Caulking & Weatherstripping Checklist

Inspect all windows and exterior doors for air leaks. Use the incense stick or candle test — hold a lit stick near window and door edges on a windy day and watch for flame or smoke deflection indicating drafts. Check existing caulk on all exterior window and door frames for cracks, gaps, or separation. Examine weatherstripping on all doors and operable windows for compression set, tearing, or missing sections. Check under exterior doors for visible daylight between the door bottom and threshold.

1. On a windy day, hold lit incense or candle near window edges and watch for smoke movement

2. Check all four sides of every exterior window frame for cracked or missing caulk

3. Inspect weatherstripping on all entry doors — close door on a dollar bill and pull; if it slides easily, seal is inadequate

4. Check weatherstripping on operable windows at meeting rails and sides

5. Look for daylight under exterior doors with interior lights off

6. Check where different materials meet (siding to window trim, foundation to sill plate)

7. Feel for drafts around electrical outlets and switch plates on exterior walls

- Caulk cracked from age and UV exposure — loses elasticity and pulls away from surfaces

- Weatherstripping compressed flat from years of use — no longer makes contact with door/window

- Gaps at corners where two caulk beads should meet — most common leak location

- Air infiltration around electrical boxes on exterior walls — often overlooked source of drafts

Remove all old cracked and deteriorated caulk using a utility knife, 5-in-1 tool, or oscillating multi-tool with a scraper blade. For stubborn caulk, apply a commercial caulk remover and let it soften for the recommended dwell time. Peel off all old weatherstripping from door and window frames. Clean all surfaces with isopropyl alcohol to remove residue and ensure proper adhesion of new materials. Surfaces must be clean, dry, and free of debris.

1. Score along both edges of old caulk with a utility knife

2. Pull or scrape old caulk away from the joint

3. Apply caulk remover to stubborn sections and allow dwell time per product directions

4. Scrape remaining residue with a plastic putty knife (avoid scratching painted surfaces)

5. Peel off old weatherstripping from all door and window frames

6. Remove adhesive residue with isopropyl alcohol or adhesive remover

7. Clean all surfaces where new caulk or weatherstripping will be applied

8. Allow surfaces to dry completely before applying new materials

- Applying new caulk over old cracked caulk — new caulk will not bond to old caulk surface

- Not removing adhesive residue — new weatherstripping adhesive fails to stick

- Gouging wood trim while removing old caulk — use plastic tools on painted surfaces

- Applying new materials to damp surfaces — adhesion failure within weeks

Select the correct caulk type for the application: paintable silicone or polyurethane for exterior joints (best flexibility and weather resistance), acrylic latex for interior joints where painting is desired. Cut the caulk tube tip at a 45-degree angle to a size that matches the joint width. Apply a continuous bead in one smooth motion, filling the joint completely. Smooth immediately with a wet finger, wet caulk tool, or damp rag for a clean finish. Exterior caulk joints should be at least 1/4 inch wide and 1/4 inch deep for proper adhesion.

1. Select caulk type: polyurethane or silicone for exterior, acrylic latex for interior

2. Cut tube tip at 45-degree angle — opening diameter should match the joint width

3. Load caulk gun and puncture inner seal with the built-in rod

4. Apply bead in one continuous motion at a steady pace

5. Fill the joint completely — bead should slightly overfill the gap

6. Smooth with a wet finger or caulk finishing tool immediately (within 2-3 minutes)

7. Wipe excess from adjacent surfaces with a damp rag

8. Check that joint is fully sealed with no gaps or voids

- Cutting tip opening too large — caulk overflows the joint and creates a mess

- Stopping and starting the bead — creates lumps and weak points in the seal

- Not smoothing the bead — leaves rough uneven appearance and traps moisture

- Using interior latex caulk on exterior joints — deteriorates within one season from UV and moisture

For windows, use V-strip (tension seal) bronze or plastic for double-hung window channels, or adhesive-backed foam or rubber compression tape for casement windows. For door frames, apply adhesive-backed foam or rubber compression weatherstripping to the door stop (the part the door closes against). The seal must be tight enough to block air when the door is closed but not so tight that it prevents the door from latching properly.

1. Measure door or window frame sections and cut weatherstripping to exact length

2. For windows: apply V-strip into the channel where sashes slide, with the V opening facing outside

3. For door frames: apply adhesive-backed foam or rubber to the door stop surface

4. Clean application surface with alcohol first for best adhesive bond

5. Press weatherstripping firmly along its entire length — no gaps or lifted sections

6. Close door or window to test seal — should feel slight compression resistance

7. Verify door latches properly — if it will not close, weatherstripping is too thick

8. Check all four sides of each door and three sides of each window (top, sides)

- Weatherstripping too thick — door will not latch or requires excessive force to close

- Adhesive-backed strip not pressed firmly — peels off within days

- Gaps at corners where strips meet — most common remaining leak point

- Using foam on high-friction areas — foam wears through quickly, use rubber or silicone instead

Measure the width of each exterior door and cut the door sweep to fit exactly. Position the sweep on the interior face of the door so the rubber or brush element barely touches the threshold when the door is closed — it should lightly drag but not impede door movement. Mark screw hole locations, pre-drill pilot holes, and attach with the provided screws. Test the door operation after installation.

1. Measure door width at the bottom edge

2. Cut door sweep to exact width with a hacksaw (for aluminum channel) or heavy scissors (for brush type)

3. Close the door and hold the sweep against the interior face with rubber touching the threshold

4. Mark the screw hole positions with a pencil

5. Open the door and pre-drill pilot holes at marked locations

6. Attach sweep with provided screws — center the slotted holes for later adjustment

7. Close door and check that sweep contacts threshold evenly across full width

8. Open and close door several times to verify smooth operation

- Sweep too long — drags on floor and prevents door from opening, trim to fit

- Sweep mounted too low — door is difficult to open and close, wears sweep prematurely

- Sweep mounted too high — gap remains between sweep and threshold, air still leaks

- Not pre-drilling pilot holes — screws split the door bottom edge

After completing all caulking and weatherstripping, retest all sealed areas using the same incense or candle test used during initial inspection. Verify all doors and windows open and close freely without excessive resistance. Check for visible daylight around closed exterior doors. For a more precise assessment, consider a professional blower door test which pressurizes the home and measures total air leakage in ACH (air changes per hour).

1. Repeat incense or candle test at all previously identified draft locations

2. Verify each sealed joint shows no smoke deflection or flame flicker

3. Test all doors for proper operation — open, close, and latch smoothly

4. Test all windows for proper operation — open, close, and lock without binding

5. Turn off all interior lights and check for visible daylight around exterior doors

6. Check that weatherstripping makes even contact on all sides (dollar bill test)

7. Compare indoor comfort level and note any reduction in drafts

8. Monitor energy usage over the following month to gauge improvement

- New weatherstripping too tight — doors and windows bind and do not close properly

- Missed gaps at corners and transitions — most common remaining leak points

- Caulk not fully cured when testing — some types need 24-48 hours to fully set

- Expecting dramatic energy savings from caulking alone — caulking is one part of overall air sealing; attic and basement bypasses are typically larger sources of air leakage