The subfloor serves as the layer upon which your whole house is built. This step is crucial in creating a level, sturdy surface to the rest of the house to sit on. After configuring which Rvalue of insulation would work good in the tiny house, we waded through the different insulation options from spray foam to blue jean. This determined what size floor joists we would be using (2 x 4 or 2 x 6).
The subfloor sandwich of our tiny house trailer includes the following:
-Metal Roofing (flipped upside down and screwed down to the trailer)
-Sil Gasket where the metal meets the wood
-Vapor Barrier over roofing (tucked up over the 2 x 4 subfloor flooring)
-Subfloor framing with 2 x 4’s
-Foam Board Insulation in the subfloor bays
-Pink Insulation over foam board
-Plywood over the subfloor framing
If you have any questions about this subfloor sandwich, please feel free to comment below!