Weatherstripping Replacement

Why this matters

Weatherstripping at doors and windows is the cheapest energy-efficiency upgrade in a home. A worn weatherstrip on a typical exterior door admits enough air through gaps to equal a 1-inch hole open continuously - draft, lost heat, lost cool, higher utility bills, comfort complaints. Replacing weatherstripping is 30 to 60 minutes per door at a modest in materials. Most customers don't think to ask; the handyman who walks through the home and identifies failed weatherstripping during another service call captures additional revenue and delivers a meaningful comfort improvement.

When to replace

Visible signs:

• Brittle, cracked, or missing weatherstrip
• Light visible through the closed door
• Air movement felt around the closed door
• Customer reports drafts
• Door doesn't close tightly anymore (gasket compressed)

Recommended replacement interval:

• Foam weatherstrip: 5 to 8 years
• Vinyl weatherstrip: 10 to 15 years
• Bronze or metal weatherstrip: 30+ years

Weatherstrip types

Procedure for typical exterior door

Step 1: Identify the failing components

Walk around the door:

• Top edge: weatherstripping
• Vertical edges (both sides): weatherstripping
• Bottom edge: sweep and/or threshold

Identify which components are failing.

Step 2: Choose replacement materials

For each component, select:

• Same type as original (compatible installation)
• Better-quality version if upgrading
• Specific door types may need specific materials (storm door, sliding door, fire door)

Brands: M-D Building Products, FrostKing, Stanley, Schlage.

Step 3: Remove old weatherstripping

For adhesive-backed:

• Pull old strip off
• Scrape residue with putty knife or razor blade
• Clean surface with alcohol or denatured alcohol
• Verify surface is smooth

For nailed:

• Remove old nails
• Fill any holes with wood filler if needed
• Sand smooth

For track-in:

• Lift weatherstrip out of track
• Clean track

Step 4: Measure and cut

• Measure the door edge length
• Cut weatherstrip slightly longer (1/4 inch extra)
• Cut clean (utility knife or sharp scissors)

Step 5: Install

For adhesive-backed:

• Peel backing as you go
• Press firmly against the surface
• Don't stretch the material (causes shrinkage)

For nailed:

• Position the strip
• Tack lightly at corners
• Drive nails (typically 4 to 8 inches apart)
• Don't over-drive (compresses the material)

For track:

• Slide into track
• Verify it sits properly

Step 6: Door bottom (sweep or threshold)

Sweep:

• Old sweep removal: unscrew or pull off
• Position new sweep at door bottom
• Mark mounting holes
• Drill pilot holes
• Mount with screws

Threshold:

• More complex; involves the floor framing
• Remove old threshold by unscrewing or prying
• Position new threshold
• Verify alignment with door
• Mount per manufacturer (some screw into floor; some use adhesive)
• Verify door clears the threshold when closing

Step 7: Test the door

• Close the door
• Check for drafts (hand at the edge during fan-on indoor; or light test - shine flashlight on door from outside in dark interior, look for light)
• Adjust if needed (sometimes weatherstrip is too thick; trim)

Step 8: Verify operation

• Door opens and closes normally
• Latch engages
• Lock works
• No binding or rubbing

Common door scenarios

Standard exterior wood door

• Weatherstripping on all 3 sides (top, both verticals)
• Sweep at bottom
• Threshold under door

Storm door

• Magnetic weatherstrip around perimeter
• Bottom sweep
• Specific products for storm doors

Sliding glass door

• Weatherstripping in tracks
• More complex; sometimes specialty parts required

French doors

• Multiple doors; each with its own weatherstripping
• Astragal at the meeting point

Window weatherstripping

Most windows have built-in weatherstripping; replacement is sometimes possible:

• Casement windows: tubular vinyl in track
• Double-hung windows: pile weatherstripping in jamb track
• Slider windows: track-based weatherstripping

Window weatherstripping replacement is more skilled; some weatherstripping is integrated and requires window-specific parts.

Common mistakes

• Stretching weatherstrip during install: shrinks after install; gaps appear
• Wrong type for the door: doesn't seal properly
• Adhesive on dirty surface: doesn't bond; falls off
• Compressed weatherstrip during install: door won't close properly
• Not testing the door before leaving: customer discovers issues later

References

• Manufacturer literature: M-D Building Products, FrostKing, Stanley, Schlage.
• IRC R609 (Window/door installation, related).
• Energy Star guidance on weatherization.
• Manuall internal: Universal Building Envelope Fundamentals.