To answer your last question first, yes you might need an attorney. A REAL ESTATE attorney.
Did the Seller provide you a Texas Seller Disclosure? If so, this would have indicated information they had on the roof, foundation and more. Did you perform inspections by a Texas licensed inspector? Maybe the inspector missed a few items? Did you have a Realtor representing you? They might have more information.
As far as I know, there are no "Lemon Laws" specific for real estate. You can always go after another party in a court of law, but it might be simpler to go to mediation first to resolve any issues you might have. There will be MANY flipped homes after Hurricane Harvey in Houston in 2018 and beyond. Buyer-be-ware and do your due diligence including hiring a Realtor and performing inspections.