Lumber Storage: Engineering questions

I just scored some wide cherry boards at an auction for just a few dollars. The problem is that this lumber is in my garage, on a couple of tubafoors. My car is out on the street.
I have a bunch of lumber stored in my basement: maple and oak, mostly. I counted, and I'm up to 105 boards. Probably around 500 board feet.
I have some space under the heating ducts in the basement/workshop. It's good to fill the space, so I'm not tempted to walk through it and bang my head on the corner of the ducts. So I'm limited to 65" in height, if I leave 2" of clearance.
Here's my plan: Build three or four columns. Each column has a pair of 2x6s as vertical elements, on either side of six two-by-four shelves (unless I go with three columns, then I use 2x6s for the shelves as well as columns). Here's a drawing: ____ ______________________\ |____|<--2x6 end |______________________/ __________|.2..|__________ |2|___| | | |___| | \ |___2x4____ .x.. ___Edge___| |x|___| | | |___| | | 6 | |6| | | | | | | ___________|....|__________ | |___| | | |___| | |___2x4____ .F.. ___Edge___| |E|___| | | |___| | | a | |d| | | | | | | ___________|.c..|__________ |g|___| | | |___| | |___2x4____ .e.. ___Edge___| |e|___| | | |___| | | | | | | | | | | | ___________|....|__________ | |___| | | |___| | |___2x4____ .... ___Edge___| | |___| | | |___| | | | | | | | | | | | ___________|....|__________ | |___| | | |___| | |___2x4____ .... ___Edge___| | |___| | | |___| | | | | | | | | | | | ___________|....|__________ | |___| | | |___| | \ |___2x4____ .... ___Edge___| | |___| |....| |___| |../ |__| |____| |__|<-2x4 end |_|...|_|....|_|...|_|..\ Front View 41.5" wide Side View... 8 feet long
Anyway, the rest of the design constraints are that it needs to be free standing, and preferably knock-down (so I could move it out of the basement if the day arrives...)
On each shelf, I was planning on storing three stacks of boards, each stack roughly 6" wide. Each stack would have five boards and four stickers; roughly 9 inches of height. An inch and a half for the 2x4s, and I have 10 1/2" per shelf, and a total height of 63". Add 1.5" for the bottom runners, and I can just barely fit this all in. Of course, the stickers will be "1x1"s, which actually measure 3/4ths of an inch on a side, so there's a little room to spare.
I couldn't get sagulator <http://www.woodworkersweb.com/sagulator.htm to fess up how to calculat deflections for cantilevers, so I doubled the weight and the span and figured that would be about right. It said the deflection would be around an eighth of an inch, depending on pine variety. I don't think I'm up to going through my twenty-year-old knowledge of mechanics-of-materials to actually calculate the deflection myself.
Will it stand? Fifteen boards on each side of each self will weigh roughly 280 lbs. 560 lbs. per shelf. 3360 lbs total. Can 8 vertical 2x6s handle 3360 lbs? 420 lbs each? Could I go with only six? 560 lbs each? How about if I dado the 2x6s a half inch for the shelf 2x4s? Will it need cross-bracing?
I was thinking 3 #8 or #10 wood screws at each shelf-riser joint (36 screws per column; 3 or four columns).
To hold the columns together, a pair of hanger bolts into the top of each riser, with a washer and nut holding the top plate on. Recessed 2"x 1/4 bolts hold the bottom shelf onto the bottom runner (and I get to buy a forstner bit set...)
Comments? Overkill? Not beefy enough?
Chris
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I fail to see the problem.
todd
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wrote:

me either... if I had a separate or detached work shop, I might allow 1 car in the garage, providing it left enough storage for my stuff... lol
IMHO, cars & trucks have a much better exterior finish than my tools and lumber, so they can live outside.. priorities??
Mac
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mac davis wrote:

How big is this stuff? Would it fit on 1x2s under kids' beds? Could you set it up onto "shelves" in the garage above the level of the car? Any place above the car? Set out on rafters?
Josie
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2X4s will easily carry the vertical load. You don't need shelves, just horizontals between the columns, so 2X4 columns and 2X4 horizontals, with four 3" sheetrock screws at each overlap. If you want to add strength at the overlaps, put a 6" piece of 1X4 on the column face below the horizontal with four 2" sheetrock screws. If the wood is dry, you don't need stickers, Can you run a couple of the columns up to the floor joists? That would eliminate the need to brace for side loads. I have just such a rack, with four or five times the load you are looking at. It's 16 ft long and ties to the floor joists above. Four sets of columns. It's more thna half full of all sorts of wood. Wilson

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I went shopping last night, and decided to splurge and get 2x6s. Stability.

We're on the same page. My "shelves" are the flat 2x4 arms sticking out. If I have a need to store cutoffs, I'll make a plywood shelf with cleats to go over the arms for one of them.
I'm planning on using 3 #12 x 2 1/2" wood screws at each riser/arm joint. The risers will have a 1/4" dado cut into them for each arm.

The bottom joint will get reinforced with the hollow below and above the bottom arm filled in with cutoffs.

That was my original plan. But this is going under air ducts, and there isn't much gap between them, and there's already a nat'l gas pipe running in the gap. Not enough room to work to attach to floor joists. So I figured I'd make it solid enough not to need the ceiling attachment.

Only four sets of columns? Four feet apart? Do you worry about sagging?

Chris
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Following up to myself...
In article

Thanks all for the input. I'm starting construction tonight, with wildly optimistic hope that I'll be done by Monday night.
Pix will be posted on alt.binaries.pictures.woodworking...
[ snip ]


Chris
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You gotta start makin some sawdust.

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[ too much lumber in inventory ...]

Yeah, I know. I have so little time. And then I spend a saturday after a little pile of wood (probably 70 board feet or so). Some really wide boards. Looking at the wane and the knots, I can tell several were cut from the same bole. Some boards 14" wide. Maybe a shy thin to sell as 4/4. And I spend less than $100, and get a bunch of other junk as well.
And there's more wood for auction on Sunday.
Chris
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