Tacking Up Plastic Under Floor Joists Bad Idea

This level of wet is rare but it is out there.

Tacking up plastic under floor joists bad idea. We want to insulate the floor which is two different levels. Around the perimeter of the crawlspace extend the plastic sheeting about 12 inches up the walls and secure it in place with double sided butyl tape. Remove the plastic from the ceiling of the crawlspace and install a new vapor barrier or encapsulation system on the ground floor. Where necessary you can cut additional small pieces of plastic to seal any gaps and ensure a full barrier.

The down low on fixing up crawl spaces. We had them remove the hot tub and we want to turn the room into a 4 seasons room. The plastic will trap the condensation up against the floor structure causing mold growth and dry rot. I would custom bend some aluminum flashing at 90 degrees that would drain directly onto the plastic from under the siding.

The plastic or aluminum sheets would have to be cut in a way that one side is wider than the other so when secured to the parallel joists it would form a gradual slope of excess material. The goal is to provide a solid barrier against the ground. If you have that much moisture that it pools heavily under the plastic enough to allow mould growth you have a serious problem and the plastic ain t gonna cut it. The solution is simple.

It needs to be remedied. This is what asvinteriors is talking about. Vapor barrier ran up foundation wall and stapled to sill plate. Installing roll insulation in ceiling of basement which is under floors of living space my basement is heated but a smaller amount than up in living space usually 66 68 upstairs and 58 60 at the same time in basement my question is about the kraft paper facing i think it should face the basement because of any moisture in basement.