Home Depot is ending its roof installation business, according to several news outlets. The Street first reported the move that not only affects the company's roofing installation business, but also gutter, insulation, and siding. Home Depot will continue to sell roofing, gutter, insulation, and siding products.

A licensed general contractor (any class) is always required. In some cases, an owner may act as general contractor. An Illinois-licensed roofing contractor is required as either the general contractor or a subcontractor.

However, a license isn't mandatory for roofing contractors in Texas. The only exception is a person or company considered a specialty contractor. For example, a contractor who does electrical work, masonry, HVAC, carpentry, or paving on a roof needs a license.

The most common types of roofing materials should be replaced every 15 to 20 years. If your house has a metal roof, this should be replaced every 50 years or so.