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Old 10-04-2010, 10:59 AM   #1
chuckster
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Default How Much Weight can be stored in the attic over the Garage?

Ok, I know this is going to bring out the contractors..

I have a 2 car garage with a folddown ladder to get up to the attic. The trusses are have about a 10' wide by maybe 4 ' high space. There is already plywood down.

I want to store my steel hurricane panels up there..I think the rafters are 24" OC..

The Panels are Corrugated Steel about 18" wide by 6' high. maybe 30 or so...

With the load spread out across the floor, should it be able to handle it?

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Last edited by chuckster; 10-04-2010 at 02:08 PM.
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Old 10-04-2010, 11:01 AM   #2
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5 lbs less than its capable of holding

i'll be here all week

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Old 10-04-2010, 11:05 AM   #3
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How much does each panel weigh that you intend to store?

An attic floor that has a plywood deck will hold a lot of weight but stop before the sag. Moving around topside with long shutters may become the hard part.
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Old 10-04-2010, 11:16 AM   #4
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Draw a diagram of the truss in profile view.
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Old 10-04-2010, 11:35 AM   #5
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hurricane panels = deceased SO
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Old 10-04-2010, 11:36 AM   #6
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Quote:
Originally Posted by pewter99 View Post
hurricane panels = deceased SO
Oh. I'm sure that it will hold that.

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Old 10-04-2010, 11:38 AM   #7
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Quote:
Originally Posted by pewter99 View Post
hurricane panels = deceased SO
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Old 10-04-2010, 11:38 AM   #8
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has it held you?
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Old 10-04-2010, 11:38 AM   #9
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Quote:
Originally Posted by smearig View Post
Draw a diagram of the truss in profile view.
I'll shoot a picture when I get a chance..
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Old 10-04-2010, 11:43 AM   #10
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What are the main truss joists? Engineered? Dimensional lumber? What size?
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Old 10-04-2010, 11:44 AM   #11
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How much would you estimate them to weigh?
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Old 10-04-2010, 12:05 PM   #12
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My neighbors fell in. The contractor did a poor job of structural work, not intended for an attic load. I had my builder repair it for him by adding a beam below the ceiling and sheetrocking it in. His garage ceiling was 9 ft so adding a 12 inch beam didn't cause a problem.

My last house a 2 story with basement garage below the main floor, the builder got nervous and added a 3 inch steel colum in the center of the 2 car stalls to support a 22 ft long beam.

It didn't seem like a problem when we bought the house but it screwed up the center isle for walking between vehicles.
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Old 10-04-2010, 12:11 PM   #13
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Quote:
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My neighbors fell in. The contractor did a poor job of structural work, not intended for an attic load.LJ
What did he put up there?
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Old 10-04-2010, 12:14 PM   #14
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Quote:
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What did he put up there?
late night heffalump party....
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Old 10-04-2010, 12:49 PM   #15
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Quote:
Originally Posted by chuckster View Post
What did he put up there?
Usuall attic junk. It was 3 stalls wide, but a really poor framing job. But typical of residential construction around here. If I had to guess the origional framing plan was modified to make a 3 stall garage out of what was to be a 2 stall.

Mine is 3 stalls wide, no columns, but they used T beams in lieu of joists.

LJ
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Old 10-04-2010, 02:08 PM   #16
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Pics posted at top
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Old 10-04-2010, 02:25 PM   #17
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Quote:
Originally Posted by smearig View Post
Draw a diagram of the truss in profile view.
I posted a few pics..
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Old 10-04-2010, 05:22 PM   #18
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Ok where are the experts?
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Old 10-04-2010, 05:26 PM   #19
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It appears that you've already put them up there, since they haven't fallen, it's my professional opinion that they'll hold
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Old 10-04-2010, 05:43 PM   #20
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You don't have to worry about snow loading, and you have already tested it I see.
By any chance did you measure the ceiling height before and after you put that much weight up there.

Just look at the bottom chord of the trusses. The way they are loaded with metal and plywood floor stacked on the bottom cord you are putting all the stress on the nailed joints of the bottom cord. Not good. The truss is designed for a load on the roof so that the entire truss is carrying the load.

I would recommend some all thread rod reinforcing of the bottom cord connection, before the nails pull out. You might want to put some temporary colums below untill it's reinforced.

That truss is just not designed to be loaded that way. Remember the Kansas City Motel walkway that gave way killing several people. It failed because of the hanger rods connections not the structure.

Just look at those nailer joints, they are for truss loading from the roof, placing the nailed joint in compression. With weight on the joist they are now in tension.
LJ

Last edited by LarryMJones; 10-04-2010 at 05:45 PM.
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Old 10-04-2010, 05:43 PM
 
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