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architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

(OP)
WHere to put girder trusses? SHOuld be simple right? Cheaper than conventional framing.? Rof is very steep ...around 15" rise per foot...interior slope maybe half of that.
Thanks

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

not sure I follow. wouldnt the trusses be the support on each wall? why a girder truss?

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Put one girder truss at each end of the ridge.

BA

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

I would think that you would have scissor trusses between the intersecting points of the hip rafters with a girder truss at the intersection and that you would have triangular trusses to 'fake a cathedral ceiling'. On the 34' dimension, the first girder truss would be at 11' approx and the second would be at 23' with scissor trusses framing between the 11' and 23'. You may have secondary girder trusses going from the corners to the mid span of the girder truss and have regular small trusses framing in the corners. I'll try to do up a sketch.

Dik

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Hipped roof systems normally have the girder trusses downhill of the end of the ridge. Does the ceiling slope up from the ends as well as from the long sides?

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Here, for a double hip truss system, the Hipmaster, or girder truss is normally situated 8 feet from the outside wall that the hips span to.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

I agree with msquared48, a 8' setback is commonly done. It is more cost effective. In your situation a 9' setback may also work out. As there from be no need for a 10' setback common scissor truss.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

The 8' setback is often used (almost standard) with a hip roof, but, with a flat ceiling. The proposed scissor truss does not lend itself to that configuration.

Dik

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

I understand.

Might want to consider glulam hips framing to the girder truss BA described with 2x rafters stick framed to it.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

(OP)
Wow...I didnt expect all the responses. Thanks everyone! Here are two drawing IM working on. I think the scissor trusses wil save money over conventionally framing the sapace. I also want a hight flat clg below the bottom chord of the scissor truss.It could probably be incorporated into the scissor truss..I think, of just framed on afterwards.I set the girder trusses back 8 feet from the outside face of the stud walls. Hope I can load these two sketches.

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Second sketch didn't load properly...

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Looks good. That's the right place for the girder truss. Flat bottom section and flat top section.

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

(OP)
Hokie, They are scissor trusses though,, but maybe with a flat clg or section on the bottom chord. But all the bottom chords are sloping, but may inforporate a flat section ......

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

With the truss spans you are talking about there is no problem doing this with a 6' to 11' setback. With or without the flat ceiling. The most economical with the flat ceiling IMHO would be a hip girder setback to the flat ceiling.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

(OP)
woodman,
When you say hip girder set back to the line of the flat ceiling....and maybe that point is where the girder scissor truss is located that carries the mono-scissor trusses at the short end? That might work but will have to look at the clg height I want, but that will probably work.
Thanks

RE: architect wants a scissor hip roof truss system. Room size is 22x 34...where to put girder?

Is there any problem with transportation of these 14' x 22' trusses?

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