Draft Diagnosis
How to Find Ordinary Air Leaks Around a Window
Find likely window air leaks with safe observation, classify moving and fixed joints, screen moisture and combustion risks, and record what to seal.
Read guide →A practical field guide
Map the draft. Match the material. Verify the result.
Climate-aware guidance for finding ordinary door and window drafts, choosing removable or surface-applied seals, and recognizing moisture or combustion risks.
Field guide systemObserve before acting
Use the safety screen, document the condition, and choose the lowest-risk next step.
Free guides
Start with the situation in front of you
Door Sealing
How to Choose Weatherstripping for an Exterior Door
Choose door weatherstripping by joint movement, measured gap, exposure, and label compatibility while preserving latching, egress, and combustion air.
Read guide →Weatherstrip Materials
Interior vs. Exterior Caulk Around Doors and Windows
Compare interior and exterior window caulk by joint movement, weather exposure, substrate, drainage, and label limits; know when caulk cannot fix the cause.
Read guide →Window Sealing
Reduce Window Drafts Without Replacing the Window
Reduce ordinary window drafts with a reversible-to-durable sequence: verify the leak, restore operation, use compatible seals, and preserve egress.
Read guide →Condensation & Moisture
What Condensation After Air Sealing May Be Telling You
Treat condensation after air sealing as a moisture, temperature, and ventilation signal; log the pattern, reduce sources, and know when to stop DIY.
Read guide →Combustion Safety
The Best Season for Door and Window Weather-Sealing Work
Choose caulking and weatherstripping timing from the exact product label, dry substrate, forecast, cure window, ventilation needs, and joint condition.
Read guide →