakage if it isn’t properly insulated and sealed.
8. Aging or Damaged Insulation
Insulation doesn’t necessarily remain effective forever. Moisture, pests, remodeling projects, settling, or damage can reduce its effectiveness and leave areas of your home poorly insulated.
9. Ductwork Leaks
If your HVAC ductwork runs through an attic, basement, crawl space, or other unconditioned area, leaks can allow conditioned air to escape before it reaches the rooms where you need it.
10. Poorly Sealed Building Envelope
Sometimes the problem isn’t one obvious leak—it’s dozens of small ones. Gaps around windows, doors, walls, the attic, basement, plumbing, wiring, and other penetrations can collectively make a home feel drafty.
How Can You Fix a Drafty House?
The first step is finding out where the unwanted air is entering. Some problems can be addressed with weatherstripping or caulk, while larger air leaks may require professional insulation and air-sealing work.
Spray foam insulation can be particularly useful for sealing irregular gaps and hard-to-reach areas while providing insulation at the same time. A professional can evaluate areas such as attics, rim joists, basements, and crawl spaces to determine where improvements may make the biggest difference.
If your home feels drafty despite your HVAC system running normally, don’t assume you simply need a larger furnace or air conditioner. The problem may be your home’s insulation and air sealing.
Ready to find out what’s causing the drafts? Superior Spray Foam can help identify areas where your home may be losing conditioned air and recommend the right insulation and air-sealing solution. From attics and basements to crawl spaces and rim joists, our spray foam solutions can help create a more comfortable, energy-efficient home.
Don’t spend another season fighting drafts. Contact Superior Spray Foam today to schedule an evaluation and take the first step toward a more comfortable home.
FAQ: Drafty Houses
Why is my house drafty even with new windows?
New windows can reduce drafts around the window itself, but they can’t eliminate air leaks elsewhere in the home. Attics, doors, electrical penetrations, rim joists, crawl spaces, and other areas can still allow outside air to enter.
How do I find where drafts are coming from?
Start by checking obvious areas such as exterior doors, windows, attic access panels, basements, and crawl spaces. A professional energy assessment or air-leakage test can help identify less obvious sources.
Does insulation stop drafts?
Insulation helps slow heat transfer, but insulation alone doesn’t necessarily stop air movement. Effective air sealing is often an important part of addressing drafts.
Can spray foam insulation help with a drafty house?
Yes. Spray foam can help seal gaps and cracks where unwanted air is entering while also providing insulation. It is commonly used in areas such as rim joists, attics, crawl spaces, and other difficult-to-seal locations.
Why is my house colder in the winter than in the summer?
Cold outdoor air can enter through gaps and air leaks during winter, while heat can enter through those same weaknesses during summer. Poor insulation and air sealing can make it harder for your home to maintain a comfortable temperature year-round.
Will fixing drafts lower my energy bills?
Reducing unwanted air leakage can help your HVAC system operate more efficiently because less conditioned air is lost. The potential savings vary depending on the size and location of the leaks, your home’s insulation, and other factors.
Should I add more insulation or replace my existing insulation?
It depends on the condition and location of your current insulation. In some cases, adding insulation is appropriate. In others, the bigger problem is air leakage or damaged insulation. A professional assessment can help determine the best approach.
