We need to replace a wood threshold which has dryrot. Is there a wood free plastic threshold that we could use for this application? Are there disadvantages?
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I generally use white oak or cedar, but there are some composites available that should work. You'll probably need at least a 2x8 for the threshold.
Yout best bet is to go to a real lumber yard, not one of the boxes, and talk to one of the sales people there.
Also, whenever I use any kind of wood outside, I prime all the surfaces, except those that may get glued. It greatly helps the wood last longer.
I can call my lumberyard and order a modern threshold, the kind that are part and parcel of a new exterior prehung package, with an adjustable strip.
but I suspect that you might have more than just dry rot in the thresh. The sill under it is likely also suffering, so be preparered.
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As piffin, I call my supplier and order a stock factory adjustible threshold. Some of the companies offer a composite substraight instead of "treated" wood. I'll also order the vinyl sweep and dado the splines in the bottom of the door,using a rip fence on the circular saw. Adjust the flange locations so you use one rip setting. Installed carefully with the proper sealant and flashings, modern technology in a retrofit.
Still, nothing beats a nice job on an all wood set up.Remodeling Contractor just outside the Glass City.
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check out ipe' (ironwood)