Scissor truss gable end wall.

[MitchNS]

Building a 30 x 32 garage with 10ft. Walls and scissor trusses.
I have been reading that I have to build a balloon wall for the gable end becuase of the hinge effect.
Hope it's not a stupid question but how do I build the end wall with a 8/12 pitch. Do I build a 8ft wall then build a 10 ft ballooned gable end from there?
Can't buy 18 ft studds here.
Probably not the last stupid question you guys will hear from me lol.


Thanks

 

[mike93lx]

I'd get a Gable end scissor truss (vertical framing) and balloon frame to the bottom of that.

There's a Better Way | SBC Magazine

www.sbcmag.info

Then sheath over the joint

 

[jack stand]

A real "lumber yard" will have or can get you 20 footers for the end wall framing.
Then engineered lumber is becoming more commonly used in these conditions and are much more rigid.
You'll probably only need a handful of long studs for the peak area of each endwall. Switch back to 16' lumber when they'll reach.
Remember your building the wall under the truss so you're lengths will be under 18' depending on the trusses ceiling pitch.

 

[mike93lx]

Remember your building the wall under the truss so you're lengths will be under 18' depending on the trusses ceiling pitch.

I believe he was talking about no end wall truss and framing all the way to the roof

 

[Youngandfree]

What's wrong with using a standard gable end truss and regular wall?

 

[mike93lx]

What's wrong with using a standard gable end truss and regular wall?

I'd recommend reading the link I posted.

It creates a hinge in the wall and has very little strength due to the different bottom chord profile in the trusses

 

[Rusted Nut]

You can usually mitigate the hinge effect by framing normal height wall and gable truss, then installing plywood sheathing vertically with the center of the sheet @ the top plate line. Also possible to use one or more full length 3x4’s to mitigate hinge effect. An HSS steel column can also be used. Truss company may be able to give you engineering for this.

 

[MitchNS]

I'd get a Gable end scissor truss (vertical framing) and balloon frame to the bottom of that.

There's a Better Way | SBC Magazine

www.sbcmag.info

Then sheath over the joint

By balloon framing up to the gable truss do you just mean a regular 10ft wall? Maybe I do t understand what balloon framing is

 

[mike93lx]

By balloon framing up to the gable truss do you just mean a regular 10ft wall? Maybe I do t understand what balloon framing is

Framing that goes past the top plate of the side walls. There's a picture in the link I shared

 

[BobnCO]

What's wrong with using a standard gable end truss and regular wall?

If you grab one of those and really shake it you can feel the hinge effect they talk about! It will always be less stable (with scissor trusses); that’s how they used to frame houses as scissor trussed became popular and the drywall inevitably cracked. In a shop (not a living room) you could always “kick it” with knee braces back into your scissor trusses (insert engineers yelling the scissor trusses are not rated for that here). That is why they came up with the balloon to the scissor truss design.

Nothing structurally wrong with the balloon wall up to the roofline EXCEPT (huge) it is nearly impossible to get the top plate of your balloon wall to line up with the top cord of your scissor truss’ unless you build your sidewalls and set your scissors THEN frame your full balloon sidewall. (I’ve tried both).

 

[andyvh1959]

I have 5x12 pitch scissor trusses on my 24x28 shop. On the south end I stick framed a 8x12 pitch hip (for solar panels). I framed from the truss to the top platewith 2x6, then put in 5x12 pitch short rafters to blend into the 5x12 pitch of the gable about 18" up from the top plate,and to get the right 12" overhang fir the soffit/fascia. Was easy then to sheet and shingle. On the front end I stick framed a 5x12 hip into a short gable where it met the truss. But I also set a doubled 2x6 header onto the truss to attach the 2x6 hip rafters, which i also sheeted internally with 3/4" plywood. Building inspectors was good with all of it.

 

[Hank11]

For a standard truss and flat ceiling you can brace the gable end platform framing plenty well. With an attic truss you can do the same. In both instances you have hidden room to do good bracing. With scissor truss ceilings, there isn't room to build in the bracing where it won't show and still do its job. You also have the ceiling and/or the upstairs floor adding bracing. Covering the "hinge" with sheathing fixes this mostly but it can be better. Ballon framing is one, the other is to interrupt the platform framing top plate with some studs that run full length or near. That would look like someone giving you the middle finger – one sticking up with shorter studs on each side that tie in the top plate. Thicker wall studs won't hurt either.