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PretendBuilder
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# Posted: 12 Jul 2025 07:08am
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I have my 12x12 cabin foundation completed and will next put in insulation and the OSB subfloor. I will get it framed and under roof as fast I can, but there will be some delay. I already have bought a large enough tarp to protect the OSB. Will I be safe this way, or should I spray some Thompson Water Seal or waterproof paint to be totally safe?
I see homebuilders leaving floors exposed for quite a while, so it makes me wonder. Again, I am going to get it under roof as fast as I can - just want to be proactive in case something comes up "lifewise" that delays the roof. Thanks for any suggestions.
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DRP
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# Posted: 12 Jul 2025 01:02pm
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Advantech is the standard for exposed subfloor, it can take quite a bit of weather. Still once you begin be ready to run for the roof.
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Nobadays
Member
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# Posted: 12 Jul 2025 05:01pm
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The log builders in our area buy the big blue tarps and cover the whole floor before they start stacking logs. As DRP pointed out Advantech or even exterior 3/4" plywood is way better than OSB for decking. Even "exterior grade" OSB won't stand up to weather for long.
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gcrank1
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# Posted: 12 Jul 2025 07:04pm - Edited by: gcrank1
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Ime Double Tarp!
I also recommend Not laying the tarp(s) flat on the deck! It will puddle and may seep.
Maybe make a ridge with sawhorses in the center and stretch the sides down to the rim joists. You can weight at the grommets with gallon water jugs or tie off to a beam, etc.
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Brettny
Member
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# Posted: 13 Jul 2025 07:17am - Edited by: Brettny
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For our 20x24 subfloor that I left for 2 weeks with no roof I used behr deck over paint that i found for super cheap on face book. We have all the walls built in sections on the right so that in 1 day we could stand up the walls and start putting the roof on. We had a prety tall and heavy roof though. Subfloor to tarp over the rafters in 3 days.
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FishHog
Member
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# Posted: 13 Jul 2025 07:26am
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If you don’t protect it. Not very long.
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PretendBuilder
Member
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# Posted: 13 Jul 2025 07:38am
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Thanks for the ideas. I had already planned to paint the sub floor and I do have a 16x20 heavy duty tarp. Yesterday it rained and I had the tarp over the joists and it worked great. I will be painting the OSB sheets in the garage before I take them out to install.
This is a small garden cabin in the backyard that will not be "lived in" - so I am not going to the expense of Advantech sheets. Last fall I built a 18x24 semi open carport for our DIY Ford Transit camper van. I think we will also pre-build the walls in there before we put the sub floor on. We could build the rafters, so we will have it all staged and go for it.
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Brettny
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# Posted: 14 Jul 2025 09:41am
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The most important part to protect is the edge of the sheets. I really slobbed the crack between sheets up on mine, filling them with paint.
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PretendBuilder
Member
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# Posted: 14 Jul 2025 09:46am
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We are adding insulation and then nailing the boards down today. I will either use some Thompson's Waterseal or Behr paint on all of it right away. I have a great tarp that will be on it until I start framing soon. I will put the tarp down every day until it is safely under roof. I will never just leave it wide open to the elements. Thanks.
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DRP
Member
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# Posted: 14 Jul 2025 09:05pm
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Wide open to rapid drying is the best thing any time it isn't raining. The downside of tarps is a little leakage under the tarp and a sunny day is pretty much a compost bag. If you are there all the time only cover it when its going to rain.
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PretendBuilder
Member
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# Posted: 14 Jul 2025 09:06pm
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That is the plan. I finished getting the insulation and subfloor on today. Framing begins soon and I will move along to get it under roof.
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