5 Best Of Can You Put New Roofing Felt Over Old Felt HD Image Size. Jan 24 2014 The answer is yes you can lay new roof shingles over old ones. Remove if tearing off old roof.
Sep 16 2014 Why Installing New Shingles Over Old Shingles Can Be Good. Just like they said if its a re-roofyou do not need felt paper if you are not tearing the roof off you need drip edge and shingles and depending on how good of a roofer you are and what kind of job you do all the other little stuff like flashingnew pipe flangescaulketcBut if you are tearing the old roof off than you must have felt and yes we take all the old tar paper off till you see nothing but plywood how else can you see if. 3rd valley flashing would have to be full of nail holes as well.
Old felt is part of the old roof.
So the answer is no you cannot. 3rd valley flashing would have to be full of nail holes as well. Yes its okay I supposebut make sure all previous nails and staples are removed or pounded down to prevent tears when your rolling out the new felt. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level.