New answers tagged waterproofing
Regardless of which method you use to finish your basement, if there is a water/moisture issue, get that fixed first. If there is dampness or water entering your basement, no matter what you system you use, it (water) will continue to find its way into the living area.
If you are not attached to cedar shingles then I would say use a metal roof. If your metal overlaps both pieces enough then you can get a pretty water tight seem just due to the overlap of the metal. Though taking it apart too much will bend the metal. I suppose if you attached all your shingles to plywood that hangs over in a similar fashion you might get ...
If the two halves of the shed are built to be structurally sound while separate, then there is no reason that each roof can't be built slightly asymmetrically so that one overlaps a portion of the other to provide weatherproof protection, like this: Some tweaking of the interface would be needed to make it practical and convenient, but the basic idea ...
A bathroom should have water resistant materials in the places likely to be splashed with water. Stanard drywall is not used in those locations, but rather hardboard or cement board should have been used. If the proper materials were used in the first place, then you can just prime and paint over them. What @Ecnerwal is saying in his comment applies more ...
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