Moisture test numbers are the only thing that matter in my book, and half the guys arguing about glue-down never even run one. I have seen floating floors buckle in a 40,000 square foot big box store because nobody checked the slab before the crew showed up. Glue-down does not fix a bad slab either, it just hides the problem until the adhesive lets go. Both methods work when the prep is done right, so the real fight is about who wants to eat the cost of fixing the concrete first.

That "we thought you were okay waiting" line would've set me off. What part of sending an invoice says "pay me whenever you feel like it"? Did they actually have the cash on hand, or did your showing up force them to scramble and write a check they weren't ready to cut? Three weeks is already pushing it, but the fact they tried to flip it back on you like you were the one being unreasonable is a huge red flag. That tells me they planned to drag it out even longer until someone made them uncomfortable. So what happens next time, are you adding late fees to your invoices now or just blocking anyone who pulls this again?