Condensation concerns in barndominium
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April 23, 2025 at 3:16 p.m.
laurenwhite
Mark, a homeowner in Missouri, asked the following:
I have a barndominium. I have a condensation issue on an outer wall where the house begins. I only have this issue in one area. I was wondering if I could speak with someone or have someone come take a look at it to figure out what I can do.
April 23, 2025 at 3:17 p.m.
laurenwhite
Oliver Bell with The Barndominium Company said:
Without being able to physically view the item and reviewing the limited info you provided… it seems that his vapor barrier is either ineffective or does not exist.
It appears that he used the metal building bat insulation – we do not recommend that for residences (perfectly fine for garages, outbuildings, etc.). The plastic backing on this is not really a moisture barrier favorable in a residential environment and if it was breached by speakers as you suggest – that could present additional issues.
With this moisture issue and its evidence on the interior, he should most likely
- Remove the drywall
- Remove the insulation
- Check for mold – remediate whatever is necessary
- Apply closed cell spray foam (to the required R value – at least 3 inches ) in the proper ratio mix to create his vapor barrier and insulate the roof.
- He should likely redo his entire building insulation in spray foam, or he will probably see some repeat of this issue elsewhere in his home.
He should also talk with a local general contractor or remodeler to get more expert, onsite advice.
That as much as we can offer at this point. I hope this helps some.
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