As a beginner, I'm trying to install marble windowsills, but I'm a bit stuck.
What do you do when the OSB substrate is uneven if you're going to install a marble windowsill?
Using filler is probably not okay since the OSB will absorb moisture?
Even harder question,
what do you do if the substrate is GYPSUM? Then you probably have to remove the gypsum, or screw on another layer of OSB?
Why can't you mount it on drywall? They are glued on, I assume.
Sure, that's a bit crooked but not by much, what kind of level do you have?
It might be enough to just place a small piece of milk carton in between to level it out.
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