Caulk coming out of driveway expansion joints


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Old 08-03-09, 09:39 AM
J
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Caulk coming out of driveway expansion joints

Hi, I have a 10-year-old home that I moved into 18 months ago. The previous owners put some type of caulking in the driveway expansion joints. A lot of it has worked its way out. I'm wondering if I should remove the rest and then recaulk or just leave it be. I haven't seen many driveways with anything in the expansion joints, so I don't know how necessary it is. Thanks for any advice!

See image below:

 
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Old 08-03-09, 04:57 PM
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The advice I would offer is that if you DO decide to caulk your joints, you will want to get them really clean. The grey elastomeric sealant won't stick to dirt, or dirty cement. You would want to dig out any loose caulk, and clean the joint out as deep as you can. The best joint is created by first inserting foam backer rod (available in many sizes for various sizes of gaps) about 1/2" below the surface of the cement. This allows you to fill the joint with sealant which will stick to the cement on both sides. The foam backer rod flexes as the joint moves.

And unless the driveway (the caulk joint, actually) is PERFECTLY level, don't use a self leveling sealant, or it will all slowly run toward the lowest point.
 
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Old 08-03-09, 05:33 PM
J
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Thanks much for the advice!

Any thoughts on why the seal failed? I'm guessing because the joint wasn't prepared as you describe--there's no backer rod from what I can tell.

Can anybody offer and opinion on whether or not this is a useful thing to do for my driveway?
 
 

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