How to Replace Weatherstripping

Overview

Worn or missing weatherstripping is a major source of energy waste in homes, allowing conditioned air to escape and outdoor air to enter. Replacing weatherstripping is an inexpensive DIY project that can reduce energy bills by 10-15% and significantly improve home comfort. This guide covers how to choose and install the right weatherstripping for your doors and windows.

Why This Matters

Air leaks around doors and windows can account for 10-25% of your heating and cooling costs. Replacing worn weatherstripping is one of the most cost-effective energy improvements you can make, typically paying for itself in one heating or cooling season. Proper weatherstripping also reduces drafts and improves comfort.

Types of Weatherstripping

V-Strip (Tension Seal)

Best for: Double-hung and sliding windows, some doors

• Pros: Durable, effective, invisible when installed
• Cons: Requires precise installation
• Installation: Fits into track or groove

Adhesive-Backed Foam

Best for: Most doors and windows, irregular surfaces

• Pros: Easy to install, affordable, versatile
• Cons: Less durable, may need replacement more often
• Installation: Peel and stick

Felt Weatherstripping

Best for: Budget option, low-traffic areas

• Pros: Very inexpensive, easy to install
• Cons: Less durable, compresses over time
• Installation: Nail or staple in place

Door Sweeps

Best for: Bottom of doors

• Pros: Very effective for bottom gap
• Cons: Can drag on floor if not adjusted
• Installation: Screw to door bottom

Tubular Rubber/Silicone

Best for: Doors, high-traffic areas

• Pros: Very durable, excellent seal
• Cons: More expensive, requires mounting strip
• Installation: Attach mounting strip, then insert tube

Step 1: Assess Current Weatherstripping

Check All Doors and Windows

Look for:

• Cracked or missing weatherstripping
• Compressed material (no longer springs back)
• Gaps where air can pass through
• Loose or peeling weatherstripping

Test for Air Leaks

Methods:

• Feel for drafts - Run hand around edges
• Use candle - Watch for flame movement
• Check with paper - Should be difficult to pull through closed door/window

Step 2: Remove Old Weatherstripping

For Adhesive Types

1. Peel off carefully
2. Use heat (hair dryer) if stubborn
3. Remove adhesive residue with appropriate cleaner
4. Clean surface thoroughly

For Nailed/Stapled Types

1. Remove fasteners carefully
2. Pull off weatherstripping
3. Fill holes if needed
4. Clean surface

For V-Strip

1. Pull out from track
2. Clean track thoroughly
3. Ensure track is in good condition

Step 3: Measure and Cut

Accurate Measurements

For doors:

• Measure each side separately
• Measure top separately
• Add 1/4 inch for overlap at corners

For windows:

• Measure each sash or frame section
• Account for corners and joints
• Cut slightly long - Can trim if needed

Cutting Tips

• Use sharp utility knife or scissors
• Cut at 45-degree angles for corners
• Test fit before final installation

Step 4: Install New Weatherstripping

Adhesive-Backed Foam

1. Clean surface thoroughly (alcohol works well)
2. Peel backing gradually as you apply
3. Press firmly as you go
4. Avoid stretching - Apply with slight compression
5. Smooth out any bubbles or wrinkles

V-Strip

1. Insert into track or groove
2. Ensure proper orientation (V opens toward seal)
3. Cut to length carefully
4. Test door/window operation

Door Sweeps

1. Measure door width
2. Cut sweep to size (slightly shorter)
3. Mark screw holes
4. Drill pilot holes if needed
5. Attach with screws
6. Adjust height so it just touches threshold

Tubular Rubber

1. Attach mounting strip first
2. Insert rubber tube into strip
3. Cut to length at corners
4. Test operation - Should compress slightly when closed

Step 5: Test and Adjust

Check Seal

After installation:

1. Close door/window
2. Feel for drafts around edges
3. Check operation - Should open/close smoothly
4. Adjust if needed - May need to reposition

Common Adjustments

If too tight:

• Reposition slightly
• Trim if necessary
• Check for proper compression

If too loose:

• Add additional weatherstripping
• Check for gaps
• Ensure proper contact

Common Mistakes to Avoid

Wrong Type

Don't: Use interior weatherstripping for exterior Do: Match type to application and location

Poor Preparation

Don't: Install over dirty or damaged surfaces Do: Clean and prepare surfaces thoroughly

Incorrect Installation

Don't: Stretch or compress too much Do: Follow manufacturer instructions for proper tension

Skipping Corners

Don't: Leave gaps at corners Do: Overlap or miter corners properly

Maintenance

Regular Checks

• Inspect annually for wear or damage
• Test for drafts seasonally
• Replace when compressed or damaged
• Clean as needed to maintain effectiveness

When to Replace

Replace weatherstripping when:

• Visible damage (cracks, tears)
• No longer compresses properly
• Drafts are present despite installation
• Adhesive fails (for adhesive types)
• Material is 5+ years old

Cost Considerations

DIY replacement:

• Adhesive foam: $5-$15 per door/window
• V-strip: $10-$20 per window
• Door sweep: $10-$25
• Total: $50-$150 for typical home

Professional service:

• Per door: $75-$150
• Per window: $50-$100
• Full house: $500-$2,000+

When to Call a Professional

Consider professional help if:

• Windows/doors are very old or unusual
• You're uncomfortable with installation
• Multiple units need replacement
• You want warranty on work

Prevention Tips

• Choose quality weatherstripping (lasts longer)
• Install correctly the first time
• Maintain regularly - Clean and inspect
• Replace promptly when worn
• Use appropriate type for each application

Conclusion

Replacing weatherstripping is a simple, cost-effective way to improve your home's energy efficiency and comfort. The key is choosing the right type for each application and installing it properly. With basic tools and attention to detail, you can achieve professional results and see immediate improvements in energy bills and comfort.