I’m going to be residing my house with wood clapboards (the old stuff has been too abused by painting crews to keep) and I’m tempted to use the PVC stuff for trim. Based on the posts in here, I get that PVC moves both ways when heated, but is that movement enough to tear out chalk seams along the wood/PVC joint or will the two of them work ok together? Thanks for any advice you can provide. (Oh, I live in the Northeast outside of Boston.)
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not that much movement in that direction...
a good caulk with good elastcity will do fine
DAP DynaFlex 230 is one of my favorites
I used that DAP 230 caulk on my house years ago, and have stripped it down for new siding. That caulk is good as day one and is tough as a semi truck tire. Serious adhesion. I've been using geocell tripolymer ths time though. It's pretty good stuff, but just plain nasty to get off anything.
I used the Geocel before and it is very good. We used to use that back in the 90's when we used LP siding and the one house we stripped off the LP (old batch with all the claims) we had a heck of a time getting the siding off the windows. The caulking held that stuff tight
I live in the same area. I used PVC to replace door pillasters and corner boards. The pillasters were done 4 years ago and the caulk between the PVC and clapboards is in great shape. Did a 17 + foot corner trim board a year ago and it's joint is fine...no movement detected...I used the DAP Dynaflex 230 elastomeric caulk. Also retrimmed a back door with PVC and Dynaflex....it has a southern exposure and it gets baked...no movement. I have use AZEK brand PVC. Good luck.