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Old 12-20-2011, 05:26 PM   #1
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Garage Floor


Is it possible to build a garage floor from wood, that will support a 1500lb single axle 6x12 trailer?

I would rather not go the route of concrete, and would rather build this to be incorporated with my already existing 12x16 workshop which has a wood sheething floor.

I guess I was thinking if spaced the joists on 16 inch centers, and using 4x4 treated posts throughout the structure.

The floor would be supported approximatley a few inches from the ground, so I am not sure if this is even possible. As where I have my most concern is not with the joists, but with the sheeting not being able to support the weight.

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Old 12-20-2011, 06:07 PM   #2
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They make 1 1/8" sub-floor plywood. And I would go 12" o/c; that way you can park anything on it.

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Old 12-20-2011, 06:13 PM   #3
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They make 1 1/8" sub-floor plywood. And I would go 12" o/c; that way you can park anything on it.

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Thanks !

I will look to see if I can find this on one of the online sites.

When you say 12" o/c , what size joist would you reccomend?
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Old 12-20-2011, 06:17 PM   #4
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Thanks !

I will look to see if I can find this on one of the online sites.

When you say 12" o/c , what size joist would you reccomend?
What span are we talking?
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Old 12-20-2011, 06:21 PM   #5
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What span are we talking?

12' . it will be a 12x24 structure, figure I will run the span on the shortest distance.

Any idea if I can find pricing for the 1 1/8 subfloor online ? I am in Iowa.

I plan to utilize supports at either 4' or 6' with 4x4 and blocks in the center. The outer area will be set posts.
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Old 12-20-2011, 11:07 PM   #6
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1 1/8" plywood is not an issue....I have 20 sheets sitting up on my 2nd floor joists right now waiting to be put in place....I think it cost me about $35/sheet.....

But I have to ask why you want wood instead of concrete? It will NOT last for ever....especially if you have any moisture.....and when you consider the total cost for labor and materials....I don't think you will be saving any money. If my math is correct....your looking at around 4 yards of concrete....

4 Yards of concrete....delivered...$500?
Rebar....$50

9 sheets of 1 1/8" plywood...$350
All the wood that needs to go under it....$100+

Labor of the wood floor vs concrete? I would speculate that the wood would be about 3 times the labor.
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Old 12-21-2011, 01:28 AM   #7
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Concrete would be less expensive.
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Old 12-21-2011, 01:40 AM   #8
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Concrete would be much cheaper... Put concrete down, then you can put cheap plywood or whatever kind of wood over the concrete if you want the aesthetics.

Wood is definitely not the way to go for a garage floor. A Deck? sure, a garage? negative.
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Old 12-21-2011, 03:52 AM   #9
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Concrete would be less expensive.

well the reason I was considering wood, was the area where this is going has a drop off to the grade at about 12' and would require me to fill in about a foot to make it a level spot for concrete.

I wasnt sure the best way to go about doing this.

I was guessing with the prep and concrete it would be less expensive than just going the route of a wood structure.
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Old 12-21-2011, 04:17 AM   #10
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1 1/8" plywood is not an issue....I have 20 sheets sitting up on my 2nd floor joists right now waiting to be put in place....I think it cost me about $35/sheet.....

But I have to ask why you want wood instead of concrete? It will NOT last for ever....especially if you have any moisture.....and when you consider the total cost for labor and materials....I don't think you will be saving any money. If my math is correct....your looking at around 4 yards of concrete....

4 Yards of concrete....delivered...$500?
Rebar....$50

9 sheets of 1 1/8" plywood...$350
All the wood that needs to go under it....$100+

Labor of the wood floor vs concrete? I would speculate that the wood would be about 3 times the labor.

I havent called to get exact pricing on a yard of concrete recently, but I certainly wouldnt consider it if it is that high. Not too long ago I was quoted $75/yrd delivered. But the prep for the area is where I am not sure how to go about leveling it. Using concrete to level, gets expensive.

In my current 3 car garage with concrete slab, I have moisture problems all the time with it coming up through the floor.

For this new structure, it will only house a 6x12 enclosed trailer, and will NEVER see an automobile.

labor is not an issue, this will be all on me.
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Old 12-21-2011, 04:53 AM   #11
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I havent called to get exact pricing on a yard of concrete recently, but I certainly wouldnt consider it if it is that high. Not too long ago I was quoted $75/yrd delivered. But the prep for the area is where I am not sure how to go about leveling it. Using concrete to level, gets expensive.

In my current 3 car garage with concrete slab, I have moisture problems all the time with it coming up through the floor.

For this new structure, it will only house a 6x12 enclosed trailer, and will NEVER see an automobile.

labor is not an issue, this will be all on me.
If its never going to see an automobile, 16" o/c 2x8's would probably be alright.
12" o/c would be over-kill.
And I would think it would be a good idea to lay some plastic down to help control the moisture.
You may want to go with treated joist material if you're close to the ground.

Last edited by titanoman; 12-21-2011 at 04:58 AM.
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Old 12-21-2011, 06:19 AM   #12
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If its never going to see an automobile, 16" o/c 2x8's would probably be alright.
12" o/c would be over-kill.
And I would think it would be a good idea to lay some plastic down to help control the moisture.
You may want to go with treated joist material if you're close to the ground.

Thats what I am thinking as well, only I had on my list of materials 2x10's. I had already planned my list for treated materials in the floor.
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Old 12-21-2011, 07:16 AM   #13
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Thats what I am thinking as well, only I had on my list of materials 2x10's. I had already planned my list for treated materials in the floor.
I almost suggested 2x10's, but then I figured a camper trailer can't weigh that much.
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Old 12-21-2011, 08:17 AM   #14
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I almost suggested 2x10's, but then I figured a camper trailer can't weigh that much.

I have a bad habit of over-building things.
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Old 12-21-2011, 08:31 AM   #15
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I have a bad habit of over-building things.
I do to. I keep thinking I'm sill in California. But I don't like spending the customers money unnecessarily if they don't need to.

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