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RE: Concrete slab repair

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> -----Original Message-----
> From: jccpc
> Any suggestions for adding three to four inches of concrete on an existing
> slab? The slab has been previously abraded in unsuccessful attempts to
> install a topping and there needs to be a new radiant heat system
> installed
> in the new concrete ( a grid of 1 inch pipes, typically attached to any
> reinforcement), necessitating a layer of insulation between old and new.
> Particular concerns will be crack control and curling.
> The reason for the contractor abandoning the topping repair was the poor
> quality of the substrate, revealed during scarifying. Replacement of the
> slab is not an option.

Questions rather than answers...

What is the function - office/warehouse/industrial/light vehicles/heavy
vehicles, etc
Do you _need_ the insulation? - isolating the new slab from the base slab
reduces the ability of the slab to distribute point loads because of the
flexibility of the insulation
Is the slab interior or exterior?
Are the heating pipes in both directions? (unusual in my experience) - 1?
pipes represent a significant local loss of concrete section

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