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Stavop 06-28-2008 08:20 PM

concrete expansion joint sealer
My old school fiber concrete expansion joints have dried up and withered away and I want to fill it with that flexible caulking. I have already bought the foam backer rod and stuffed it into the crack after removing the debris but I'm having trouble locating the stuff. It really gets me too because I was just at Target and seen it used just outside their door.

Any of you folks know what I'm looking for?

This site is very cool, many smart people:)

AtlanticWBConst. 06-28-2008 08:30 PM

You are looking for either a Sika Flex caulk or a BASF NP1 style caulk. They are Polyurethane caulking. Try a motar/brick/stone supply house.

Stavop 06-28-2008 08:41 PM

Thank you. This site has been one of the best discoveries I've had.

yesitsconcrete 06-29-2008 06:01 AM

we like polysulfide as its gas/diesel resistant,,, 100% silicone works well, too,,, have done miles of highways w/it.

handyz 07-20-2010 06:23 PM

I've found that Dow Corning has a good pavement sealant for expansion joints. It's good for handling weather extremes and I found it really easy to install.

stadry 07-21-2010 08:09 AM

dow's product's good however won't resist gas/petroleum,,, normally its only used on runways & highways.

R&D guy 07-27-2010 02:13 PM

There's a new method available that will be a whole lot less work than the polyU caulk. Works for residential-type applications with rounded edge slabs and 3/4" joints.
these guys are new, and you can't get it too easily just yet, but it looks sweet.

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