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Old 10-15-2017, 10:10 AM   #1
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Insulating a new wooden shed


I just bought a 12x20 shed with a barn-style roof, and I want to insulate it so I can store paint and such in there.
I'm thinking about doing regular backed-batting for the walls, R-19. For the roof, since everyone says we need an airspace between the insulation and the (metal) roof, I'm thinking about getting the foam boards and affixing them to the rafters, which will leave a 3.5" air space. With duct tape? Will that work?
It really is a storage shed, though I might do some minimal repair work, but won't be in there long periods. Do I need to add drywall or thinner "something" to finish out the walls or can I just leave the insulation exposed?
I have two loft storage places on either end, and each end has a vent. Okay to leave that as is or do I need to install a vent closure for winter?
Lastly, what about insulating the floors? Underneath? I live in the foothills of WNC so it does get cold here but rare that it's below freezing for extended periods.

Thanks so much in advance for your advice! Excited to get going. And happy to be here with you all.
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Old 10-15-2017, 11:39 AM   #2
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Re: Insulating a new wooden shed


Insulation alone won't keep the paint from freezing during extended cold spells, you'll need some type of heat source. I store latex paint in the tool room section of my shop but I also run heat in there whenever the temps are expected to get mid 20's or colder overnight.
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Old 10-15-2017, 11:44 AM   #3
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Re: Insulating a new wooden shed


Thanks, Mark! I forgot to put that I do intend to put some sort of heater in there. Do you think my insulation plans are sound or have alternative ideas?
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Old 10-15-2017, 11:49 AM   #4
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Re: Insulating a new wooden shed


My room has a concrete floor but the walls only have R-11 and the ceiling only a little more. I covered the walls to make it cleaner and give me lots of space to hang stuff.
Insulation is a little out of my league but it's not like you need to heat the space to the extent you would a room in your house.
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Last edited by mark sr; 10-15-2017 at 11:57 AM.
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Old 10-15-2017, 03:23 PM   #5
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Re: Insulating a new wooden shed


It is typical that the Foam insulation would be covered in drywall and the joints taped as a fireguard. Batt insulation does not require the same treatment.
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Old 10-15-2017, 10:10 PM   #6
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Re: Insulating a new wooden shed


Do you live where snow and ice on the roof are an issue?
If so, you may have to at least put in a ceiling to keep some non-insulated space with vents exposed to the inside of the roof, then insulation and ceiling to the heated inside space.

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