To be clear, tipping is neither mandatory nor expected in the construction industry. But if your roofer has done something above and beyond, there are plenty of ways to show your appreciation.

First and foremost, don't sign anything and don't pay any contractors up front for roof repairs after a storm. If you think your roof has damage, your first phone call should be to your insurance agent to make a home insurance claim for roof damage. Your insurer will send out an adjuster who can inspect the damage.