Fixing air leaks from windows starts with hunting them down through visual inspections, simple DIY tests, or professional building audits. Once you know where they are, you can fix them with sealants like caulking and weatherstripping. If you have severely outdated and drafty windows, however, it might be best to replace them with more energy-efficient ones.
Addressing leaky windows should be a top priority; otherwise, they'll contribute to poor indoor air quality (IAQ). You'll also experience reduced indoor comfort, rising home energy use, and higher utility bills. A study published in Results in Engineering even notes that windows account for about 9% of total building energy use and up to 40% of envelope heat losses.
What Are Air Leaks in Drafty Windows?
Air leaks involve the uncontrolled and unintended movement and passage of air in drafty windows. If this describes your windows, it means they have gaps and holes in their assembly or the area around their frame.
Note, however, that while drafty windows are common sources of air leaks, the most significant ones are in your attic and basement. ENERGYSTAR.gov notes these leaks can significantly drive up energy bills and make homes uncomfortable.
You'll find them in:
- Plumbing vents
- Wiring holes
- Recessed lights
- Furnace flues
- Duct chases
- Basement rim joists
How Do You Know if You Have Air Leaks at Home?
You can identify air leakage points in your house with do-it-yourself visual inspections and testing (e.g., hand test or smoke test). Professional audits are also an option.
DIY Inspections
Inspect all cracks and openings around your doors and window frames. You should pay careful attention to:
- Areas with cracked or peeling caulk
- Brittleness or missing patches of weatherstripping material
- Misalignment or warping in window sashes
- Gaps between window frames and walls
A visual inspection is usually enough to indicate the presence of air leaks, but in many cases, these problem areas hide in microscopic gaps or compressed weatherstripping. In these scenarios, you need to do more tests.
DIY Tests
If you opt for DIY testing, schedule it on a windy day. You can perform the hand test by passing your hand slowly over potential leak spots to feel if there's any incoming draft.
As for the smoke test, hold a lit candle or incense stick near areas with potential drafts and monitor the smoke for movement. If it does any of the following, it usually indicates air leaks:
- Wavers
- Looks like something is sucking it inward
- Moves to the side
Professional Home Audit
Although a paid service, a professional home audit can be worth it as it's faster and more accurate in finding hidden air leaks. Technicians use specialized infrared cameras and blower door tests to locate these problem points and give you expert guidance on addressing them.
How Can You Fix Drafty Windows at Home?
Addressing window air leaks as soon as you know they exist should be part of your home's overall winter weatherization, as prompt action can help keep your indoor living spaces comfortable. It also helps reduce moisture problems and heating and cooling costs while improving indoor air quality (IAQ).
The U.S. Department of Housing and Urban Development (HUD) even notes that with proper insulation and air sealing methods, homeowners like you can save up to 20% of your heating and cooling costs or up to 10% of your total energy expenditures.
Caulking and Weatherstripping
Caulking and weatherstripping are two of the most affordable home comfort remedies for sealing drafty windows.
Caulking involves the use of caulk, a type of flexible sealant or filler material. You can use it to seal non-moving joints on your windows and gaps smaller than 1/4 inch, such as the areas where frames meet walls.
Weatherstripping, on the other hand, is for sealing operable parts. You can use it to seal areas where the windows open and close, such as the sashes and tracks.
Window Hardware Repairs
If your windows have loose or misaligned crank handles or locks, they'll prevent the sash from pulling tightly against the seal. Even just a slight misalignment can pave the way for micro gaps where air can enter and exit.
You can restore this essential compression either by adjusting the hardware or replacing it if it's too old and beat-up.
Opting for Window Replacement
If air leaks from your windows arise from old age and severe structural deterioration and damage (e.g., rotting wood, cracked glass, or warped frames), it may be time to consider investing in a window replacement project.
Remember: Outdated and inefficient windows can compromise your home's beauty, comfort, and safety, as noted by the folks at Reece Windows & Doors. Address these problematic structures in your home by scheduling a professional consultation with window experts. They can tell you more about your window solutions and financing options.
Frequently Asked Questions
What Are the Most Common Symptoms of Air Leaks in Windows?
Feeling a breeze or "draft" near windows is among the earliest and most telling signs of air leaks. The longer they go unfixed, the higher the odds you'll see an increase in your energy bills, too.
You'll likely notice outside noise being louder, too, as sound waves and vibrations enter through the cracks and gaps. Your window glass panes will fog up, too, particularly during cool mornings and winter, when cold air from outside hits window panes warmed up by conditioned (heated) indoor air.
Are Air Leaks Completely Preventable?
No. Not 100% of air leaks affecting homes are completely preventable, although a significant percentage of them are.
One of the primary reasons for this is that your house is a dynamic structure, which ages, shifts, and settles. All these micro-movements will cause, at some point, seal degradation, cracks, and gaps.
Your home's structural components also age and weather. As they do, they'll develop flaws (e.g., shrinking and cracking in caulk and weatherstripping), leading to air leaks.
Stop Wasting Money on Hidden Air Leaks From Windows
Drafty windows may not be the biggest source of air leaks in your home, but they're still a significant contributor to these energy-wasting problems. Before they cause any more issues, hunt them down and get them repaired or, if necessary, replace severely dated, damaged ones.
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