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Old 07-06-2012, 01:19 PM   #1
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Insulating workshop building


Hi all,

I'm wondering about the best way to insulate my workshop building. It is a 16 x 20 building with 24" OC framing and a shingled gambrel roof. The siding is 19/32 PT siding. Of course there is no sheathing or wrap, just the siding nailed to the studs.

I had planned on treating the roof like an attic space, there is a ridge vent and I would add gable vents to either end and drywall across the bottom of the trusses to close in the attic space. Should I also add baffles between the rafters to prevent insulation touching the roof? There are no soffits or space to add any.

I'm also curious about whether to use any vapor barrier on the walls under the drywall.

Any advice would be appreciated!

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Old 07-06-2012, 03:23 PM   #2
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Insulating workshop building


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Originally Posted by kevrober View Post
Hi all,

I'm wondering about the best way to insulate my workshop building. It is a 16 x 20 building with 24" OC framing and a shingled gambrel roof. The siding is 19/32 PT siding. Of course there is no sheathing or wrap, just the siding nailed to the studs. Ouch. Best practice is to have sheathing, wrap, a rain screen, then siding.

I had planned on treating the roof like an attic space, there is a ridge vent and I would add gable vents to either end and drywall across the bottom of the trusses to close in the attic space. Should I also add baffles between the rafters to prevent insulation touching the roof? There are no soffits or space to add any. No soffits? Trusses don't over hang the sides? Hmmm. Ventilation is critical. There should be 1 sf/150 sf of attic floor. Baffles, absolutely.

I'm also curious about whether to use any vapor barrier on the walls under the drywall. No vb. Vapor retarder (like vr paint) and AIR seal.

Any advice would be appreciated!
See after bullets. Good luck.

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Old 07-06-2012, 04:25 PM   #3
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Insulating workshop building


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Originally Posted by kevrober View Post
There are no soffits or space to add any.
Name:  soffit.jpg
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Are you saying that the roof meets the wall like the figure on the left?
Or is it more like the figure on the right?
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Old 07-06-2012, 04:43 PM   #4
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Originally Posted by goosebarry View Post
Attachment 53612

Are you saying that the roof meets the wall like the figure on the left?
Or is it more like the figure on the right?
Yeah, it's like the left diagram. This was designed to be a storage building, but given its size I want to convert it to a workshop.
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Old 07-06-2012, 04:53 PM   #5
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Insulating workshop building


Thanks jklingel, what do you mean by "(like vr paint) and AIR seal."? Do you mean use some sort of paint or sealant between the studs to seal air gaps?
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Old 07-06-2012, 06:57 PM   #6
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Insulating workshop building


kev: vr paint woud go on your sheet rock (i assume you'll sheet rock) and then you'd use gaskets or Tremco acoustical sealant around the sheet rock edges to air seal (as well as all penetrations, lipped elect boxes, etc). i am very concerned about that "no overhang".
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Old 07-06-2012, 10:48 PM   #7
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Insulating workshop building


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No soffits? Trusses don't over hang the sides? Hmmm. Ventilation is critical. There should be 1 sf/150 sf of attic floor. Baffles, absolutely.
If he has no soffits there nothing to ventilate and no need for baffles.
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Old 07-07-2012, 12:57 AM   #8
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Insulating workshop building


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Originally Posted by goosebarry View Post
If he has no soffits there nothing to ventilate and no need for baffles.
Yes, but he has SOME ventilation, and if his roof ever has a tiny leak, it is best for the roof to have a little breathing room. Besides, he may find out that he has to do some remodeling to have overhangs. PS: These Aimer ads are quite interesting.
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Old 07-07-2012, 07:36 AM   #9
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Insulating workshop building


OK sounds good. I'm planning to go with either fiberglass or wool batts in the stud cavities, drywall, vr paint and acoustic sealant. I agree with you on using the baffles, I was under the impression that even if you don't have a soffit to draw air you still need an air gap to keep insulation away from the roof deck. I don't foresee any remodeling in the future to add soffits to this building though - with the ridge vent and adding gable vents on either end I think it will have plenty of air flow.

On the acoustic seal, is it just used along the top and bottom edges of the drywall or also on the studs? I don't know if your PS was aimed at me but what is an Aimer ad?
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Old 07-07-2012, 07:56 AM   #10
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WHat do you mean, siding nailed to the studs. There is OSB/plywood sheeting at least, right?
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Old 07-07-2012, 08:00 AM   #11
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WHat do you mean, siding nailed to the studs. There is OSB/plywood sheeting at least, right?
No, there isn't sheathing or wrap like I said. The siding is attached directly to the studs. This is a storage building.
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Old 07-07-2012, 11:47 AM   #12
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Insulating workshop building


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Originally Posted by kevrober View Post

On the acoustic seal, is it just used along the top and bottom edges... yes.

I don't know if your PS was aimed at me but what is an Aimer ad? Lingerie pop up ads instead of Great Stuff, etc. Eye candy.
c after bullets. good luck. j

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