Patio regrouting
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Woodbridge Environmental Tiptophouse.com on May 17, 2014How wide are the spaces between the patio slabs? Normally this method of grouting is reserved for small spaces normally found between paving bricks. The cement grout that is used is designed to flex a little with the pavers as they are always moving. With larger cement slabs the correct fix is to use a backer rod, which is a foam wire shaped product that is placed about a half inch below the surface of the top of the cement and a urethane caulk is applied that flows out and sticks to each side of the slab. Its design is that as the patio moves the seal will flex with it. Cement and sand mix is both soft and easily crumbles which is what your seeing. Not the right product to use. The polymer in the mix makes it able to flex somewhat, but it cannot be to wide of a gap or it will fail as you now understand.Helpful Reply
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Leslie Long on May 19, 2014A picture would help if you could upload one. I would ask the same ? as Woodbridge - how wide are your joints? I have used and sell polymer sand at Home Depot and he is correct, it is mainly used for very small spaces, I would say 1/8" or less....maybe 1/4". Good luck :)Helpful Reply
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