OK getting ready to do a garage slab the HO did the prep work all I and my crew is going to do is pour scree float and finish the slab cut expansion joints in you know the back breaking work. went out to the job site he has down 6 mil poly layered to about 18 mil thick he used the whole roll of 20'x100' for a 620 sqf garage. Normally I just put down one single sheet over lap the seams by a few feet tape the seams call it good. this guy I think did over kill but I don't think any harm was done. unless Some one knows better then me. I just think he won't have a problem. So was it a waste of poly or did he do good?
1 thing that probably WON'T happen is tearing the 6mil usually it gets punctured just from walking on it & pushing/shoving aggregate,,, for garage floors, we lay 1 & that's it,,, commercial & residential interior floors get stego,,, taping seams is fine for both
trust a h/o to always err on the side of o'kill especially when they're tried to learn off the i-net - good luck - he MAY want to supervise