Planning, part 2: The subfloor

After the trailer purchase and finding a spot to park while I build my tiny house, I’ll start on the subfloor. The insulation in my subfloor will be within the trailer ribs and frame itself, gaining about 4 inches of headroom without losing trailer ground clearance.

The plywood for the subfloor will rest directly on top of the trailer (with something along each rib to avoid direct metal-to-wood contact). I’ll need to make sure I bolt the subfloor to the trailer, and then bolt the wall framing down to the subfloor through the trailer. This will also be the first time I hire a contractor – I’ll need closed cell spray foam insulation¬†in the floor before it gets closed up.

Materials and Labor:

  • Flashing tape to seal the pre-installed flashing under the trailer
  • Insulation contractor (closed cell spray foam in subfloor, approximately 160 sq ft, 4 inches deep)
  • 2×4 lumber for side rails and edges of trailer
  • 3/8″ bolts, washers, nuts for bolting subfloor
  • Drill bit for pre-drilling bolt holes
  • Sill seal to lay between the subfloor and the metal trailer ribs
  • Do I still need to screw down the subfloor every 6 inches on the outside edges and every 12 on the interior of each sheet? (Presumably, yes.) What screws do I use for that since it’ll be going from wood into¬†the metal trailer?
  • Tongue-and-groove plywood for the subfloor
  • Liquid Nails for attaching the plywood to the trailer ribs and outside edges.

Now to research the questions above. If you have any input, I’d love to hear it!

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