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Old 05-18-2010, 07:28 PM   #1
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Questions


PS. IT WILL NOT ALWAYS BE HEATED IN THE WINTER

I am going to build a small workshop and i plan to insulate using roxul or JM insulation w 6 mil vapor barrier.
In the floor i plan to use 1" foam and i wondering if i need to vent the floor joist cavity if i did so?

Also in the walls i will be using typar or tar paper over the studs behind the sheathing/siding and i wondering if i would have any moisture problems or if it is fine. I was told by one fellow i should not put vapor barrier.
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Old 05-22-2010, 01:15 PM   #2
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Re: Questions


Your on the right track with using JM insulation in the walls, and putting up 6mm poly. I wouldn't suggest using Roxul, for a small workshop there wouldn't be many benefits.

I'm a little on confused as to why your putting 1 inch foam in your floor. You could insulate the floor with batts, and get a higher R-value with a lower material cost.

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Old 05-22-2010, 07:47 PM   #3
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Re: Questions


Quote:
Originally Posted by Taylor8 View Post
Your on the right track with using JM insulation in the walls, and putting up 6mm poly. I wouldn't suggest using Roxul, for a small workshop there wouldn't be many benefits.

I'm a little on confused as to why your putting 1 inch foam in your floor. You could insulate the floor with batts, and get a higher R-value with a lower material cost.
I might but would i put vapor barrier?
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Old 05-22-2010, 07:59 PM   #4
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Re: Questions


Yes, you should use a vapor barrier.
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