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So I'm getting ready to start my second set of entry doors, they will be a pair of 32" wide, 96" tall half round tops. They will meet in the middle with an astrigal. I plan on using a pemko interlocking threshold. What is the best weather stripping system to use? I've looked at bronze foil and silicone bulb type. What is the best for this project?
Kip, I have never used anything but q-lon. It requires cutting a 1/8' kerf into your door stops which should be 5/16" away from the face of the door. It works well with curved jambs too.
We use 3 basic types for the perimeter of the doors - each has its good and bad. Q-Lon as mentioned, is a pretty good seal, and is easy to remove for painting, etc. However it is a mushy stop and sometimes makes for loose latches - more so in paired units. If the curve is strong enough, it can pucker and make gaps. Since it contacts the face of the door, v-joint board doors don't seal well.
Silicone bulb types that go into the corner of a rabbetted jamb are good seal if the clearances are all made accurately. We like the one that has the trick router that puts a channel in the corner of the jamb rabbet. The bulbs are in 3 sizes - or more - so it easy to get one that mates to the gaps you have.
Spring Bronze is considered a premium, so its drawback is cost, and the fact that it has to be hand nailed after all installation and finishing. Tedious, it requires some skill to keep it from buckling. Plan on almost a day per door - more than most guys can stand. It can also whistle like a kazoo if it is not tight to the door and the wind blow right.
The door bottoms are a vinyl bulb on the door that mates to an adjustable oak riser in an Endura type aluminum sill, or brass and bronze interlock on an Oak sill, or a large bronze threshold with the interlock built in. Somewhat tricky to use, but among the best for prevention. Pemko has most of this stuff.
There is also the European type of rabetted edge doors with their proprietary weatherstrip that is probably superior, as well as the sill for the same type of door. This requires a certain type of door and jamb construction that may not be what most people expect.
We like to use the silicone rubber flipperseals from Resource Conservation Technology. They have a barb that fits into a 1/8" sawkerf in the stop. I never cared for the Q-lon's fat and mushy look/feel and think the vinyl doesn't hold up as well.
RCT as well as Pemco and some others offer an active door sweep that drops down a double rubber seal as the door closes. They require a large dado in the door bottom, but they work well. I also use a simpler RCT double silicone sweep (WS56) that fits in an aluminum track in a smaller dado. It works well as long as the clearance is set correctly.