Vapor barrier on deck

[stephanwik]

Originally Posted by SustainableSerenityAcres

Mainly looking for suggestions on if we should use something like plastic sheeting or Tyvek and if so should it go up under the T&G flooring or down on the bottom of the platform on top of the OSB?

The standard way in Sweden is, from the inside -> out

1) T&G flooring

2) Plastic vapour barrier (the stuff I use is guaranteed for 50 years). 600mm overlap between rolls. This keeps the moisture inside the yurt from migrating down into the insulation. This is rolled on top of the floor joists.

3) Insulation (between the 600mm centre - centre joists). I use Earthwool.

4) Moisture permeable membrane (Tyvek will do just fine). This allows any moisture that might be taken up by the insulation to dry out.

5) OSB board (or some other board that is not sealed)