Post-Installed waterstop

[WARose]

I have this box that needs to be water tight.....and it doesn't have waterstop cast in the joint. Is there a post-installed waterstop I can use to fill up those corners and tolerate a bit of movement? Seems like Sika made some stuff at one point (sort of like a tape).....but I can't find it.

 

[SlideRuleEra]

For structures either below the water table or for water-containment we used bentonite based waterstop instead of cast-in-place PVC.

http://www.SlideRuleEra.net

 

[WARose]

I may be reading this wrong but this does not appear to be a post-installation applied option.

 

[SlideRuleEra]

I must have misunderstood your question, sorry. This waterstop is placed after the first concrete pour has been completed, but before the second.

http://www.SlideRuleEra.net

 

[bones206]

There are other types of strip waterstops that are non-swelling in case you can't meet the minimum side cover for the bentonite type. My company had a project where an entire edge of a slab blew out at the top when the waterstop expanded. They were using a bentonite waterstop installed at mid-depth of the slab. I would want a generous side cover on each side of the WS along with rebar dowels on each face to help restrain the expansion pressure. Sika Hydrotite and Kryton Krytonite are other types of swelling waterstops.

The non-swelling strip type waterstops I know of are Henry Synko-Flex and Sika Lockstop. For a post-installed PVC waterstop, look for "Retrofit waterstops". Sika and others make them.

I was on the same page as SRE, so I may have misunderstood your situation as well.

 

[bones206]

If the entire box is already constructed, I think you are limited to a surface applied membrane or sealer of some sort.

 

[WARose]

If the entire box is already constructed, I think you are limited to a surface applied membrane or sealer of some sort.

That's what I am after.

 

[bones206]

Kryton Krystol is surface applied, and basically fills up the pore space in the concrete with a crystalline structure. I haven't tried using it in practice, but my understanding is the movement and crack width tolerance is low. Until convinced otherwise, I keep that stuff in the too-good-to-be-true category.

There are tons of membranes available, with several variations catering to specific design scenarios. I've had good luck with Cetco and Sika products, but always consult with one of their reps to make sure I'm spec'ing out the right product for the job. There are spray-on membranes/liners as well. Just a lot of possibilities and variations out there, with no real one-size-fits all product.