New answers tagged moisture
You don't mention where you live so it is hard to give specific advice. The best suggestion is that if it will be climate controlled, it should be built similar to any other climate controlled structure in your area. That means keeping damp, warm air away from cold surfaces, and building such that the walls can dry if moisture enters them. If you aren't ...
I'm not sure if there's a moisture barrier specifically that goes in between the paint and the wall of the bathroom, but there are paints that are made to withstand high humidity. Also, semi-gloss seems to be the finish of choice because it is better at resisting stains and moisture which are common problems for bathrooms.
What the contractor is "full of" is excellent advice. If you really want to spend money like you have a firehose connected to your wallet, dig out around the outside of the house to the footings and put drains there which slope out to daylight (or a sump if you want to be beholden to a sump, and its pump forever) - and coat the walls while you have it open, ...
Looking at the comments to the question, I believe even running the dehumidifier at a higher setting will have it running lots. The amount of moisture traveling to your basement from the open upstairs windows will be substantial, and you will be effectively "dehumidifying the outdoors". I would suggest looking into methods of limiting airflow between your ...
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