Frequently Asked Metal Roofing Questions

Whether it’s a residential or commercial construction project there are many advantages with going with a metal roof. A metal roof provides an aesthetic appeal over the traditional shingles and allows for more color choices. The roofing is much easier to install and is much more reliable. The energy savings from having a metal roof are also sensational. Throughout our years of services a few common questions have come up about metal roofs. To answer some of these questions beforehand here is a list of metal roofing FAQs.

How can a Metal Roof save energy?

Many conventional roofing materials, asphalt shingles, for example, absorb energy from the sun. Metal, on the other hand, reflects most of the sun’s rays. At day’s end, metal also cools more quickly. As a result, the attic space remains cooler, as does the living space below. Conventional roofing materials tend to absorb and retain heat, therefore requiring more energy to maintain a cooler living space.

Can I install a Metal Roof over my existing roof?

Yes, it is possible to install a metal roof over an existing roof. Metal is light weight which makes it easy to work with. Since metal roofs also comes in sheets premade in many different sizes it is also very economical.

Will it look good?

N.A.R recognizes that appearance is a major factor in the choice of roofing material. To ensure that the benefits of metal go beyond longevity and durability, N.A.R’s highly diversified line of roofing products offers the homeowner a wide variety of styles, colors, and finishes.

Will it make noise when it rains?

No, the metal roofing will not make noise when it rains due to the fact that it is often installed over plywood decking and felt or an existing roof. The noise you will hear will be the same as what you would expect from a conventional roof.

Will it cost more than conventional roofing?

No, the initial investment will be higher but the extra costs leading to the replacement of traditional shingle roof will lead to a lower overall investment cost. Having a metal roof provides the owner with low maintenance work.

What is Solar Reflectance Index (SRI)?

The Solar Reflectance Index is a measure of the constructed surface’s ability to reflect solar heat, as shown by a small temperature rise. It is defined so that a standard black (reflectance 0.05, emittance 0.09) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100. SRI combines reflectance and emittance into one number.

What is Solar Reflectivity (SR)?

Reflectivity is the deflection of solar energy from a surface. Steep slope roofs have proven to perform better than low slope roofs, 2:12 or less. The greater the amount of solar energy reflected from a surface, the less energy will be required to keep it cool.

What is Emissivity?

Emissivity is the amount of heat that is radiated from a surface. The greater the emissivity, the greater the ability of a surface to cool itself through radiative heat loss, which ultimately reduces energy consumption.

How do you measure the actual (aged) emissivity and reflectivity?

There are standard ASTM procedures for measuring both these properties. These procedures include ASTM C1371 and E408 for emissivity and ASTM E903 and E1918 for reflectivity. The Energy Star program specifically requires aged reflectivity values tested after 3 years.

How can NAR help achieve LEED points?

MBCI can help in several areas. First, 100% of a metal roof can be recycled. In addition, the composition of our metal roofs is about 25%-35% recycled material. Points are awarded for this benefit. Secondly, MBCI has 16 manufacturing facilities throughout the U.S. creating greater opportunity for delivery within a 500 mile radius. Lastly, our reflectivity and emissivity performance levels meet LEED criteria for cool roofs.

Can a Retrofit roof work with Energy Star and LEED requirements?

Yes. Leaky flat non-metallic roofs can be replaced with sloped metal roofs by adding an engineered light weight secondary structural system to the existing building. Metal roofing is an excellent choice for steep slope retrofit roofing projects. There are a number of retrofit options available to cover asphalt shingles, modified bitumen or BUR eliminating the need to landfill old roofing materials. Then, you receive all the advantages of the new metal roof.

What are some additional advantages of a Cool Metal Roof?

Other possible advantages of installing a Cool Metal Roof include:

  • Reduce air pollutants
  • Lower maintenance expenses
  • Lower energy costs
  • Possible tax credits from federal, state and local governments
  • Possible insurance breaks for using metal roofs

If I want to do additional research, what are some websites I can look at?

What is the recyclable content of your metal panels?

The composition of our metal roof is about 25%-35% recycled material.

Does NAR sell metal buildings?

No, I’m sorry we don’t, but we will be more than happy to get you in touch with someone who can help you.

Does NAR offer any aluminum panels?

We do offer some perforated material for soffit panels (flush profile) and perforated for 3’ wide screw-down panels typically in White only. For other colors please inquire.

Can I get a special color to match my other buildings or equipment? How long will it take?

We do special colors however it is expensive when only a small quantity is needed. A minimum is charged for small quantity special colors. The lead time upon a receipt of a signed color sample would be between 4-6 weeks.