Can I shim a synthetic pad?

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Old 11-02-17, 05:27 PM
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Can I shim a synthetic pad?

https://www.grainger.com/product/DIV...rchQuery=4e873

Its going to sit on poured concrete which has a bit of a slope.

Think this could be shimmed properly so the middle doesnt "sag"?

The tank that will sit on top weighs about 1500 pounds.

Looks square in the pics but the pad's dimensions are actually 48"x36"x2"

 
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Old 11-03-17, 05:05 AM
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If the pad is totally supported by the concrete pad underneath how will it sag in the middle?
 
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Old 11-03-17, 11:55 AM
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Pad

Add a wedge shaped layer of fresh mortar under the entire pad to make it level.
 
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Old 11-03-17, 04:22 PM
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OK, what kind of tank?
Why does it need that added pad?
 
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Old 11-07-17, 02:25 AM
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Originally Posted by joecaption View Post
OK, what kind of tank?
Why does it need that added pad?

Its an upright Roth oil tank.

I want the pad to ensure that the tank is clear of any standing water that sometimes accumulates after heavy rain.
 
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Old 11-07-17, 02:34 AM
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Originally Posted by Pilot Dane View Post
If the pad is totally supported by the concrete pad underneath how will it sag in the middle?

The concrete has a slight slope to it.

If the end of the pad is shimmed, I'm thinking that the middle might sag.
 
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Old 11-07-17, 02:37 AM
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Originally Posted by Wirepuller38 View Post
Add a wedge shaped layer of fresh mortar under the entire pad to make it level.

I believe the bottom of the pad looks like this, not sure if this will present a problem for the mortar.

 
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Old 11-07-17, 02:45 AM
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I'm also being told that I cant pour a concrete pad on top of already existing concrete because it will have no room to expand.

Can someone confirm?
 
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Old 11-07-17, 03:18 AM
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You can pour concrete over old concrete but if the overlayed part is less than 2" there can be bonding issues. When doing that it's best if the new pad is larger than the existing with the edges of the new being 4" thick or so.
 
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