jar546
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In the 2018 IRC, Section R802.10.2 speaks to the bracing of roof trusses. According to this section, when using bracing for roof trusses spanning 60 feet or greater, at what intervals should the bracing be applied?
In the 2018 IRC, Section R802.10.2 speaks to the bracing of roof trusses. According to this section, when using bracing for roof trusses spanning 60 feet or greater, at what intervals should the bracing be applied?
Beyond the scope of the IRC, must follow an engineering design.The provisions of this section shall control the design of truss roof framing where snow controls for buildings that are not greater than 60 feet...
Didn't believe it changes the intent of my response. I did after all post the whole code section and quote from it.ClassicT ... you missed a couple of key words in your clip …
“buildings that are not greater than 60 feet (18 288 mm) in length perpendicular to the joist, rafter or truss span,”
This article agrees with that interpretation (although it says the limits only apply when snow load controls the truss design; when other loads control the truss design, it suggests the IRC still applies.)Beyond the scope of the IRC, must follow an engineering design.
Yes, but the truss engineer cannot simply rely upon the SBCA Building Component Safety Information (BCSI) Guide to Good Practice for Handling, Installing & Bracing of Metal Plate Connected Wood Trusses where exceeding the 60' limit.According to Section R802.10.1 of the 2018 IRC, "Trusses shall be designed in accordance with approved engineering practice. The design of permanent bracing shall be included in the truss design drawings. Permanent individual truss member restraint/bracing shall be designed by a registered design professional.
Yep, but i missed that, i was responding to the clip.Didn't believe it changes the intent of my response. I did after all post the whole code section and quote from it.
I am not sure where he was going... He's had a couple posts bending my mind.Yep, but i missed that, i was responding to the clip.
Interesting thought: was the perfessor intending 60 ft of span (which he said) or 60 ft of building length?
For wood trusses with a clear span of 60 feet (18 288 mm) or greater, the special inspector shall verify during construction that the temporary installation restraint/bracing is installed in accordance with the approved truss submittal package.
If the framer follows them it's not bad....I have had truss packets that are 1' thick with several girder trusses of different types and at least 10 different "typical" trusses....Rarely do they pass on the first try...I inspect trusses at the framing inspection. It's not difficult, nor remarkably time-consuming.
Yep...that is the section I was thinking of in post #10.....You and Commish nailed it in the world of "half a**" engineered building cautions...
60 FT TRUSS SPAN INSTALLATION DANGERS
Question:
How do I, as a truss manufacturer, adequately advise my customer against the dangers of 60 ft. and over truss span installations?
Answer:
IBC 2012 and 2015 include the following requirement:
2303.4.1.3(link is external) Trusses spanning 60 feet or greater. The owner shall contract with any qualified registered design professional for the design of the temporary installation restraint/bracing and the permanent individual truss member restraint/bracing for all trusses with clear spans 60 feet (18 288 mm) or greater.
The recommendations in SBCA’s BCSI-B11 Summary Sheet are based on actual field experience but are only a guide for the qualified building designer, builder or erection contractor. It is not the responsibility of you, the truss manufacturer, to determine the exact handling, installing and bracing of the trusses you manufacture. Offer the summary sheet as a recommendation.
The summary sheet notes that for trusses over 60 ft., a professional engineer should be involved. This is because of the increased risk involved with trusses with large spans. When you achieve large spans like 60 ft. or more, temporary bracing becomes an extremely important issue! Hoisting 60 ft. and larger span trusses is also a challenge, and the summary sheet provides recommendations for this task as well (namely, that strongback/spreader should be used).
You should take extra caution with long span trusses. Know who is going to erect them, and go over the summary sheet with that contractor.