I have a rental house with a few of sluggish roof board in certain part of attached garage. An agreement of replacement was made before replacing roof. Steven, the owner, said that he will charge $50 per piece with the first 2 pieces free of charge. When he and his guys worked on roof, they first tried to cover the sluggish part of roof without replacement of any roofboard. After I requested them to change it, they then cut a small part ( 30%) from the whole roof boards to put on roof and throwd the big part (60%-70%) down to their junk bin. 5 big pieces were rescued from their bin after I found it, but they argued that it's left-over. They charged me for those pieces that they wasted intentionally. The new roof they laid on was leaking soon when it first rained in days after they finished roof. Squirrels entered beneath roof because the roofer hadn't got the roof board edge sealed properly. I contacted him but never got his response.