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Old 05-16-2011, 01:10 PM   #1
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Sub floor type

Do I have to use marine grade plywood or can I just use something else?
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Old 05-16-2011, 01:16 PM   #2
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Some people use marine grade, I lust used a good 7ply standard plywood about $27/sheet and treated the top, bottom and edges before installing. That is more then the factory did and mine lasted 50 years.
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Old 05-16-2011, 01:17 PM   #3
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Did you use tongue and groove?
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Old 05-16-2011, 01:35 PM   #4
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Did you use tongue and groove?
I did not but that would probably be better, I reinforced the seams underneath. I would reinforce the tongue and grove also if not on a cross member and glue the seams.
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Old 05-16-2011, 02:21 PM   #5
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How did you reattach the plywood to the frame?
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Old 05-16-2011, 02:42 PM   #6
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We just completed a 1965 Tradewind, we used marine grade ply for two reasions; first it has a very smooth surface and if you plan on laying down any type to tile of lunoleum any uneveness will show. The second is marine ply has no pops or voids in the laminations which you can not see untill you step on a spot and it caves in. I am not saying that you can not use a good grade of plywood the choice is yours.
I used 1/4-20 carrage bolts to fasten the floor to the frame, not wure what they used in 75. I then glued and screwed a 1/4 inch plywood stip at each joint of the plywood. I think with this reply our attachment to a photo bucket shows the entire rebuild of our 1965 Tradewind and some the floor replacement.

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Old 05-16-2011, 02:55 PM   #7
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Vintage Trailer supply sells self drilling and tapping screws that work well for attaching the plywood subfloor to the frame. They work blind ( where you can't reach below to use a screw and nut). On my trailer I found I had to bear down hard to pull them flush with the subfloor and in doing so some were stripping out their threads. To remedy this I pre-drilled a hole and using a countersink made a divit in the plywood for the head of the bolt. Thusly, when I installed the bolt I didn't have to bear down as hard and they tapped themselves and pulled the head nicely flush with the plywood. There are probably other types of screws that will work as well but if you have to order any stuff from VTS these screws are a good choice.

Good luck with your job.
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Old 05-16-2011, 07:18 PM   #8
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What thickness is the plywood ? 5/8 or 3/4
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Old 05-16-2011, 07:47 PM   #9
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I used 5/8, but wish I would have used 3/4". 5/8 seems flimsy.
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Old 05-16-2011, 08:07 PM   #10
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I used 3/4" MGP. It was around $60 per sheet. I coated it with West System epoxy and Deftahne polyurethane floor finish. There are higher grades of MGP that use meranti veneers. They are generally above $100 per sheet. If you use a high quality exterior grade plywood and completely coat it with epoxy, you'll have a floor that will last and
last. I attached the new flooring with 1/4"-20 stainless steel elevator bolts from Fastenal. I used 1/4"-20 stainless steel hex head bolts through the C channel. I used the self drilling/tapping floor repair screws similar to what VTS sells with mediocre results to patch a few areas. They strip too easily.
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Old 05-17-2011, 01:08 AM   #11
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Just picked up my MGP today. I went with the Aquatec Maranti 5/8. I toyed with the idea of 3/4 but the added weight was a concern. Also like Top I am useing West Systems Epoxy for the edges.
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Old 05-17-2011, 07:15 AM   #12
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Quote:
Originally Posted by joneslacey View Post
Do I have to use marine grade plywood or can I just use something else?
I went with 3/4" AC plywood at $44.00 a sheet, a few small voids by the same water proof glue used in marine plywood, marine plywood to me is a waste of money, your not building a boat..........

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Old 05-17-2011, 07:26 AM   #13
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How did you reattach the plywood to the frame?
Try these, use a Forstner bit to countersink the head fully.

Floor Repair Bolts

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Old 05-17-2011, 08:00 AM   #14
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I used mdo 3/4" which is a exterior 7 or more ply that is coated on both sides. We use it for form boards for concrete walls and it last. I used it on the bed and sides of a flat bed trailer i have and that was ten years ago (no delamination and it sits out side in all weather conditions).
Used it on the floor replacement in the back end of our airstream no worries.
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