Why I Skip the Cheap Felt Weatherstripping
New module. We've done doors, we've done sliding doors and windows. Now we're on weatherstripping specifically, because this is honestly where you get the most for the least amount of work. A ten-dollar door sweep or a roll of the right stripping will do more for a drafty house than almost anything else on this list. This is the whole reason I do my walk-through every October.
So let's start with an opinion, since I've got one and it's a little contrarian. Skip the felt.
What's wrong with felt
You've seen it. It's the cheap stuff on a roll at the hardware store, usually with a strip of adhesive backing, sometimes stapled on. It's everywhere because it's cheap and easy to find, and that's exactly the problem. It compresses flat in about one season. You close the door on it a few hundred times and it just gives up. By the second winter it's not sealing anything, it's just a strip of fuzz doing nothing.
I know because Jason and I found this out the hard way on his garage service door. He'd bought a roll of felt weatherstripping before I got there, good intentions, wrong material. We put in a whole Saturday afternoon on it. Cut it, stapled it, got it looking decent. Closed the door a bunch of times to test it and you could already feel it packing down under the staples. We looked at each other and just knew. Tore the whole thing back off and drove to get V-strip instead. Did it right the second time. I still give him grief about the felt every time I'm over there.
What to use instead
I like V-strip, sometimes called tension seal. It's a strip of vinyl or metal folded into a V shape, and the shape itself is what seals, not just the material squishing down. It flexes when the door closes and springs back after. That's the difference. It doesn't rely on staying compressed, it relies on doing the same job over and over.
For door bottoms, a rubber door sweep beats felt every time too. Same idea. Rubber flexes and recovers. Felt just mats down.
This is a preference, not gospel. Some people do fine with foam tape for small gaps around windows that don't get a lot of movement. But for anywhere that opens and closes regularly, a door especially, I'm going V-strip or rubber, every time. Spend the couple extra bucks. You're not redoing this next winter.
How to actually put V-strip on a door
- Close the door and look at the gap between the door and the frame, all the way around. That gap is what you're sealing.
- Cut the strip to length with a utility knife, one piece for each side. Measure twice, this stuff isn't cheap enough that you want to waste it guessing.
- Peel the backing a little at a time as you go, don't strip the whole thing off at once, it'll want to fold on itself.
- Press it into the frame so the V faces the door, tension side out, so it flexes when the door shuts against it.
- Close the door and check. You want light contact, not a fight to get the door shut. If it's too tight you'll wear it out fast and annoy yourself every day.
Takes maybe twenty minutes a door once you've done one.
A quick diagnostic detour, because this matters here too
Before you go buy anything, actually check what's causing your draft. Sometimes it's not the weatherstripping at all.
Braden from the ward called me over once because his sliding door was sticking bad, and he was ready to just buy a whole new door. I got down and looked at the track and it was packed solid with ten years of dog hair and grit, that gray felted mess that builds up when nobody's ever cleaned it out. Vacuumed it, wiped it down with a rag, and the door slid like new. No weatherstripping, no hardware, nothing. Just dirt.
Same principle applies here. Feel around your door and window frames for actual air movement before you assume the stripping's the problem. Sometimes the stripping's fine and there's just a gap somewhere else, a crack in the frame, a threshold that's pulled away. Diagnose first. Don't throw parts at it till you know what's wrong.
A caution while you're at it
If you're prying old felt or foam stripping off with a putty knife, go slow near painted trim. The old adhesive likes to pull paint with it, and then you've got a repair job you didn't sign up for. Score along the edge with a utility knife first if it's stubborn.
Before next time
Go feel around one door in your house on a windy day, hand a few inches from the frame, and see if you can find where the draft's actually coming from. Don't fix it yet. Just find it.