Onoff Posted March 9, 2021 Share Posted March 9, 2021 Does "wood preserver" break down the resins/glue that bonds OSB together? I've used No Nonsense wood treatment on OSB3 and it seems to have thickened and "grown" on the small wendy house roof that I've not yet felted but has a tarp over it. Link to comment Share on other sites More sharing options...
SimonD Posted March 9, 2021 Share Posted March 9, 2021 It's probably just excess moisture under the tarp that's making it swell. In my experience tarps are terrible for protecting timber, they're often not entirely waterproof either, even when sold as such. Better off using sacrificial breather membrane. Link to comment Share on other sites More sharing options...
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