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Old 11-26-2008, 02:08 PM   #1
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Structural issue


I have just completed a barn for my horses and now need to construct a hay loft. The loft floor will be 13 feet wide and 20 feet long with a capacity of approximately 10 tons of hay. Joist span is 12 feet, with joists seated on a double 2x12 stringer each side. The obvious choices for joists are dimensional (planed) 2x12s and engineered 11 7/8" I-joists. Rough cut lumber would be less expensive than either of these. Where does rough cut lumber fit in with these two products with regards to strength? I assume it to be between the two?


Last edited by dwkerch; 11-26-2008 at 02:11 PM. Reason: spelling error
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Old 11-26-2008, 03:19 PM   #2
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Structural issue


Rough cut is the same as it's finish planed counterpart. A 2x12 rough #2 piece of lumber carries the same capacity as a 2x12 # 2 that is surfaced on 4 sides (S4S).

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Old 11-26-2008, 04:57 PM   #3
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Structural issue


If you want a specific answer, try and find out the species of wood that you can get because it does make a big difference. All of the books and tables I've seen need the species.

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Old 11-27-2008, 02:43 AM   #4
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Structural issue


Yes friend,you are rigth.Thanks for good comment.

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Originally Posted by Maintenance 6 View Post
Rough cut is the same as it's finish planed counterpart. A 2x12 rough #2 piece of lumber carries the same capacity as a 2x12 # 2 that is surfaced on 4 sides (S4S).
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Old 11-27-2008, 08:05 AM   #5
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Structural issue


My first choice for lumber would be GOOD old brige planks spaced pretty close. there is ALOT of weight and most haylofts bowed under that full load(in old barns). we werent allowed to go over 4 or 5 bales high (those small square idiot bricks we had back then) . where we split the span with extra support underneath,,,we stacked straw to the 30' rafters,,,about 25 bales high or MORE!!! Your barn and loft is going to get too small anyway so make it strong enough you can go to the rafters to start with. Best place to find those discarded or salvage planks is your county yard that has to replace old wood bridges every day. those cresoted or treated planks will last a LONG time,,,inside a barn,,,longer than the barn. This is for small square bales of horse hay,right? how heavy of bales and how high from loft floor to top of rafters?? Compute the live load per square foot and see if somebody here can help with those charts. Most bridge planks are 3" at least,if not more!!

other option,,,if you have trees or can get some,,,is to have your own sawn at a local saw mill or old threshers demos once a year!! Thats how the settlers did it!!
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