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Re: WOOD: "Engineered Wood Costs"

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You can get them in a special order.  In one of my jobs,
last year, I specified 12" deep wood I's spanning 26' for
the same situation as yours.  The framer's lumber company
supplied 2x12 in 28-29' lengths.
Gary

On 9 Nov 2004 at 10:29, Jordan Truesdell, PE wrote:

> The answer is, yes, engineered lumber is much more expensive.  The
> rafter in question is about right, $2-$3 per board foot is what I'm
> used to seeing. This is about 4 times a S Pine No2 member at
> 50-65c/BF.   When I designed a vaulted section for my own house, and
> found out what a 3.5x16 PSL ridge beam would cost, I though I'd just
> get it as a timber section in WRC. At the time the cost for WRC was
> about 1.75-2.00/BF, similar to the PSL.  That was a great idea until I
> got a member size somewhere in the 10x24 range.  All of a sudden, it
> was not economical.
> 
> I use the spacing trick in Sizer to check doubled rafters and haven't
> had problems.  (Actually, I have to use lots of tricks to get Sizer to
> give me the output I really want sometimes).
> 
> BTW - where is this guy going to get 28-30' 2x12s (26' span plus ridge
> cut and tail)? Maybe he was planning on using a pair of 16' 2x12s with
> a Simpson Mending Plate in the center?
> 
> At 08:43 AM 11/9/2004 -0600, you wrote:
> >ALL:
> >
> >Thanks for the responses so far.
> >
> >I wrote before I had gone back in to my calculations to figure out
> >what was controlling things. It turns out that the problem is WIND
> >UPLIFT--a fact that you'd think I'd remember since I was discussing
> >it here about that time--too many jobs, not enough brain cells.
> >
> >One thing I noticed is that Woodworks 2002a, which I am using, does
> >not allow "n-ply" members to be considered when sizing roof
> >joists/rafters. You can "trick it" by halving the spacing, I suppose.
> >
> >Anyway, I have been able to fiddle with the design parameters (mostly
> >wind uplift) to get a TJI to work. I think the TJI is probably
> >competitive; definitely so if the alternative is putting in a beam,
> >etc.
> >
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> Jordan Truesdell, PE
> 
> 
> 
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