Laying a sub-floor in an RV consists of many individual steps. After removing the tie-downs, insulating the wheel wells, creating plywood templates, cutting and gluing the strips of Poly-Iso to the floor, I’m now completing the insulation by filling the voids with a spray foam application.

Although it is a closed-cell, waterproof foam, after cutting off the excess, what remains is susceptible to moisture, but still adds insulation and some structural cohesion to the floor.

As always, I have detailed every step on the Project’s Page, and added lots of pictures and a video.

Mod: Insulated Floor – Spray Foam Application

Previous articles:

Mod: Insulated Floor

• Tie-Downs & Wheel-Wells
• Plywood Templates
• Floor Insulation
• Gluing Insulation