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Rules for truss layout
6

Rules for truss layout

Rules for truss layout

(OP)
As a structural engineer designing wood buildings, I sometimes cannot determine the correct or "best" way to lay out trusses of a complicated roof.
Is there anything printed, or available on the Internet as a guide?

RE: Rules for truss layout

(OP)
UcfSE,
Nothing about layout, but a gold mine otherwise - thanks!

RE: Rules for truss layout

2
I'd look at it from a manufacturer's perspective. Visit a truss plant and take the truss boss to lunch. It will be the best $20 you ever spent.

Girder trusses for hips should have a uniform setback. That way the jacks can all be the same....assuming the same pitch applies.

Next look at the span of the trusses. If they must only have 2 bearings then that's the way it is. But if at all possible then use multiple bearing walls.

Bear in mind that most truss manufacturers can only make a 12-14' tall truss. Then it becomes a base with a cap.

Rememer the more information that you supply the better the trusses are. Don't assume anything.

This is just my 2 cents worth.

RE: Rules for truss layout

Definitely hook up with a truss Manf. While chatting about your project over lunch can be enjoyable, save your cash and your time and just bring in your info to one of the truss designers to let them look at it. hear what they have to say. A good desiner can tell you in 15 mins how to save you time and headache...money too.
 These guys are the ones who work hand in hand with the end user. They should know what works in that market and what doesnt.
 

RE: Rules for truss layout

I agree with the suggestion about sitting with the Truss designer. I am one and I know if I look at a plan for about 15 mins I can tell you how to eliminate a lot of heavy girders and multiple girder tie-ins. Remember in Cantilevered trusses you can have 2' setback thus eliminating gider loading all together. Layout is more a skill thing than a rule bound thing. It is artistry if you may of saving money and not compromising on structural integrity. I have had many discussions with Struct Engs about them using long girders and corners. Since I am also a PE I can look at it from both perspectives now. If you have a question call a truss layout designer. Good luck!!!

RE: Rules for truss layout


If anyone from central Florida wants to hook up with a truss designer, try Casmin, Inc. in Leesburg. They have been around over 20 years and the designer they have dedicated to my company is one of the best I have ever worked with. I can count on him to find problems or questionable areas.

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