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One Shim Leads to Another Shim
Once you start shimming you will have to do it every time your floor sags down again.
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Concrete Blocks can't support a settling Foundation
Concrete blocks only add to the weight on the soil making it more susceptible to settling.
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Shimming to the Extreme
Shimming can get extreme after a while. Your more than likely to run out of wood before you fix your settling issue.
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Shimming only worsens the issue
When a pier settles the wood around it bends causing the floor to sag. Without a permanent correction the wood will only get weaker after each shim. This causes more damage in the long run.
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Woodwork is Vital
If your home's joist are in bad shape due to bad wood work then shimming can even further damage it. Sound support is needed underneath your home.