Subfloor Construction

This past weekend I started on my subfloor. I had both my Dad’s and my sister’s help for the entire process. It took a total of three full days of construction. Prep work the week before included fifteen hours of painting, about an hour of ripping down the joists and several hours of laying out the joist positions on five sheets of painted plywood. The entire subfloor took about 80 man-hours.

My Dad took care of ripping down 1-1/2″ x 2″ joists from 2x10s and 2x12s. This provided maximum yield from off-the-shelf lumber.

Ripping joists

Ripping joists

I spent each evening for five days painting the subfloor components for extra protection. This totaled 10 sheets of plywood and over 300 feet of 1-1/2″ x 2″ joists. I used both primer and recycled paint.

Painting the subfloor plywood

Painting the subfloor plywood

Next, I laid out the joist locations on the 5/8″ subfloor plywood.

Laying out joists on subfloor plywood

Laying out joists on subfloor plywood

Saturday morning we all teamed up to assemble the subfloor sections with Loctite construction adhesive, ringshank nails and decking screws. 

Trimming plywood for subfloor section

Trimming plywood for subfloor section

Trimming subfloor joist members to size

Trimming subfloor joist members to size

Attaching joist members to plywood

Attaching joist members to plywood

We applied GAF underlayment directly to the trailer to prevent direct contact between metal of the trailer and the wood subfloor.

My Dad applying GAF underlayment on trailer

My Dad applying GAF underlayment on trailer

We placed each of the subfloor sections on the trailer to ensure a good fit. Once we were satisfied with all the sections, we attached each section to the trailer with self-tapping metal screws and the sections to each other with more ring shank nails.

Subfloor sections in place on trailer

Subfloor sections in place on trailer

All five subfloor section in place

All five subfloor section in place

All three of us made short work of cutting and inserting the 2 layers of 3/4″ insulation.

Filling subfloor with insulation

Filling subfloor with insulation

My sister, Sabrina, trimming insulation

My sister, Sabrina, trimming insulation

Filling the gaps between the insulation with spray foam was messy, but fun.

Filling the gaps with spray foam

Filling the gaps with spray foam

Trimming dried spray foam level with the tops of the joists

More fun with spray foam

Insulation and spray foam complete

Insulation and spray foam complete

Insulation and spray foam complete

Insulation and spray foam complete

Trimming dried spray foam

Trimming dried spray foam

Capping off the subfloor went smoothly.  We finished it off with more decking screws. We then used a router to clean up the edges.

Trimming the top sheet of subfloor plywood for the wheel wells

Trimming the top sheet of subfloor plywood for the wheel wells

Attaching the top of the subfloor sections

Attaching the top of the subfloor sections

Three subfloor sections capped off

Three subfloor sections capped off

Cleaning up edges of subfloor sections with a router

Cleaning up edges of subfloor sections with a router

The subflooring is complete

The subflooring is complete

I left this post as a fairly simple overview so not to bog down readers with overly detailed information. If you have specific questions about any of the construction aspects please leave a question or comment below.

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Categories: Tiny Home: Arborion | Tags: , , , | 1 Comment

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  1. Pingback: Utility Annex | Verdant Passages

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