I’ve got a suspended slab that’s going to be exposed to the elements for close to a year. It’s already seen about 8 months of weather and has, of course, several hairline cracks.
I’m considering sealing it with Sonneborn Kure N Seal, just to keep water away from the reinforcing steel and to protect it from freeze/thaw cycles.
My concern is that I’ll (someday) be installing ceramic tile on portions of this floor. The data sheet on the Kure N Seal says
“Do not use on surfaces to receive concrete overlays or
additional toppings, coatings, sealers, or ceramic tile without
proper surface preparation.”
My question is: What is proper surface preparation? If I seal this slab up now, I’m I going to curse that decision later?
Thanks!
Jon
Replies
That product is an excellent concrete sealer. I use it all the time. Forget using it if you want to tile over it, because nothing sticks to it, especially if you have two coats on the concrete.
The only way you can safely tile over it is to grind it down somehow before tiling. I have also done this many times when necessary.
Depending on the size of the area, grinding the surface may not be that big a deal if you think you really need to seal it.
That means scarifying the surface to get a good bond with your next coat of whatever.
By the time it weathers another year, and you walk it and haul materials across it, and drop tools and nails on it...
You might still need to hit it with a grinder, but not too hard
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