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wet insulation
Having done hurricane rehab on the coast, bleach over time will not work. Especially with OSB being flaked material, the mold will continue to grow. And it continue to puff up ruining the steel siding. I feel the OSB behind the steel with or without a barrier is not necessary, and could harbor moisture. I would just side it with metal, insulate it without doubling up batts (if they are being compressed that actually reduces the value---needs air space), then apply plastic barrier to inside, then install paneling.
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wet insulation
Like I tell my customers pay me now to do it right or pay me double to redo it later. The mold will--or likely has--- eat into the studs after it destroys the OSB. My pole building guide says to use plastic sheeting or 30-lb felt paper between the siding and insulation---doesn't address your situation as normally siding over OSB is redundant.
The black mold when inhaled (and a doctor warned me about even skin contact) that you get that thrives on cellulose is known for causing brain damage, permanent memory loss and even death. Think of the liability you have already exposed yourself to--- assuming your kennel is a commercial operation--now that is in the public domain. Good luck getting insurance or a claim if this comes to light.
And the mold/moisture in the wood will continue to react on the fasteners rusting them and cause the siding to rust--Tyvek is not a cure-all and is not an advisable or suitable product---it' meant to be used with breathable siding like vynil that could see some venting and allows the siding to slip or slide without creating noise.
Before you do anything contact your building inspector if he is respected and get his opinion.
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wet insulation
Like I said earlier, the OSB is redundant. So why not just remove it rather than all the work and money to remove, paint and rehang only to semi seal-in the mold. If it can't completely and thoroughly dry it will be semi sealed in and continue to fester, and being OSB the flakes will swell regardless of how much paint is used. And this all may be moot if the OSB is so detiorated it may just crumble as it's removed.
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