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Grass Growing in Cracks in Concrete

We have a concrete floor in our garden, some of it is a foundation of a previous building and quite deep. There are several cracks in the concrete where there is grass and weeds growing.

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We want to put tiles on the whole floor, however we are not sure how to stop the grass and weed growth in the concrete for good. We want to be sure that the grass don't grow in cracks once we have tiles layered on top of concrete and eventually cracking the tiles too.

We are not sure using weed killer in the cracks will stop weeds growing in the future. How about laying a membrane on top of concrete and then putting another layer of concrete and then tiles, will that stop grass growing in the cracks ?

A third suggestion was putting glue in the cracks, will that stop grass growing through cracks? We tried filling the cracks with some cement mixture, but the grass still grew through minor cracks. Any suggestion will be very much appreciated. Thanks in advance.

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Hardiness Zone: 10b

By s1d from London

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May 26, 20090 found this helpful

You may need to try several things to get the job done. Spray or pour on straight vinegar, let that do its job. Then use something pointy, like a small hand garden trowel, to dig into the cracks and pull out that dirt and dried grasses. Then fill in with sand bought from walmart, or home supply store. Tamp down really hard. My husband has used this method, and then filled it in with that expanding spray foam sealer, then when it was dry, cut it off even with the surface of the concrete before putting down whatever you want to lay over.

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