Installing V-strip on a Door Frame
Last lesson was the pitch for why I skip the felt stuff. This one's the actual install, so get your V-strip, a utility knife, a tape measure, and a screwdriver or a little hammer depending what kind you bought.
Quick refresher on what we're doing. V-strip (some people call it tension seal) is a strip of vinyl or metal folded into a V shape. You tack or stick it to the door frame, the V springs open a little, and when the door closes it presses flat against the door and seals the gap. No compression over time like felt, because the spring in the V is doing the work, not the material itself. That's the whole advantage.
Step one, clean the frame
Wipe down the door stop, the part of the frame the door actually closes against. Get the dust and old caulk crumbs off. If there's old weatherstripping already on there, pull it off and scrape the residue with a putty knife. You want a clean, flat surface. V-strip won't stick right to a dirty frame, and if you're nailing it instead of using adhesive, you still want it sitting flush.
Step two, measure and cut
Measure the two sides and the top of the frame separately. Don't try to run one long piece around a corner, it won't sit right. Cut three pieces with a utility knife. Cut them a hair long rather than short, you can always trim after, you can't add back.
Step three, position the strip
Here's the part people get wrong. The V opens toward the inside of the house, so the fat part of the seal faces into the room and presses against the door when it swings shut. If you put it on backwards it won't seal at all, the door will just push right past it.
Set the strip against the door stop with the V facing the right way, and close the door gently to check the fit before you commit to nails or adhesive. You want it snug enough that you feel resistance when the door shuts, not so much that the door won't latch. If your door's dragging or not latching clean already, go back and sort that out first, this isn't the fix for a door that's out of adjustment. Weatherstripping seals a door that's already working right.
Step four, attach it
If it's the nail-on kind, there'll be small nail holes pre-punched or you'll tack through the flat edge every six inches or so. Little hammer, little nails, don't overdrive them or you'll crack the vinyl. If it's adhesive-backed, same idea, press it on firm and work your way down so it doesn't bubble.
Do the two side jambs first, then the top piece last so the corners overlap clean.
Step five, test it
Close the door slow and watch where it makes contact. Then close it normal speed like you would any day. It should shut without you having to shove it, and there shouldn't be daylight or a draft anywhere along the edge. If one spot's not sealing, the strip's probably not seated tight there, or the door's slightly warped and you'll need a touch more spring in the V at that spot.
I'll say the opinion again since it's the whole reason we're doing it this way instead of the cheap stuff: V-strip costs a couple bucks more than felt, but felt goes flat in one season and you're back at the store buying more. Do it once, right, and forget about it for years.
This one's quick to do, which is part of why I like it. Twenty, thirty minutes a door if the frame's already clean. I did one for a friend from the ward without even meaning to make a project of it. I was over there for a whole different job, framing a deck addition for him at cost, and on my way in and out I noticed his front door dragged on the threshold and had a gap along the latch side you could feel air through. So while I had my truck there I fixed the drag and threw a strip of V-strip on the frame. Didn't say anything about it. He noticed a few weeks later when the house felt different in a cold snap and asked me what changed. That's kind of how these small jobs go. Nobody throws a party over weatherstripping, but you notice when it's not there.
One real caution: if you're using the metal spring-type V-strip instead of vinyl, the edges can be sharp where it's cut. Watch your fingers running your hand along it to check the seal.
Before next time: grab the measurements for your own door frames, if you've got more than one exterior door, and figure out which kind of V-strip you want to buy, adhesive or nail-on. We'll do a second pass next lesson on door sweeps, which is the other half of sealing a door up right.