Reply by clin

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Posted on Insulating detached garage shop

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1128 posts in 2081 days

#1 posted 07-16-2019 05:13 PM

Moisture issues can be very specific to where you are located. I’d make sure to find out what best practices are in your area. Generally you want to do everything you can to seal the outside. But that is already done, well or not.

The general issue is water vapor passing through the insulation and condensing on cold walls or roof. This for example is why attics are often vented. Any moisture that gets up there has a place to go. There are ways to keep insulation off, but close to a roof and vent it. Usually through soffits (which you don’t have). This is why spray foam can work so well. It seals and ensures no water vapor can reach it.

That said, I’ve also heard that moisture getting in from the outside tends to be the real issue, and the better sealed it is on the inside, just makes it hard for the moisture to dry. This brings me full circle to finding out what is best and common in your area. Often it is a compromise for what is best most of the time. And you’ll need to factor in the details of how the existing structure has been built. What’s best for a stud wall is probably not what is best for a block wall.

Bottom line, get some local expert advice. You don’t want to create a rot or mold problem.

I also think there will be a way to insulate the roof without forming an attic and therefore make use of the overhead space for storage. I think you’re making too much out of the added insulation. Unless the roof is abnormally steep, I doubt the roof area is that much more than the ceiling area.

On that note: Storing lots of wood can be heavy, make sure the roof structure can support that. If not, reinforce as necessary.

-- Clin

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