Subfloor replace - Fiberglass RV


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Old 07-28-2021, 02:20 AM   #1
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Name: Tom
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Subfloor replace

Has anyone used a product other than standard plywood for their subfloor?

Anything similar to star board:
https://www.mcmaster.com/9785T828-9785T362/

Factory coated plywood:
https://www.fiber-tech.net/frp-panels

Or some other rot resistant option?
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Old 07-28-2021, 02:40 AM   #2
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https://youtu.be/3GHtBaUsYcE
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Old 07-28-2021, 06:14 AM   #3
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Star board is heavy and VERY VERY expensive.

IMHO if you do good maintenance and prevent leaks then a much cheaper alternative is fine and marine grade plywood is a step up - maybe not worth the added cost but it would make a very good subfloor.
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Old 07-28-2021, 06:19 AM   #4
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Quote:
Originally Posted by Tomo2 View Post
^^^^^^^^^^^^^^^^^^^^
Coosa Nautical 15 Series Composite Board, ABout $220 a 4x8 sheet. But its not available in many places and shipping cost is not included.
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Old 07-28-2021, 06:52 AM   #5
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I used " Avantech which is very water resistant and made the whole trailer more solid
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Old 07-28-2021, 07:49 AM   #6
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I replaced mine with 1/2 OSB, which I Flood coated before installing with waterlox. I will be sealing the edges and seams with fiberglass resin, and covering with water proof laminate flooring. The original floor lasted 25 years or so, and I figure this will outlive me.
WATER is the enemy, seal all of your openings.
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Old 07-28-2021, 08:16 AM   #7
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Originally Posted by Frank Spor View Post
I replaced mine with 1/2 OSB, which I Flood coated before installing with waterlox. I will be sealing the edges and seams with fiberglass resin, and covering with water proof laminate flooring. The original floor lasted 25 years or so, and I figure this will outlive me.
WATER is the enemy, seal all of your openings.

Interesting, what made you choose OSB over marine plywood?
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Old 07-29-2021, 06:53 AM   #8
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Marine plywood

Here in the Upstate New York, Marine plywood isn't something that jumps out at the home centers, and Treated plywood is toxic and generally anything but flat. OSB was just starting it's pandemic climb, and I could get 3 sheets out of the store at somewhere around $100.00. OSB holds screws better than CDX plywood, (so much of the interior is screwed to the subfloor) so that's how the decision was made. I took "ALL" of the shredded remains of the floor out except for under the bathroom. The special screws are available in various legnths, The drill point does not penetrate the frame however, and need pilot holes. I will use pocket hole screws to reinstall the furniture. I also felt the dimension of the subfloor was critical, because of the structural necessity of the furniture. which is why I did not go to the 3/4 advantech. The purpose of the resin is to adhere the OSB to the fiberglass, especially at the door which flexes quite a bit. Long answer to a short question.
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