Our next stage was to add the insulation and subfloor. Given our Northern climate we use four inches of rigid insulation in the floor: one inch in the frame of the trailer and three more inches in the floor joints below the subfloor.
After adding the additional supports to the trailer, we bolted the cross tie supports for the bottom boards.
Next, the bottom boards were screwed to the cross supports.
A bottom board was attached to the front addition which will support the bath area.
We added the 2x4 floor joist and three more inches of rigid insulation on top of the existing one inch in the frame for a total of four inches of rigid insulation. We then covered the insulation with a vapor barrier before adding the subfloor. Bottom to top: 1/2" plywood, 1" rigid foam, then the 2x4 floor structure which contains a layer of 1" foam and a layer of 2" for a total of 4" rigid foam floor insulation below the 3/4 ply. All gaps were filled with adhesive spray foam.
Finally, a ¾ inch subfloor was screwed to the floor joists.
Everything was completed and covered just before the snowstorm.
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