New answers tagged moisture
You definitely should install an exhaust vent in the room for humidity and buy a quiet one so you will actually use it. But if you don't it will be like every other 6'-0"x5'-6" laundry room with a vent that is not on; point is not the end of the world. As for the rest, install your required utities and fixtures for the appliances (power, water, sewer, ...
All dryers need a vent. Gas and electric dryers need a vent to the outside of the house to allow all the moisture to escape from the dryer. All-in-one washer/dryer combo units don't need an air vent, but need a water drain to remove the water from the drying stage (which you need anyways to drain the wash cycle). The walls are irrelevant. So don't worry ...
55% has been the magic number for me when the humidity is at it's heaviest (with outside temp at about 80 degrees) With my window air conditioner (8000 btu) and a couple of fans to keep the air circulating, it manages to cool my 1500 sq. ft. open living area very well in about an hour of turning everything on. It's not cold but comfortable.
You have a leak - that's what causes moist drywall in virtually all cases. The rust is presumably coming from drywall nails/screws or other nails or steel/iron in the wall. Without fixing the leak first, no repair will last. Once you get the leak fixed you can coat the wall with a "stain-blocking primer" (often shellac based) to stop the rust stains from ...
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