Spud1975

Hi , I am currently having a patio laid. The contractor has laid the slate but after drying over the weekend ,4 days, all the tiles are loose and can be lifted by hand. I sent the contractor a couple of pics and raised my concern. He advises the grout will hold it in place. He is currently away and has not seen the actual issue first hand yet. My basic DIY knowledge is that the grout is cosmetic and the cement should hold the tiles in place. Type 1 mot was laid and compacted, then slabs laid on sand cement mix. I feel the job has many of the correct elements but something has been missed I would like a professional opinion before the contractor returns to site in a couple of days so I am in a position to understand my options and discuss with him. If the job is substandard what are possible causes and what would be the best course of action to get the job back on track. Any comments advise would be greatly appreciated. VID-20220507-WA0000.mp4