Recognize that the service you receive during your first interaction with a company often gives an indication of what to expect in the future; For example, if your call is not returned for days, imagine what you would experience when you called for warranty service.
Consider the quality of the company's an advertising and website; If you're not impressed, chances are you won't be impressed by the quality of the work they're proposing to do.
Evaluate the quality of the sales presentation and attached forms. If the forms lack details, you are relying on verbal promises, which will likely be rejected. You can also hire one of the best waterproofing firms via various online sources.
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Educate yourself. The Internet is a powerful learning tool, and as you've probably heard, "the devil is in the details." Yes, you'll read different opinions on best practices, but at the very least, be prepared to weed out fraudsters who are trying to sell you their services.
Ask questions. Ask the contractor to tell you what he will do, why his products are the best, and why his technicians are the best. After all, the people doing the work are extremely important. If they are not trained, complacent in the execution of their job, or even dishonest, you will have a nightmare on your hands.
Refuse to hire a contractor who does not specialize in foundation waterproofing. Without the necessary experience, no one can know the best products and/or practices for this type of job. There are other considerations and factors to consider in hiring a contractor, but at the end of the day, if you apply your logic and trust his instincts, his decision is likely to be the right one.