Appreciation post: My Milwaukee angle grinder taught me a hard lesson about underlayment
I was finishing a laminate job in a 900 square foot apartment last month, and the floor felt springy in one corner. I kept going, thinking it was just the old subfloor. The next day, the homeowner called me back because a seam had popped up. I pulled up a few planks and saw I'd missed a quarter inch dip in the plywood underlayment. I had been so focused on the click system I forgot the first rule: a flat floor is everything. How do you guys check for subfloor flatness on the fly without a 6 foot level?