just been to look at a job where the builder had bought some sandstone 3 inch thick,8 inch tall and 40 inch long. They were still damp and he asked me to stick them above a ground floor window as a feature. The wall was painted render and it was raining as well. He said just knock some rapid set up stick them on and I will get the joiner to prop them up for a bit I could hardly hold them above my head and when I refused to fit them he asked me to leave some rapid set and he will sort it. Anyone know if there's a weight limit for adhesive or a shear strength. I told him they needed chopping in and mechanically fixing but he wouldn't listen.