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*The Angi rating for Roofing companies in Union, MI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Roofing needs.

*The HomeAdvisor rating for Roofing companies in Union, MI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Roofing needs.

Last update on March 25, 2026

Roofing questions, answered by experts

The principal, common, and auxiliary rafters are the most frequently used types of rafters. Principal rafters are large and typically appear toward the edges of the roof. Common rafters are smaller than principal rafters. Some people may use a mix of common and principal rafters. The auxiliary rafter is not common, but it provides extra reinforcement for a principal rafter on a large building.

While a few icicles on your roof are standard, a large accumulation can be a sign of a bigger problem, such as poor insulation. This is particularly true if you are also dealing with ice dams. If you have numerous large icicles, it is recommended to have a roofing contractor diagnose potential insulation issues and create a plan to solve them.

You can think of a flat roof as a green roof, as it does offer some environmentally-friendly advantages. When considering an eco-friendly flat roof, some of the green roof pros and cons include that you could place a garden with plants on the flat roof. Manufacturers may use recycled materials in the construction of the flat roof for an eco-friendly design.

A roof replacement can take anywhere from one to 14 days. For most homes, a full replacement that includes tearing off old materials takes about one to two days, though the average project can last up to 12 days. The exact timeline depends on several factors, including the roof's size and complexity, the type of roofing material, the crew size, and weather conditions. Certain materials take longer to install; for example, metal roofs can take seven to 14 days because the material is more difficult to work with than asphalt shingles, wood, or tile. A re-roofing project, where new shingles are installed over old ones, can take half the time or less. It's also important to factor in the time needed to obtain necessary permits. A professional roofing contractor will typically complete the job faster than a DIY approach.

Properly maintained roof decking can last between 20 and 30 years on average, though it varies based on a few factors. Mainly, the quality of roof decking materials and environmental conditions have the most impact on longevity. You can extend its lifespan by regularly inspecting your roof and making repairs as necessary.