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We are finishing our basement and had a new concrete slab poured. However, in one area, the floor dropped about an inch over 4 linear feet. Self-leveling concrete was poured, but there is a ridge where the new concrete ends. I’m concerned that the flooring will be uneven or have soft spots, which is the reason we demolished the existing slab and poured a new one. Should they first somehow sand or otherwise smooth the concrete ridges down to the floor level before applying the vinyl floor boards? I will definitely ask when they resume next week but imagine this is fairly common and am curious to know if there is a standard practice about which they may not be aware. Any thoughts are welcome! Thank you
 

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Naildriver
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Yes, any ridges or other aberrations need to be addressed prior to installation of flooring.
 

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Super Moderator
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A concrete grinding wheel will take off the raised edge, but will be dusty.
 
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