Quote:
I thought something was wrong when the installer arrived and started asking me for allen wrenches to remove his saw blade which appeared dull...
Blades do get dull and need to be changed, I see nothing wrong with changing them on the job. It's either that, or use a dull blade! Losing or forgetting your allen wrench and asking to use a customer's is questionable, but in my opinion, preferrable to using a dull blade to "save face".
Did the get the blade changed or not? If he changed it, a dull blade wasn't the problem. And even if he didn't change it, a dull blade on the chop saw would only muck up the ends of the boards being cut, which only happens at the end of a row, where it gets covered by molding. Someone else asked but I didn't see an answer - the damaged ends you mention - are they in the field of the floor or on the ends? There's no reason he should have been cutting boards in the middle of the floor, but the ends can be damaged by knocking them wrong with the hammer.
It's not uncommon for boards to come out of the box boogered up on the ends. We also frequently run into boards where the stain didn't quite make it all the way to the end of the board so there's a slight but noticable discoloration on the end. These kinds of boards shouldn't be installed, or you cut them and make use of one end or the other.
The damaged edges (longwise) can be from being smacked with the hammer the wrong way, and also from a gun in need of repair. A good installer should not be boogering up boards as they're installed, but even the best of us get a little slap-happy once in a while and booger a board, in which case you kick yourself and take it out.
Quote:
I have also found some boards with splits down the center of boards, some as long as 6-7 inches.
Those are bad boards that shouldn't have been installed. Or the wood was dry and they split on impact, in which case they should have come out.
It sounds to me like you got a combination of a sloppy installer and some bad wood, both from a store that sounds very suspect.