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Will a metal roof cause mold?

Metal Roofing Can Be Installed Over Existing Roofs A potential problem with this type of installation is trapped water vapor. If trapped between the metal roofing and old roofing, moisture can build up and cause mold and rot.

thespruce.com - 12 Things to Know About Metal Roofing - The Spruce

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Metal roofing has entered the mainstream and is a viable option for nearly all homes, except those with very flat roof pitches. Not all metal roofs scream "metal." There are now shingle-style metal roofing products that are almost indistinguishable from traditional asphalt shingle roofs. If you are wondering about the merits of metal roofing, here are 12 things to know.

Metal Roofs Are Not Just a Novelty

Once, metal roofing was found only on high-end, architect-designed homes. That's no longer true. Metal roofing is found in conventional houses, thanks to increasing availability and improved manufacturing processes. According to industry statistics published in 2017, market share for metal roofing increased at a rate of roughly three percent each year for a few years and about 15 percent of all roofing installations used metal roofing materials. At the same time, the market share for asphalt shingle roofing fell, and accounted for about 59 percent of the total roofing installed.

2:00 Everything You Need to Know About Metal Roofing

Metal Roofing Can Be Installed Over Existing Roofs

Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. While shingle removal is the preferred route, tear-off is messy and raises the cost of the job. A potential problem with this type of installation is trapped water vapor. If trapped between the metal roofing and old roofing, moisture can build up and cause mold and rot. But roofers can install a vented metal roof that eliminates this potential problem. Or, installing the new metal roofing over furring strips (1 x 3s or similar) will raise the metal and provide a ventilating air pocket between layers. Make sure to consult local building codes before having a metal roof installed directly over old shingles. Some jurisdictions may require full tear-off whenever a new roof is installed.

Metal Roofs Are No Noisier Than Asphalt Roofing

Although it's a common misconception that metal roofs are noisy when rain or hail falls on them, the reality is that when properly installed, metal roofing is no noisier than any other type. Metal roofing is typically installed over a solid substrate. Additionally, the attic and insulation provide a sound barrier. From interior living spaces, inhabitants rarely notice any increase in sound levels when a metal roof is installed.

Metal Roofing Does Not Attract Lightning

You might think that a metal roof will attract lightning, but this is not borne out by facts or statistics. According to a technical bulletin from the Metal Construction Association, "Metal roofing does not in any way increase the risk of a lightning strike." Not only that but also if metal roofing does happen to get struck by lightning, it is less combustible than conventional roofing materials such as wood shakes or shingles. As the bulletin asserts, "Because metal roofing is both an electrical conductor and a noncombustible material, the risks associated with its use and behavior during a lightning event make it the most desirable construction available."

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The reason that metal roofs do not attract lighting is simple: lighting seeks a path to ground, which is why trees, telephone poles, and other such structures tend to attract lightning. Metal roofs are isolated structural components, with no direct path to ground inherent in their design. Hence, there is no scientific reason for lighting to strike a metal roof any more often than it strikes an asphalt shingle roof.

Metal Roofing Can Be More Cost-Effective

Although most metal roofing products carry warranties comparable to the very best asphalt shingles (about 30 years), in practice, metal roofs have been known to last 50 years or more. According to State Farm Insurance statistics, metal roofs routinely have a longevity of 40 to 70 years. It is therefore very rare for a homeowner to install more than one metal roof over the time he or she lives in the home. By contrast, a homeowner will likely replace an asphalt shingle roof two or even three or four times over a 50-year period. Overall, while the cost of a metal roof is more expensive than asphalt roofing (about double), it can save money over a long period. Tip Many insurance companies may also offer reduced rates to homeowners with metal roofs, particularly in wildfire or hail prone areas, further reducing overall costs.

Metal Roofing Is Impervious to Fire, Rot, and Insect Damage

One of the principal reasons metal roofing has exploded in popularity is that it is virtually fireproof. With the dangers of wildfire on the rise, metal roofing has become the roofing material of choice in many parts of the country. And not only that:

Insects such as termites can never eat metal roofing.

Metal roofing is impervious to rot and mildew.

Since it conducts heat quickly from the sun, snow slides off more quickly than with conventional roofing.

Metal Roofs Are More Energy-Efficient

Industry studies show that metal roofs reflect solar radiant heat, which can reduce cooling costs by 10 to 25 percent. In climates where cooling costs are higher than heating costs, coating a metal roof with a shiny or granular coating can maximize the reflective capacity of the roof and improve energy savings.

Metal Roofing Can Work on Roofs With Low Slopes

It's often believed that metal roofing is suitable only for roofs with a steep slope, but standing-seam metal roofing can work fine on gently pitched roofs. This type of roofing is installed in large sheets with seams that are raised and sealed tightly together to resist water. While some slope is necessary to ensure water run-off, most homes can accept metal roofing.

Severe Hail Can Ruin Metal Roofing

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Although metal roofs are considerably more durable and maintenance-free than asphalt shingles and other forms of roofing, they are not indestructible. There is one weather condition in particular that bodes ill for metal roofing: large hail. Aluminum and copper, in particular, can be susceptible to denting when hailstones approach golf-ball size. Steel is harder and fares better in hailstorms, but if you live in a region where such catastrophic hail can occur, be aware of this when considering metal. Pea-sized or even dime-sized hail is rarely a problem, but hailstones larger than this have been known to ruin metal roofs. Then again, large hail can also destroy an asphalt shingle roof, so if you make sure to have good homeowner's insurance that covers such storm damage, there is no reason not to install metal roofing.

Installation and Repair Usually Requires a Professional

DIYers have been known to install and repair metal roofing, but it is generally not advised. Metal roofing is generally available only through select retailers, and the techniques for installation and repair are specialized skills. If you opt for metal roofing, you will likely be calling a specialist should problems occur. Fortunately, such problems are rare with metal roofs.

Ridge Vents Are More Obvious

On most homes today, attic venting is provided by a continuous ridge vent that runs across the peak of the roof. On a shingled roof, this continuous ridge vent (CRV) is a strip of shingle-like material that runs the entire length of the peak of the house, masking outflow holes on the sides of the ridge. You likely have seen this countless times, but probably never really noticed because the CRV usually lies very flat and blends in perfectly with the surrounding roof. On many metal roofs, especially standing-seam roofs, the CRV is also metal, and it stands out further and is thus much more noticeable. These thick, prominent lines or ridges are inherent in metal roofs and add to their distinctive look.

Metal Roofs Are Recyclable

Although metal roofs are very long-lasting, when the time comes to replace one, the old metal is readily accepted at metal recycling outlets. Old asphalt roofing, on the other hand, is usually destined to take up space at a landfill.

thespruce.com - 12 Things to Know About Metal Roofing - The Spruce

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