Asked a Check-a-Trade registered Joiner to replace floorboards (some creaking and broken) in my hallway. He arrived and installed chipboard (9mm) on top of the floorboards I wished to be replaced. When I questioned such, he stated "That's what we always do. Put down chipboard and use plenty of nails". Is that correct? Seems strange to me. Why not use screws if chipboard is utilised? Central heating pipes, should they need to be accessed, are now under two layers of boarding. The creaking has not stopped. As it was Check-a-Trade, I paid him, although I now regret such. Will have another Joiner examine the work. Not pleased, as am a cardiac patient with a limited income and don't need the stress.