Moisture variations cause clays toexpand and contract more than other types of soils.

Hello BPers,We ran into a roofing situation, and we would love to hear your inputs to our situation.We have a rental property in Kent, WA and a couple week back, the tenant reported observing moisture on the wall and mold on the carpet. 

Low cost, resilient, no worries about moisture, expansion/contraction, easy to lay, and easy to replace damaged pieces. 

Use greenboard if you build a new bathroom and also a more moisture resistant paint, such as a good semi-gloss.Retrofitting older bathrooms with fans is not always easy, because you ideally need to vent to the outside. 

The digital moisture gauge they used detected lots of moisture on top of the planks, and none in our carpeted rooms.  

Selling my personal house...there was a crawl space moisture issue that has been 100% repaired.

Since it won't be in the bedroom dealing with moisture - would I need to vent it outside or would venting it to the attic space or right underneath the roof vent be sufficient?

Hello,My rental has a fireplace and when it rains, the tenants notice signs of moisture by the tiles (it darkens).

It seems possible, but unlikely, that some sort of leak could be penetrating through the wall penetrations, and someway working it's way into the kitchen.

I’ve not used these myself for metal roof projects yet, but can report good things from this brand.https://www.lowes.com/pd/Teks-9-x-1-1-2-in-Zinc-Pl...The ones with small washers tend to be used for metal applications and the ones with large washers for spreading the load across surface area (probably ideal for translucent material of a greenhouse).As others have mentioned, the key is to have a decent coating that resists oxidation and a good seal.If these are used for penetrating metal, It’s sometimes helpful to give the screw a light tap with a hammer to keep the screw from wandering, potentially scratching or denting the roof when the driver gets wobbly.