Do I need to add something to bind deck mud to concrete when putting down my...

penguin_pam

Many videos online seem to use kind of thinset to bind the deck mud to a concrete foundation. Is that necessary? If so do I use thinset, and if so which one should I prefer (unmodified and modified)? Or, do I use something like a concrete binding agent which seems even more special purpose and made for this?

Originally asked by Evan Carroll on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

If you are pre-sloping prior to a PVC liner, just use dry-pack. That mud base should be sitting in a depression or within a framed base. It does not need to bind to the concrete that is the foundation. However most of the time the PVC liner is laid out first and the mud base is set in that with the slope built into the Dry-pack base. I then coat the mud base and the walls with a waterproofing like RedGuard or AquaDefense. Then it is very unlikely that any water gets to the liner.

Full answer by RMDman: https://diy.stackexchange.com/a/314069 (CC BY-SA 4.0).

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