Please read our frequently asked questions and the answers. Here you will find answers to all of your metal roofing questions.

FAQ Contents:

1) Why Metal Roofing?

2) Can Metal Roofing be installed over my old roof?

3) Will Metal Roofing improve the looks of my home?

4) What about noise?

5) Which Metal Roof system should I use?

6) Will I have to remove my existing roof?

7) What does the “gauge” of the metal mean?

8) Does Metal Roofing cost more than conventional roofing?

9) Which Metal Roof system should I use?

10) Does a metal roof attract lightning?

11) What is oil canning?

12) Is all reflective insulation the same?




Why Metal Roofing?

– Metal Roofs are available in a wide variety of colors and shapes.

– Long lasting colors with no nonsense warranties.

– Over 20 years of exceptional durability.

– Metal Roofing is noncombustible.

– Metal Roofing will not absorb or be damaged by water.

– Metal Roofing will shed ice and water in the winter.

– Most steel products are made with recycled steel and contain at least 25 percent recycled material.


Can Metal Roofing be installed over my old roof?

Yes! Metal roofing weighs less than 1.6 pounds per square foot, depending on the gauge. It will not normally over load existing roofs. Metal roofing can usually be installed right over asphalt or fiberglass roofing.


Will Metal Roofing improve the looks of my home?

Metal roofing offers a wide variety of panel profiles to choose from. Nearly any design appearance can be achieved when using metal. If you desire a bold looking roof, a high slim rib panel which crates interesting shadow lines, or a low profile design, metal awards you the necessarry freedom to achieve your desired look.


What about noise?

Usually, metal roofing is installed over plywood and felt or an existing roof. Therefore, the sound generated by rain or hail would be similar to other roofing materials. The myth of a noisy steel roof comes from barns that were built with steel roofing installed on open framing and with no insulation.


Which Metal Roof system should I use?

There are two generic types of metal roofing systems for residential use – concealed fastener systems and exposed fastener systems.

As with most roofing options, installation is a large percentage of the total cost, and this varies widely depending on your specific geographic area and the complexity of your roof. Depending on the metal roof purchased, the total installation cost could vary from $125 to $1100 per square. A square is equal to 100 square feet and is the measurement that is used to determine the size of your roof coverage area for quoting. Since metal is a premium upgrade, you can expect to pay more up-front than you would for a quality asphalt shingle. However, over the life of the roof, metal can save you over 60% in total installation and maintenance costs. To make an informed decision, make sure your dealer or contractor quotes the full range of paint grades and gauges available. Stepping up to a premium grade typically adds very little to the overall cost since installation is such a large component. In many cases, a few hundred dollars can mean the difference between getting an unwarranted low-end grade or a premium grade with a Lifetime transferable warranty.


Will I have to remove my existing roof?

Because metal roofing is so lightweight relative to its strength, it can usually be installed over existing roof materials. It’s very common for metal roofs to be installed directly on top of asphalt shingles. This saves on labor costs and disposal fees for stripping the old roof, not to mention reducing landfill waste. Local building codes and the condition of your current roof’s substructure will ultimately determine if you can install in this manner.


What does the “gauge” of the metal mean?

The gauge is a measure of the thickness of the metal, but it’s important to remember that the metal increases in thickness as the gauge numbers decrease. B&M metals offers several gauge options. Listed in order from thinnest to thickest, they are 29, 26, and 24. It’s important to note that 29 gauge is the thinnest metal recommended for residential applications. Our heavy duty 24 gauge is recommended for those areas with severe weather, high winds, or hail.


Does Metal Roofing cost more than conventional roofing?

Every type of roofing material offers many levels of quality. Initially, metal roofing may cost more than some levels of other roofing types. However, the life cycle costs of metal roofing are substantially lower than other forms of roofing. The decision to use metal is usually based upon the fact that the homeowner doesn’t want to or can’t afford to replace their conventional roof every 8 to 12 years. B&M’s metal roofing will provide many more years of low maintenance service.


Which Metal Roof system should I use?

There are two generic types of metal roofing systems for residential use – concealed fastener systems (also known as Standing Seam) and exposed fastener systems. B&M metals offers many types of both. Generally, exposed fastener systems cost less than concealed fastener systems. Depending on the aesthetic look you are trying to achieve, your trained professional contractor, building materials supplier, or B&M metals can help you choose the system right for you and your roof design.


Does a metal roof attract lightning?

A metal roof has no greater chance of being hit by lightning than any other type of roof. Lightning typically targets the highest point in a given area, regardless of material. In the event that your roof is struck by lightning, a metal roof can actually help prevent damage by dissipating the electrical charge. Also, a metal roof is non-combustible.


What is oil canning?

Oil canning can be defined as a perceived waviness in the flat area of roofing and siding panels. Generally the period and amplitude of the wave depends on the continuous width of the flat. Oil canning is an inherit part of light gauge cold formed metal products, particularly those with broad flat areas. Profiles having wide flat surfaces are often referred to as “architectural” roofing and siding panels. Such panels are distinguished from corrugated shapes as the latter are more fluted in design, have much narrower flats, and are less likely to exhibit oil canning. Oil canning is an aesthetic problem. Normally structural integrity is not affected. Oil canning can sometimes be reduced or eliminated by adding ribs or striations to the panel but even these measures do not assure the elimination of oil canning. Since many uncontrollable factors are involved, Custom Metal Roofing, Inc. d/b/a B & M Metals, cannot realistically assure the total elimination of oil canning. Because of this, oil canning is not grounds for panel rejection.


Is all reflective insulation the same?

No, reflective insulation has different UV coatings.