Anyone ever seen engineered attic trusses w/ hip roof?

[XS29L9B]

Let's say the garage is 34x42 w/ a hip roof.

Anyone seen "attic trusses" (I think I have this term right( w/ a hip roof? I have seen them w/ a typical gable end roof, but cannot seem to find them w/ a hip style roof.

I imagine where w/ a gable end roof, the attic "room" which would run 34' (the shorter span, as it's clear span beneath the attic, in the garage), the "room" would only be a portion of the width, depending on the pitch.

But let's say it's 14 ft wide, assuming 10' on each side is eaten up by the pitch, then if one could have a similar pitch w/ the hip roof on the longer ends, the overall room dimensions would equal 14x22.

14' x 22' would be a nice sized bonus room above the garage. What am I missing?

 

[socapots]

I don't think a hip style roof is the kind of roof that you can pre assemble parts with like an engineered truss is.
There was a pretty good post on here with a picture of how things go together for a hip roof.
Looks more like it has to be assembled on site.
As for having a room up there.. That's a good question.. It might be possible. Maybe someone can say something more productive.

 

[XS29L9B]

Near as I can tell, the "hip roof" portion is "stick built" w/ the engineered trusses in the center portion, which would be the portion that also would contain the proposed "room"

Thanks for the input

 

[socapots]

I see what you are saying.
That makes sense.
Can't seem to find that other topic with the picture I was referring to.
Bit in it there was a length of wood across the top of the roof that virtually everything else tied to.

 

[rsa]

Let's say the garage is 34x42 w/ a hip roof.

You could always ask a real truss engineer or PE.

There are different styles of hip roof trusses. For argument's sake, take a look at the step down style.

Assuming equal roof pitches, 42-34=8. The 8 feet in the middle are normal gable trusses and should be able to be configured as attic trusses.

I don't see why a few of the step down trusses can't also be configured as attic trusses, but at some point, even if they are able to be, you're going to start losing headroom.

What's the roof slope? The steeper, the better the chance for your large bonus room. Here's a back of the napkin sketch assuming 8:12 pitch and 7' of headroom.

You also don't have to have equal roof pitches. If you make the pitch steeper on the short side of the building, you'll get a longer ridge, and more gable attic trusses, and a large bonus room.

Before you go too far, you might wish to consider how you're going to insulate and/or vent the roof before you build it.

 

[BWS]

Two ways here.

On smaller,say under 2k sq ftg....often its:Run regular trusses for main body,dbling the units that are at the end of this center or main section.Then stick building the two end sections.Its bonafied and has certain benny's.

Larger sq ftg structures(and occasionally smaller places) its:Same as above,running reg trusses for main body.Then instead of stick building end sections,they have "special" trusses that while still oriented...fr to back(same direction as mains)....they are stepped down in series to create the hip "look".Its a little semantics because....the "hip" in a hip roof refers to the actual "hip" rafter......so,if there ain't no "hip"...how can you call it a hip roof?Haha.

In general....be especially careful when designing,so that the "ridge" is of an appropriate length.Start noticing this in your daily travels....the ridge,"length to pitch" ratio.Its a huge design element that....get it wrong,and it'll look like chit.Get it right,and it'll be hardly noticed.But,it is that little "look" that hips exude.

 

[Choptopjimmy]

You might be referring to a Gambrel Truss. CTJ

View attachment attic.pdf

 

[tomroblee]

I have a hip roof storage building that is built with trusses. The trusses at the center (where there is a ridge) are just regular trusses. As you go toward the ends, the trusses are flat on top and obviously need to be shorter as you aproach the end of the building.

I can't imagine that there would be any problem using attic trusses for the center part of the building. The main problem that I could imagine would be the placement of a stairway to access this second floor room. It would have to be located somewhere in the middle of the garage. Depending on how the garage was to be used, this could be a problem.