Insulate Gable Wall for scissor truss

[CSattl09]

New poster here!
I’ve been enjoying all of the info on this form, it has been very informative.

My question is on preferred approach to insulate the portion of a gable wall that is below the ceiling line for a scissor truss application. How do I do this?

The gable wall on my garage is constructed from what looks to be 2x3’s, with the longer 3” portion flat against the wall. This only leaves 1.5” space for insulation. I’m already planning to add a “nailer” that runs parallel with the scissor truss so that I can extend drywall/etc to the gable.

Do I just add extra 2x3 or 2x4 to the gable as an additional wall, with the wide side pointing outward like a 2x4 stud wall? How best to attach this to the gable?

Thanks for any help

 

[flippin]

I just recently added a 3rd bay to my attached 2-car garage. The new bay is 5' taller than the existing garage. To maximise the height in the loft above the new bay I also utilized scissor trusses. I insulated the gable wall of the existing garage (where it met the new addition with spray foam. I need to added a lot of additional support where the first truss of the new garage met the gable of the old garage. Spray foam ensured that everything was nicely sealed.

 

[larry4406]

New poster here!
I’ve been enjoying all of the info on this form, it has been very informative.

My question is on preferred approach to insulate the portion of a gable wall that is below the ceiling line for a scissor truss application. How do I do this?

The gable wall on my garage is constructed from what looks to be 2x3’s, with the longer 3” portion flat against the wall. This only leaves 1.5” space for insulation. I’m already planning to add a “nailer” that runs parallel with the scissor truss so that I can extend drywall/etc to the gable.

Do I just add extra 2x3 or 2x4 to the gable as an additional wall, with the wide side pointing outward like a 2x4 stud wall? How best to attach this to the gable?

Thanks for any help

Yes you install an overbuild on the flat scissor truss to plane out with the wall below to accommodate your insulation.

 

[CSattl09]

Here is an image. I’ll try to get a build thread going at some point.

I’ll see what I can do to build out the gable end for attachment. I’m not quite sure how I’ll attach a vertical 2x4 to the existing 2x3.

 

[The Cobbler]

strap the 2x3 to the thickness you need to be flush with the framed walls. you could use 2" rigid foam too probably
add a nailer to that, inline with your trusses so you can attach your drywall or sheathing

 

[larry4406]

Here is an image. I’ll try to get a build thread going at some point.

I’ll see what I can do to build out the gable end for attachment. I’m not quite sure how I’ll attach a vertical 2x4 to the existing 2x3.

Nail the vertical 2x4 to the side of the flat 2x member.

 

[The Cobbler]

^^^ yes, this
that was easy! LOL

 

[Bert_]

Why do people frame like this? Since this is a scissor truss it puts an unsupported hinge right in the middle of the wall.

Even to an electrician it just looks wrong...

 

[CSattl09]

So this is what I came up with. Since there is a 2x4 sticking out the width of a 2x off of the sill plate, I had to use a 2x4 in front of the vertical 2x3’s. That was the only config I could think that would line up with the sill plate.

I’m using mending plates on the flush side, and L brackets on the other. Since this isn’t load bearing, it should hold nicely especially once tied in with the nailer 2x4 and Sheetrock.

 

[The Cobbler]

looks good

 

[CSattl09]

Why do people frame like this? Since this is a scissor truss it puts an unsupported hinge right in the middle of the wall.



Even to an electrician it just looks wrong...

Bert, I agree. It doesn’t appear ideal, but I suspect once it’s all tied in with the sheathing there is some rigidity. Plus, on the side with my opener there is a 2x4 that ties in with the sill plate. Any opportunity to improve this? I’m not sure how it will be draywalled around. I’m hiring that job. Garage was build 15 years ago. 38x24