Steel Over Asphalt May Be Allowed
In many areas, building code requires that there be no more than two layers of roofing on a home. If there are more than that, everything must be torn off when a new roof is installed. If you already have two layers of roofing, you may not be allowed to install a metal roof over your existing asphalt – even though there are advantages and even though metal roofing weighs less than asphalt.
Keep in mind that code varies from one municipality to another and is different out in the country too. Check with us or with the building department in your city to understand your options.
Not All Steel Roofs Are The Same
You need to make the right steel roofing choice because a well-installed metal roof can last 50 years or more. That’s twice as long as most asphalt roofs.
When installing steel over asphalt, metal shingles may be a better choice than traditional standing seam metal roofing. That’s because steel shingle systems are installed over a framework that increases their strength and allows them to withstand winds of nearly 120 miles per hour. This framework also creates a straight, flat surface for the new roof even when the old asphalt shingles are curled or the roof ridge shows some bowing.
Additionally, the frame allows for a ventilation gap that can prevent problems with icing in the winter. If you choose a standing seam steel roof to put over your asphalt roof, the results may not be perfect.
Other Considerations Of Metal Over Asphalt
When a steel roof is installed without an asphalt layer underneath, you may find the roofing noisy. The old asphalt shingles serve as padding to dampen and muffle sounds from wind, rain and hail.
While a steel roof is more expensive than asphalt shingles, you get many benefits in durability, beauty and longevity. And you may find that steel roofing materials and installation are more affordable than you think. You also may find that some modern products are installed over a system that provides the same ventilation advantages of installing the system over asphalt.
To learn more about your options and which solutions are best for you, contact us. We’ll help you make a sensible decision.