Can I shim a synthetic pad?


  #1  
Old 11-02-17, 06:27 PM
L
Member
Thread Starter
Join Date: Apr 2017
Posts: 40
Received 0 Upvotes on 0 Posts
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"

 
  #2  
Old 11-03-17, 06:05 AM
P
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 27,098
Received 2,009 Upvotes on 1,801 Posts
If the pad is totally supported by the concrete pad underneath how will it sag in the middle?
 
  #3  
Old 11-03-17, 12:55 PM
W
Member
Join Date: Feb 2006
Location: USA
Posts: 6,381
Received 63 Upvotes on 55 Posts
Pad

Add a wedge shaped layer of fresh mortar under the entire pad to make it level.
 
  #4  
Old 11-03-17, 05:22 PM
J
Member
Join Date: Jan 2011
Location: USA
Posts: 4,463
Received 128 Upvotes on 113 Posts
OK, what kind of tank?
Why does it need that added pad?
 
  #5  
Old 11-07-17, 03:25 AM
L
Member
Thread Starter
Join Date: Apr 2017
Posts: 40
Received 0 Upvotes on 0 Posts
Originally Posted by joecaption
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.
 
  #6  
Old 11-07-17, 03:34 AM
L
Member
Thread Starter
Join Date: Apr 2017
Posts: 40
Received 0 Upvotes on 0 Posts
Originally Posted by Pilot Dane
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.
 
  #7  
Old 11-07-17, 03:37 AM
L
Member
Thread Starter
Join Date: Apr 2017
Posts: 40
Received 0 Upvotes on 0 Posts
Originally Posted by Wirepuller38
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.

 
  #8  
Old 11-07-17, 03:45 AM
L
Member
Thread Starter
Join Date: Apr 2017
Posts: 40
Received 0 Upvotes on 0 Posts
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?
 
  #9  
Old 11-07-17, 04:18 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 45,500
Received 800 Upvotes on 703 Posts
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.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: