Roof tear-off versus overlay is an important decision during installation; removing old shingles allows for better

http://rylanjmic074.theglensecret.com/how-to-select-the-right-roofing-material-for-your-flat-roof-1

Roof tear-off versus overlay is an important decision during installation; removing old shingles allows for better inspection of underlying structures while overlays can save time but may not address existing problems effectively