Bad Roofers Will Rob You and Leave Your Roof Like This . Hiring the wrong roofer can do a lot of harm and be a complete waste of your money. One of the tricks a lot of roofers use after it rains is to offer a tarp to cover your roof and save you money by reducing the damage that is caused by upcoming rain if you can`t get your roof fixed in time. It is not a bad idea to get your roof covered to prevent additional rain damage while waiting to get your roof fixed but it needs to be done properly and I usually see it not being done right and the result is a complete waste of money.