gable end wood buildings
gable end wood buildings
(OP)
We are designing a wood building 80 x 100 16 ft side wall roof slope 3/12 thus peak height about 22 ft. We plan using 16 ft studs 2x8. At the gable end would you use laminated studs from foundation to roof? Or build the end to same height as the sidewall and then frame from there to the roof with regular studs and brace the "hinge" at the 16 ft mark to the roof structure in the attic. Many builders seem to be doing that





RE: gable end wood buildings
Mike McCann
MMC Engineering
RE: gable end wood buildings
RE: gable end wood buildings
Mike McCann
MMC Engineering
RE: gable end wood buildings
RE: gable end wood buildings
RE: gable end wood buildings
j
RE: gable end wood buildings
Mike McCann
MMC Engineering
RE: gable end wood buildings
Two responses:
"By now - you should know better"
"Well - you have been doing it wrong all that time"
Usually does the trick and when push comes to shove: "If you do it that way - you now own it - not me"
RE: gable end wood buildings
RE: gable end wood buildings
Garth Dreger PE
AZ Phoenix area
RE: gable end wood buildings
After you have attended college for five years and obtained your BSCE, taken and passed your one-day EIT, done your four-year internship so that you could sit for your one-day Civil test, then done your two year internship so that you could sit to take your two-day structural exam and pass it the first time, give me a call.
Until then, shut up and get a life.
Mike McCann
MMC Engineering
RE: gable end wood buildings
J
RE: gable end wood buildings
Cheers.
Mike McCann
MMC Engineering
RE: gable end wood buildings
RE: gable end wood buildings
If it is vaulted ceiling, baloon framing is a must.
Never, but never question engineer's judgment
RE: gable end wood buildings
As to the use of balloon framing, I agree. However, I have never been able to figure out how many balloons to use.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: gable end wood buildings
Garth Dreger PE
AZ Phoenix area
RE: gable end wood buildings
These are very low values that have to be halved for Seismic D or higher. Would help in wind though at the connection being discussed.
To be honest, it would probably still be my decision to use the diagonal struts. I will have to look at this with the next project I get with a similar connection and see what the results are.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: gable end wood buildings
My understanding is this change came about because of gable end framing on structures with cathedral ceilings where the builders were putting the the top plate level all around the structure and then continuing the framing up to the roof which formed the hinge at the top plate.
As previously well stated you either need to balloon frame the end walls with full height studs or brace at a level top plate with a ceiling or diagonal braces perpendicular to the wall up to the other rafters or truss top chord and diaphragm. 2009 IBC just eliminates the builders argument that they have used level top plates and no bracing for many years without a problem.
RE: gable end wood buildings
RE: gable end wood buildings
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: gable end wood buildings
I have done this twice and both times the builder rebuilt it as a balloon wall. One should also be careful with drop legs of stub scissor trusses, as many times they are not designed for the lateral load from the wall.
Garth Dreger PE
AZ Phoenix area
RE: gable end wood buildings
All I got there was a single page. I guess I need an URL for a site where the document can be ordered. We are Structural in Canada with Codes of our own obviously but I sense the 2009 IBC may be useful.
J
RE: gable end wood buildings
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: gable end wood buildings
The Canadian Wood Council (cwc.ca) publishes a tall wall guide for single storey commercial structures. 2007 version is the current one I think. It's good for tall walls up to about 40 ft. high. Lots of good info, however, I don't think it will answer your question about the gable ends. From my experience, I would keep all the walls at the same height, have gable end trusses and brace back up to the roof diaphragm.