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Old 01-14-2019, 12:43 PM   #1
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Shed Leveling


I'd like to build a free-standing small 4x8 foot lean-to garden shed in my back yard up against my house. I have an existing concrete slab I'd like to set it on. The problem is the slab is graded slightly for drainage- maybe a half inch along the 4' span.

What's the best way to level the shed? The floor will be framed with 2x4 PT 16" on center. It needs to be a stand-alone free-standing shed, so building off the house is not an option.

Should I just use shims? Set it on a couple PT skids and cut the skids to the slope of the grade?
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Old 01-14-2019, 02:27 PM   #2
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Re: Shed Leveling


Just build it flat and set it on the slab - 1/2" slope over 4' ain't gonna matter
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Old 01-14-2019, 04:02 PM   #3
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Re: Shed Leveling


2X4 will bounce if you shim one end.

So, if you require a level floor, you'll have to shim every 12 - 16" inches if you want to eliminate bounce.

The far easier way would be to use 2X6 and rip them so the the floor joist go along the 8' length.

First joist near the house is 4" and the last one at the front of the shed would be 4-1/2" to get the level you want - the other two split the difference at about 4-5/32 and 4-5/16. (Yes gang, decimals work better than going to 64th's for framing...)
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Last edited by Domo; 01-14-2019 at 04:05 PM.
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Old 01-15-2019, 09:11 AM   #4
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Re: Shed Leveling


Build the front and back wall, do the rafters then build the side walls in place to fit, no problem
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Old 01-15-2019, 04:54 PM   #5
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Re: Shed Leveling


As mentioned just build it on slab, don't worry about it. Most porches, decks and slabs should be off level due to drainage anyway. The snow will melt off easy and if you leave the doors open by accident and a big rainstorm comes up
(it happens) it will drain out the door and not migrate towards the house. I build the off level all the time at least a bubble. Make sure you use pressure treated lumber for the lower plates bolted down good.
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