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Posted by Jeff Dieterle on August 10, 2007, 2:06 pm
Thanks for the reply Bob, yes headers instead of plates and you've correctly
figured out what I was trying to describe. Thanks for the link regarding
span tables. Any idea where I would find the rest of the reference material
to size & space properly everything I want to do. I wanted 100lb/sqft
because I plan to store several (15-20) jukeboxes in this loft and they
average 350lbs each.
>> Just finished having a 16' high 40'x40' addition built on to an existing
>> polebarn. I wanted to build a loft over 1/2 of the addition for storage.
>> Want to design for a 100lb/sqft liveload. My plan was to duplicate the
>> endwall poles placed on 8ft centers with doubled 2x12 plates to rest
>> 20ft
>> engineered lumber joists on 16" spacing covered with 3/4 t&g plywood.
>> Does
>> anybody know of a link to get the loading and span distance for
>> engineered
>> lumber or better yet if my design will get me to my live loading target.
>
> Jeff-
>
> A couple comments....
>
> First I think I understand your framing system.
>
> By 2 x 12 "plates" do you mean "header"?
>
> The 2x12 double headers would span between the poles & the 20 ft
> joists would span between the headers?
>
> If so.... a back fo the envelop calc tells me that the 2x12's are
> undersized; you're asking them to carry about 1200 lbs per ft.
>
> You CAN go 20 ft @ 100 psf with engineered timber but I'm guessing
> you'll have to go with a 14" deep joist AND drop to 12" oc spacing.
> The 3/4 T&G is of course fine.
>
> But as everyone always says "you should have this engineered by a
> local guy"
>
> for span tables (actually these tables don't go to 100psf, need to be
> be calc'd)
> go to www.apawood.org & reigster (its free)
>
> & download I joist publication
>
> APA Performance Rated I-Joists
> Includes information on Span Ratings, installation details, cantilever
> designs, architectural specifications and engineering design
> properties for APA Performance Rated I-Joists. Only available as a
> downloadable pdf file. Revised April 2004. (Form Z725 - 22 pages)
>
>
>
> cheers
> Bob
>
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