How can I prevent filler cracking on wainscoting joints due to walls expanding and contracting, and what alternatives are there for uneven corners without using trim?
Asked by Annette Cruz 
4 months ago
Last Updated: July 26, 2024
Hey, so I decided to give wainscoting and panel boards a try for the first time. Let me tell you, the internet made it seem way easier than it actually is! I ended up running into some issues – the seams didn’t line up on a stud, so I used adhesive, finish nails, and filler to try and fix it. But now, with the walls expanding and contracting, the filler has cracked at all the joints. Any tips on how to prevent this from happening again?
Oh, and I’m also not sure what to do at the corners since the walls aren’t straight. I’d rather not use trim if possible. Any suggestions on how to tackle this?
It’s best to use a flexible filler. But it seems like that corner wasn’t cut snugly enough. Keep in mind that excessive caulking will shrink significantly as it dries.
Alright Sandy, I can easily resolve that issue by taking out the small filler strip and crafting new, larger pieces.
When working on wood projects, remember that glue is your ally.
Fresh caulks have great flexibility.
I prefer to measure the widest gap and divide it in half. So, if it’s 1/2 inch, adjust your table saw to remove 1/4 inch from the bottom, tapering to zero at the top. This ensures your panel stays square and minimizes the gap that needs filling.
You could consider using Alex Flex caulking, it might be flexible enough.
Did they use prefabricated panels or a “kit” for this?
Mentioned it was pre-made.
When you get to corners, you need to make a mark. If you’re not sure what that means, you might be in too deep to get out.