Repair concrete expansion joint


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Old 10-14-14, 10:05 AM
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Repair concrete expansion joint

concrete driveway has expansion joint where it meets garage floor. Expansion joint needs to be replaced. Do I use the type of fibre expansion joint or is there a better way?
 
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Old 10-15-14, 04:55 AM
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better way - remove exp jnt, install closed-cell backer rod, then seal per directions on sealant tube,,, we use either 100% silicone OR NP 1 ( more color options ) but all you'll find @ apron/vest stores is gray,,, sealant should NOT come in contact w/tires !
 
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Old 10-15-14, 05:14 AM
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Thanks!

When I remove the old expansion joint, should the empty space be filled with something before I install the backer rod?
 
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Old 10-15-14, 05:17 AM
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It depends on how deep the void is, often the backer rod and caulk is all you need. You could pour sand in and then insert the backer rod.
 
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Old 10-15-14, 05:23 AM
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OK, I was thinking using sand. I will do it today.

Thanks!
 
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Old 10-16-14, 09:36 AM
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i wouldn't especially where there's movement of conc either from freeze/thaw or HOT temps during the day & cool 2 nite,,, conc changes dimension in response to temps,,, sand may be forced upward by expanding conc thereby risking sealant's adhesion - not a good thing - we'd leave empty space instead but its your house,,, IF you absolutely positively have to fill that space, use vermiculite
 
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Old 10-16-14, 11:16 AM
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Thanks for the info. I decided that sand wasn't a good idea so I am leaving it empty.
 
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Old 10-18-14, 04:11 AM
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good man ! ( this is just ' filler ' as the original congratulatory phrase was too short to suit forum rqmts ) [ now twiddling thumbs awaiting for this insane ' time rqd to repost ' is up ]

btw, sand is NOT a compressible - that's why its unacceptable !
 
 

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