Is this too large a gap at the top of tile backer board? The board is secured in place so can’t easily replace it so thinking I could fill it with silicone or put in a thin piece.
I am curios if this is doable or would work. I have a small single skin block shed. Now I am wondering if you can use foam tile backer board like Q Board dot and dabbed to the wall as both the vapor barrier, insulation and paneling without using plasterboard? This panel is meant for wet rooms...