How to Put Thick Plywood Over a Sub Floor in a Mobile Home

Mobile home flooring is not always of the best quality. The sub floor is frequently constructed of particle board, with carpet or linoleum installed on top of this. If the floor in your mobile home is becoming spongy or creaks excessively, one solution is to add a new layer on top of the existing sub floor. This solution is easier than the alternative, laying a new sub floor, which, because of the metal joist construction of the mobile home, presents difficulties.

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Adding plywood on top of an existing mobile home subfloor can strengthen the floor.

Step 1

Remove all furniture and other items from the mobile home.

Step 2

Pry off any baseboards. Pull up existing carpeting and linoleum to expose the sub floor.

Step 3

Lay a sheet of plywood square with one corner of the mobile home. Leave a gap of about 1/8 inch between the plywood and the walls, to allow for expansion and contraction. Fasten the plywood to the sub floor with wood screws spaced every 9 inches. Counter-sink the screws slightly to ensure the screw heads don't stick up. A power screwdriver will make this job much easier.

Step 4

Measure and cut, if necessary, for the next piece. When installing the piece, leave a 1/8-inch gap between it and the previous piece. If you cut the wood, sand the edges to prevent splinters from sticking up.

Step 5

Continue cutting and placing boards until the floor is completely covered. Install new baseboards after you install your floor coverings.


Nichole Liandi

Based in Virginia, Nichole Liandi has been a freelance writer since 2005. Her articles have appeared on various print and online publications. Liandi has traveled extensively in Europe and East Asia and incorporates her experiences into her articles. She holds a Bachelor of Arts in history from West Virginia University.