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Crystalline VS. Polyurethane Waterproofing

Crystalline VS. Polyurethane Waterproofing

Crystalline VS. Polyurethane Waterproofing

(OP)
Crystalline is so known for doing a great job waterproofing pipes, tanks and swimming pool walls if you don't want to drain the pool. However, it can't take much movement since it's so rigid.
We know that Polyurethane injection doesn't have this problem and on the other hand, it can penetrate deep into cracks. What's the downside of Polyurethane injection that make people use crystalline waterproofing for the same scope of work?

RE: Crystalline VS. Polyurethane Waterproofing

As long as the crack is not active and not too wide, crystalline material works well.

Dik

RE: Crystalline VS. Polyurethane Waterproofing

(OP)
So, when is Polyurethane injection preferable?

RE: Crystalline VS. Polyurethane Waterproofing

Definitely if you have a 'wider' crack that is moving. It will move with the crack, bond to the surfaces of the crack and afford movement.

Dik

RE: Crystalline VS. Polyurethane Waterproofing

(OP)
Thank you very much dik. I appreciate it

RE: Crystalline VS. Polyurethane Waterproofing

Glad to help... That's what this site is for...

Dik

RE: Crystalline VS. Polyurethane Waterproofing

To add to dik's excellent (as always!) comments, crystalline treatments are essentially pore fillers that fill and seal natural pores in concrete. Polyurethane and other types of injectable sealants are not pore fillers....they are crack fillers. They usually allow some movement within the crack through their extensibility or flexibility. Crystalline pore fillers have little or no extensibility and flexibility...that's not their purpose. You can used both, just use the injectable sealants first, then the pore filler.

RE: Crystalline VS. Polyurethane Waterproofing

Ron:
Now my hardhat doesn't fit...

Dik

RE: Crystalline VS. Polyurethane Waterproofing

(OP)
Thank you Ron for the useful information. Glad to be in such a nice environment at this Forums

RE: Crystalline VS. Polyurethane Waterproofing

dik...you and I are from the same era.....our heads are hard enough not to need hardhats! lol

RE: Crystalline VS. Polyurethane Waterproofing

In route to making a selection as to the best material for sealing a crack, it should be understood that while you can subsequently inject urethane into cracks that were previously repaired/injected with epoxy; cracks injected with urethane cannot be subsequently injected with epoxy.

RE: Crystalline VS. Polyurethane Waterproofing

epoxybot touches on a couple of issues... prior to undertaking a repair, the cause of the cracking should be determined... in addition to epoxies not being used with polyurethanes... most polyurethanes can bond to other polyurethanes chemically... many epoxies cannot accept an epoxy bonding...

Dik

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