One of the most talked about subject in tiny house building is the subfloor. Once a trailer has been chosen it quickly becomes time to decide just how the house will stay attached. And that is where the subfloor comes in.

Because we chose to use an EcoFoil radiant barrier we knew that would be one of our first steps. It wasn’t THE first step though. We ran essentially a string down the center of the trailer in between each cross beam. This serves as extra structural support as well as a way to hold in the insulation. Once we had the blanket of double bubble radiant barrier on the frame we added our floor joists. Each joist was constructed of 2″x4″ lumber and held in place two ways.

1) If the joist fell directly on a metal cross beam it was attached by a 4 1/2″ carriage bolt that is countersunk through the wood and then down through the metal, going through the EcoFoil and then tightened up by a washer and bolt.

2) If the joist did not fall directly on a metal cross beam it was attached via joist hanger which was attached by nail to the perimeter framing.

After our joists were in place and bolted down we then wrapped our remaining EcoFoil around the framing, stapled it into place, and prepared for the subfloor. Our subfloor is LP ProStruct Floor with SmartFinish – a durable overlay of beautiful, professional-grade substrate With no knots or voids. The subfloor is held into place by a bead of construction adhesive on all exposed joists and then 3 1/2″ framing nails around the top perimeter of the 4’x8′ sheets of sub.

And because I am not very adept at verbally describing things, here is our latest video on our tiny house construction.

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