So my first row was a bear to put on. I initially put a string up and did a chalk line at 48 inches, but when I go to put my first board up the board is over top of the line. I decided to try and make sure the first board is straight as possible, then I put in temp screws in to hold in place. I bring up the next osb and line it up and temp put in place. I do the same for the 3rd all look good. I found out that for some reason the trusses are not perfectly square and this is the main reason for some of my issues. For example one truss would measure 24″, another, 23 3/4″ another 24 1/2. These are at the ends of the first of the trusses put up. So, I’m thinking I will just cut off the end of the truss to make 90* cut when done. So now I get to the end and I’m looking at the last osb sheet put up on the gable end and it appears to be 1/2″ off from top to bottom.
My question is if this is truly off (could be a warped board too, I’ve had lots of them here lately) how can I correct the next row so it doesn’t magnify onto the other rows?