Ask Alliant Roofing Company’s owner Jeff Sitton about what makes a quality commercial roofing system, and he starts with a history lesson. Let us step back a few years. Fifty years ago, everything was hot mop (built-up roof), where heated asphalt was in a kettle on the ground. It had to be pumped up to the roof, where roofers then applied it over felt materials. The felt served to separate the deck from the roof’s exterior…