good evening , i am building a new house and my carpenter glued and nailed the subfloor , i am wondering is it ok to go back and screw it . thanks in advance
It is already glued and nailed. That will be enough to hold it. My floors were nailed down 25 years back - and they have not moved and if I need to lift a board those nails are a real pain to remove. Yes, use screws when it is first installed in placed of nails but not as well.