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Marke016024 12-03-2011 06:24 PM

Garrage attic subfloor
 
Hi all,

I am thinking about putting a subfloor in above my garrage. Currently I have a drywall ceiling with just 2x4's and would like to store things that are light like clothes and kids toys in this space. I have one major concern and that is if this setup will support what I am want it to? and also what kind of plywood or OSB should I use for the floor? Oh yeah there is no insulation in case anyone needs to know this.

I dont care about drywall cracks since its the garrage or a little bit of floor warp.

joecaption 12-03-2011 06:40 PM

That means it's nonstorage trusses. There never intended to have any form of storage on top of then. It you do they may crack.
If you insisting on using it for storage then sister 2 X 8 to the 2 X 4's from on top of the outside walls and screws and constrution adhesive them together and use Advantex subflooring.

Ron6519 12-03-2011 06:42 PM

The 2x4 ceiling joists are inadequate for storage, unless you're a fan dancer.

Marke016024 12-03-2011 06:57 PM

Quote:

Originally Posted by joecaption (Post 785238)
That means it's nonstorage trusses. There never intended to have any form of storage on top of then. It you do they may crack.
If you insisting on using it for storage then sister 2 X 8 to the 2 X 4's from on top of the outside walls and screws and constrution adhesive them together and use Advantex subflooring.

Ok, so if I sister these studs up the way you configured them I will need 2x8's that run the entire 20' lengths? there is no joining trusses right?

Thanks for your help! Its either this or a big ugly shed in the back yard.

titanoman 12-03-2011 07:05 PM

2x8 spanning 20' will still be spongy, even scabbed to the trusses. You need to check local codes as this will be considered a live load. You may need to go to 2x10.

AndyGump 12-03-2011 07:19 PM

If your jurisdiction will allow for 10 lb. dead load and 30 lb. live load for the garage storage then you could do Dug Fir #1 or Southhern Pine #1
2x10s 12" OC

or SP #2 and DF #2 2 x 12s @ 16" OC

Andy.

woodworkbykirk 12-03-2011 08:37 PM

where are you going to find 20' 2x10. and secondly how are you going to even be able to get them up in the attic. to install them..

kwikfishron 12-03-2011 08:45 PM

Quote:

Originally Posted by woodworkbykirk (Post 785331)
where are you going to find 20' 2x10.

At just about any lumber yard (not box store) in the USA.

Quote:

how are you going to even be able to get them up in the attic. to install them..
Now there's the 64k question. :)

AndyGump 12-03-2011 09:46 PM

Who are you guys trying to B-S?

You both know the answer to that one.

Andy.

Marke016024 12-04-2011 07:21 PM

im back
 
Ok Im back with more information, the 2x4's are part of an enginered truss support system. does this make a difference? I imagine this is stronger than just the joists alone.

Big Stud 12-05-2011 12:00 PM

I have trusses as you describe in my garage. Engineered out of 2x4's, with just over a 4' space at the bottom of the triangle that goes down the center of the garage, I took 3/4" osb TG sub flooring and cut it lengthwise down the center. I had to do that to get the sheets up into the space to nail it down. I cut the first one to length to make it break at a rafter on the center and ran it the entire length of the garage. I have stored lightweight stuff in there for years like xmas decorations and such without any problems. I am a fair sized guy and have climbed up there regularly and it feels plenty solid to me. I say it can be done without fear as long as you don't plan on storing boat anchors up there :thumbsup:


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