This Q is open to anyone really, but I addressed it to Boss due to his imtimate knowledge of engineered bldg materials.
Bidding a 50′ x 50′ 2-level shop/garage for a good friend of mine. Downstairs is 6″ slab w/ 12′ ceiling for above ground lift. Up will be small-engine repair and classroom/office space.
Would like to have a single girder downstairs with minimal columns, thus giving me 2 runs of 25′ floor trusses.
Need to know:
Girder material/size (no steel please)
Truss height, spacing, and load rate yield for that given config.
Approx. truss cost
Approx. cost for 50′ roof trusses, 4/12, 16″ overhang
In other words, how would y’all build it? I know what I’d LIKE to do, but this is for a non-profit org. and I’m afraid I would figure it unnecessarily expensive.
Thanks
The best reward for a job well done is the opportunity to do another.
Replies
>> Would like to have a single girder downstairs with minimal columns, thus giving me 2 runs of 25' floor trusses.
Need to know:
Girder material/size (no steel please) <<
My ESWAG is that you will need steel to minimize columns. For that matter, this sounds like a real candidate for a metal building.
Columns @ 10' O.C. (for a total of 4) would be OK. Not crazy about metal bldgs myself. There's a severe slope where we're planning to build, so about 60% of the foundation will be below grade (12" block w/ filled cells).
I guess we could go metal from there, but this is all donated labor so I need to keep it simple.The best reward for a job well done is the opportunity to do another.
I don't have a clue to suggest what to recommend for a center beam without knowing what floor loading will be used. For classrooms you may be looking at a live load from 50 to 100 PSF depending on what code you're under. That would make a heck of a difference in the beam loading.
I don't do much truss pricing, so coming up with a reasonable number would be tough to do. You could probably get a number pretty quickly through a truss company or lumber yard since it's a simple building.
If ya just want a wild guess, I'd say $1.50 a square foot if the roof is a gable. More for a hip.
The floor may be $2 or more, again depending on the loading.
But even with that - Truss pricing varies a lot from one region to another. So I wouldn't really recommend using those numbers except for the roughest of budgets.
Thanks Boss,
I'm just looking for a very rough number to send to my buddy b/4 I get the truss co. involved.
Question though. You gave me sq. ft. numbers; wouldn't that vary depending on the O.C. spacing? The best reward for a job well done is the opportunity to do another.
Yes it would.I assumed 2' O.C. spacing and a shingle roof. Did I miss something ???
A point of view can be a dangerous luxury when substituted for insight and understanding [Marshall McLuhan]
Shingled roof yes, but I generally don't build anything 2' O.C. if I can help it. Just a Me thing. Budget may force me to be a bit more open-minded.
You at least gave me a place to start.
ThanxThe best reward for a job well done is the opportunity to do another.
Here 99% of residential trussed roofs are 24" OC. I'm thinking I'm only a hundred or 2 miles from you. OTOH, this isn't really residential... Call a truss company. The way the building market is now, I'm sure they are hungry for some business and they all give free estimates anyway.
99% of trussed roofs everywhere are 24" o.c., It's just one of those things I have a real problem with for a variety of reasons.
Gonna call a couple of manufacturers today and see what's up. No real slowdown here so I'm not sure how the hunger factor will play into it.
Let ya know how it pans out.The best reward for a job well done is the opportunity to do another.
"99% of trussed roofs everywhere are 24" o.c., It's just one of those things I have a real problem with for a variety of reasons."
Just curious - Why is it that you have a problem with that? Do you prefer wider or narrower spacing?
Learn from the mistakes of others. You can't live long enough to make them all yourself.
OK, for one thing I'm a huge fan of OSB when properly installed, but IMHO a proper installation requires 16" O.C. spacing. Yes, regular old 7/16" OSB, 16" O.C., no "H" clips.
I just think that OSB lies flatter and I've never seen it de-laminate, even after prolonged exposure. Doesn't mean it ain't never happened--I've just not seen it.
I have seen 5/8" ply so bowed and warped that it took two men to nail it down, then the areas between the 24" O.C. trusses STILL had to be blocked.
Truth be told Boss, I'm not crazy about trusses in general, but in this application their ability to clear-span the 50' shop makes them a superior choice.
Just my experience here, hope I answered your Q. The best reward for a job well done is the opportunity to do another.
upgrade to a true 1/2 in osb and will eliminate your worries!
Trusses are great, timesaver and can clearspan great distances.
Absolutely correct for this application. How else could I hope to clear-span this 50' shop?
Everything's got its place.The best reward for a job well done is the opportunity to do another.