If you are going to get your roof installed or replaced then you must think about how you can get a better roof within a reasonable budget. You can hire certified professionals for roofing services whether you need it for your home or for your commercial property.
Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement. No serious private advertisers ask for a down payment before you meet. Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.