Draper's frame consists of cold-rolled steel and closed-cell spray insulation for the floor, walls, and roof. Land Ark RV added an extra layer of rigid insulation outside the framing for the walls and ceiling.  Photo 5 of 16 in This Adventure-Ready Tiny House Has a Mud Room and a Fold-Down Deck

This Adventure-Ready Tiny House Has a Mud Room and a Fold-Down Deck

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Draper's frame consists of cold-rolled steel and closed-cell spray insulation for the floor, walls, and roof. Land Ark RV added an extra layer of rigid insulation outside the framing for the walls and ceiling.