Shingles and felt paper were torn off as this is necessary to make way for a Clean Deck Install. High End Synthetic Felt, Tiger Paw, was installed as the underlayment along with a leak barrier, Storm Guard, around all the roof penetrations (pipes, skylights, chimneys, vents).
Re-roof Construction in Frisco, TX
This video shows the whole two day construction process, from removing the old shingles all the way down to the deck to adding ice and water shield, synthetic felt paper, etc. and eventually the new shingle.