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High humidity levels, installing an HRV will fix that.
The best way to stain cabinets is to apply the stain over shellac then shellac over the stain last step Zip Guard over that to protect surface from moisture damage
Wood cabinets are generally not suitable for rooms with high humidity. High humidity can cause the wood to warp, swell, or rot over time. It is recommended to choose cabinets made from materials like laminates or thermofoil, which are more resistant to moisture. If you prefer the look of wood cabinets, you can consider using sealed or treated wood that is more moisture-resistant.
If you don't apply anything else to the cabinets, apply polyurethane to them which will create a water resistant barrier. You could also consider dressing them up with a latex paint or stain.
One of the biggest advantages of bamboo floor is that it is very moisture resistan.
About 40 percent of bone is made of moisture. Sixty percent of the bone is made of minerals such as calcium.
It would depend on the type of floor you are installing. There haven't been enough details about the project provided to answer this question thoroughly. If you are installing engineered hardwood just lay down a 3/4" piece of plywood and a moisture barrier. If you are installing a floating floor, use a moisture barrier and two 1/2" pieces of plywood. see related links
Some carpet paddings have a webbing or moisture barrier coating on one side. If you're installing over wood floors the moisture barrier goes up to prevent spills from soaking into the padding. If installing over cement below ground level the moisture barrier goes down, against the concrete - to prevent condensation and ground seepage from penetrating through the pad.
relative humidity
relative humidity
relative humidity