Best way to weatherproof OSB

weather-resistant

I am building a shed and I am trying to do it as cheaply as possible. I am going to use 1/2" OSB for the siding and I am wondering what the best paint/sealer is to weatherproof it. We live in central Ohio, so it will take quite a beating from rain and snow. Thanks!

Best Answer

There's no such thing. OSB will swell, warp, and degrade unless it's kept safe from sunlight and perfectly dry. No paint will do this. If you want to use OSB to sheathe the walls of your shed, you need to build those walls like the walls of a house: with a weather-resistant barrier like Tyvek over the OSB, and then cover that with siding of some sort. Vinyl siding is cheap and DIY-friendly.

If you want to build a shed out of a single material without needing to do any of this, I recommend concrete blocks.