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smata67 05-18-2012 10:40 AM

Leveling a Pad w/ 2" per 10' slope
I'm getting a shed built on Monday. It will have a wooden floor with 3 4x4s and will be set onto an existing pad. The pad is not level, it was built with a slope (has not shifted). Facing the shed (and the ends of the 3 4x4s it sits on), the pad is 2" higher on the left edge than on the right edge. It is 10' wide. The builder plans on shimming up the difference with roof shingles. I'm thinking that I could potentially level up the pad with an early strength concrete (1500 psi in one day). The new concrete would be a fraction of an inch thick under the first 4x4, 1" thick on the center one, and about 1 3/4" thick on the third. Is it a good idea to do this or will it just break up and create a problem? I would use a bonding agent between the old and new.

jaydevries 05-18-2012 12:04 PM

i like to use aluminum shims 3"x3" 1/8" thick under 4x4 spaced out as needed
no rust, will not crush, fast and easy, and allows water to drain off of pad as needed

jogr 05-18-2012 10:57 PM

2" is way too much to shim with shingles or 1/8" shims. Switch the 4x4s to 4x6s and cut a 2" taper into them.

kwikfishron 05-19-2012 05:28 AM

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I agree with jogr on this one.

This would be no different building a ground level deck over an existing sloped patio slab where there is no room for a typical post and beam construction.

You need to discuss this with your builder and veto his plan.

I would be concerned with anyone that would build anything on a 2” stack of roofing.

And yes your 2" to nothing pour you're thinking of is problematic too. You're actually better off with a slope.

smata67 05-20-2012 04:07 PM

Good idea to cut the slope into the supports, but 4x6 are not easily available. I'm thinking to have him add a 1x4 to the middle 4x4 and a 2x4 to the lowest one to make up for the slope, then the shimming is minimal. I already have the wood in both plain and treated. It is a professional out-building builder coming out tomorrow that built another shed for me 12 years ago that is still looking pretty good. I called him 10 times last week to discuss but never got ahold of him. It took 6 weeks to get on his schedule. Office girl told me about the roofing shingle shimming, he probably will agree that is a bit much, I'll see tomorrow.

TRUEPRO 05-21-2012 11:25 AM

Fire any builder who wants to shim 2" with shingles.

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