Attic Trusses

[builtright3]

Hey Guy's,

I get this warning when I try to make and attic truss and Im not sure how to fix it.
I made a second floor with a ceiling hieght at 4 1/2" high so the framing will come out the way the we want it. He is doing these 4 foot eaves with a soffit returning back to the wall and so I needed more height. Everything looks good in my section but we also want an attic truss.

If anyone can help me figure this out I would much appreciate it.

  

[JonathanK]

Would this be a "3-story" house?

 

First floor would be your main floor; Second floor would be your little air gap you're showing; third floor would be the attic space.  You would draw the walls, ceiling, etc.. on it as if it is another floor in Chief?

 

We don't get heavy into showing framing and trusses, so not 100% it will work.  But that's how I'd do it.

 

 

[builtright3]

8 minutes ago, JonathanK said:

Would this be a "3-story" house?

 

First floor would be your main floor; Second floor would be your little air gap you're showing; third floor would be the attic space.  You would draw the walls, ceiling, etc.. on it as if it is another floor in Chief?

 

We don't get heavy into showing framing and trusses, so not 100% it will work.  But that's how I'd do it.

This would just be to make space for the HVAC system (FAU). Its not for a room.

[GeneDavis]

You didn't need to add that second floor to gain heel height.  Just raise the roof.

 

You might learn something from this video.  Check it out.  Sounds like you want a platform of sufficient size in the attic for the air handlers and supply and return trunks, so the attic might just need 5 trusses to give an 8' long deck.  You'll need to guess whether the truss engineer will do the trusses with a 2x10 or 2x12 bottom chord, but that'll all be figured at truss-quote time.  Use attic walls parallel to the trusses so you only get the attic trusses you need.  

 

 

 

[JKEdmo]

Joe,

 

Have you seen this?

 

https://www.chiefarchitect.com/videos/watch/354/framing-with-attic-trusses.html

 

Jim

[JonathanK]

14 hours ago, builtright3 said:

This would just be to make space for the HVAC system (FAU). Its not for a room.

I get that, but that's likely why it isn't working to build the attic truss.  It's looking for a room w/ attic space on both sides and a flat ceiling.

 

The pictures I posted above we're just a thing I whipped up quick with 3 stories.  I think that's what you're looking for.  You just make the "room" as big as you want the space for HVAC and call it good.

[builtright3]

Yes, I saw the video, but it is not what I’m trying to do.

I understand that I could have used a heal but then the framing would not have worked out the way I wanted it.

 

I used the second floor for these reasons:

1) We don’t want to disturb any of the existing ceiling joist, plaster, electrical or plumbing.

2) With the second floor it gives us another set of joist over the top with an air cap for the new roof framing and larger cavity for the insulation.

3) I also needed the height for those boxed in eaves.

I am now thinking I may want to stay with conventional farming.

 

[builtright3]

This is NOT new construction.

I don’t know if I made it clear that we are going over an existing structure. We are removing the old roof structure (sheeting and rafters) and leaving the existing ceiling joist. Instead of a 3:12 pitch we are doing a 5:12 pitch becasue he wants more attic space and insulation.

I only wanted to install trusses because I thought it would be easier structurally but now, I’m not sure. If the owner wants more attic space to move around in for whatever reason, then I can open it more with conventional framing, but this will mean doing a ridge beam with larger rafters for the long span.

 

This is one of those situations where the owner wants certain things that make everything unconventional and difficult. It increases the cost but if he is willing to pay I will figure it out for him.

[builtright3]

Thank you guy's for your help.
This problem has been solved.