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Cost Differential

Cost Differential

Cost Differential

(OP)
Hey all,

I am wondering if anyone could give me the rough cost differential between a 52' clear span 5:12 wood truss vs. a 52' 5:12 wood truss with interior bearing points in roughly 1/3 locations.  I am in the preliminary stages of design and I am curious as to the differential b/c I would need to add additional footings under bearing walls if interior bearing points were used.  One other consideration is that this is a 12 truss set, and 2 of them will HAVE to span 52' as there is no interior bearing available.  So maybe it would just be cheaper to do just one design and be done with it.  

Thanks in advance for any help!

RE: Cost Differential

You are probably right ----

Just for grins - call your local supplier and simply ask!!

They usually can run those numbers in a matter of minutes.

Multi - bearing trusses will probably be out of 2x4's and clear span will be 2x6 or even 2x8 depending on your local snow loads.

RE: Cost Differential

If you can have two bearings, the cheapest route is to make a symmetric 3 piece truss system with a single profile mono truss on each end. So if you have 12 one piece trusses, you would have 24 monos of one profile and 12 center trusses with high heels matching the end heel height of the mono. Everything can be easily made out of 2X materials. I know this is the cheapest way to do the trusses, you would have to decide if that would offset the addition of those interior bearings. Don't forget crane fees for handling those 52' trusses.....you can't just jerk them up there with a rope tied to the peak. A clear span 52' truss is gonna be 500-600 pounds and flimsy.

RE: Cost Differential

I also never like bearing stiff trusses on more than 2 points - there is a large potential for uneven supports playing havoc with your load distributions.

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