First of all, is my terminology correct? These are brands of synthetic wood alternatives:

Is “construction board” the generic name for this stuff? I think some people call them “building panels”. I ask because my search for Invidious (Youtube) vids came up short. I would rather not have a brand-dependent search query because I have to try many queries as it is to try to get this answer.

Qboard offers a factory made corner piece (called Qorner; attached to this post). I was trying to work out how I could do that myself. I’ve never worked with #constructionBoard, nor have I used a router, but I suspect they use a router to cut a “V” in the board without competely bottoming out (but nearly), so the outer skin does not get cut. Has anyone done this?

  • ciferecaNinjo@fedia.ioOP
    2·
    1 year ago

    Thanks for the feedback.

    While you could cut a V and bend the board, I would not trust it to be waterproof and you would need to seal it with the sealant anyway

    I think this is where the different kinds of boards differ. Some tests¹ demonstrate Wedi is not waterproof but Schluter KERDI and another brand is. This guy says KERDI board can be scored and snapped to fit into a car, and unfolded at installation and it maintains its waterproof properties.

    If I opt for foam board then it would probably be Wedi so indeed it would theoretically need a waterproofing system on top. I say theoretically because I don’t think the shower is waterproof to begin with (it’s apparently tile directly on concrete rendered over brick). But I should still probably practice doing it right.

    it would probably be stronger to just do a butt joint with sealant.

    I’ve noticed construction board is fastened using a big washer of sorts and a screw through it. If the board is 10—15mm thick and I use those washers on a corner, they would overhang. I suppose I could cut the overhung portions off with an angle grinder. I’m also unclear on how strong the joint is if a screw is driven just into the foam to fasten the butt joint. Wouldn’t the screw pull out without much force? Perhaps I’ll use a 2×3cm piece of wood on the inside corner and screw both boards to that since I have that wood on hand.

    Or when you say “with sealant”, do you mean no screws and sealant alone?

    1. not sure I linked the right video… I can’t access videos right now to verify.