J. Bos Inc. Roofing Services
Air leaks are one of the biggest contributors to heat loss during winter. When warm air escapes from inside the home, cold air is pulled in to replace it. This creates drafts, drives energy bills higher, and puts additional stress on your roof by creating uneven attic temperatures. Sealing these leaks stops heat from reaching the roof deck and reduces the chance of ice dams forming in freezing conditions.
Here is how to locate leaks and what to do about them.
Why Sealing Leaks Matters for Your Roof
When indoor heat escapes into the attic or exterior walls, snow on the roof melts faster than intended. That runoff refreezes at the roof edge, and repeated freeze-thaw cycles allow water to push beneath shingles over the winter season. Sealing leaks helps your attic remain cold and dry, which protects shingle integrity and prevents water infiltration.
Where to Check for Air Leaks
Windows
• Look for cracked caulking or loose trim
• Inspect the frame for gaps and cold drafts
• Ensure the window locks tightly
Old caulk becomes brittle and fails to block airflow.
Doors
• Run your hand around the door seal to detect cold spots
• Replace worn weatherstripping that has flattened or cracked
• Check thresholds for daylight coming through
Heat loss at hinges and jambs is common in older homes.
Attic Openings
• Add weatherstripping around pull-down stairs
• Apply insulation to attic access panels
• Ensure gaskets are intact around attic kneewall doors
This is typically the largest single leak area in the home.
Exhaust Vents and Utility Penetrations
• Seal around dryer vents, bath vents, and plumbing lines
• Confirm seals remain tight where HVAC ducts exit the home
These openings allow more heat escape than homeowners expect.
Basement Rim Joists
Cold air sneaks into the lower level and travels upward into living spaces. Spray foam insulation is the most effective fix.
What Materials to Use
Choosing a quality product determines how long the repair lasts.
• Exterior-grade caulk for siding, trim, and window exteriors
• Interior latex caulk for small indoor gaps
• Weatherstripping for door and operable window edges
• Expanding foam for large openings or rim joists
Winter prep does not require a full renovation. Focus on the most active problem zones first for immediate results.
When a Professional Should Step In
• Persistent drafts from multiple locations
• Moisture forming around windows or vents
• High heating bills year after year
• Noticeable temperature differences between rooms
A full ventilation and insulation evaluation ensures the entire home is working as a unified system.
Next Step:
Homeowner’s Guide to Winterizing Your Home
Request a winter readiness review:
https://jbosroofingservice.com/contact-us/
