Here are few tips to avoid getting ripped off:
1. If they come to you - knocking on your door - don't use them. Trustworthy roofers are busy after a storm. They don’t have time to solicit business door to door. They’re too busy with work that was referred by satisfied customers. Often these so called "gypsy roofers" will show up at your door posing as a legitimate roofing company. They'll offer an estimate and ask you for a deposit. You'll never see them or your money again.
Texas has one of the highest rates of fraud in the roofing repair industry. It is mostly due to a lack of state regulation over roofing contractors. They are not required to be licensed like plumbers and electricians and this allows gypsy, drive-by and storm-chaser roofers. They know full well that insurance adjusters are following close behind after a big storm.