Oil Canning In Metal Roofing: What Is It and Can It Be Fixed?

December 1st, 2016

Oil canning in metal roofing is visible waviness, bulking, or rippling of the metal that affects flat surfaces of the roofs between the standing seams. This problem affects all metal panels, including copper, zinc, steel, and aluminum. The degree of the waviness tends to change under different lighting conditions.

What Causes Oil Canning?

This problem occurs due to uneven Oil Canning on Metal Roofing - Classic Metal Roofs LLC stresses during the milling process. Metal roof production mills use rollers to form coils and sheets. These rollers have small gaps that separate them, not allowing proper distribution of the stress. Several types of stresses may contribute to oil canning, such as full center, wavy edge, and camber. Other causes of this problem include uneven roof decking, thermal expansion, improper storage and handling, poor metal roof installation, and movement of the supporting structure.

How Can it Be Prevented?

Coil producers and panel manufacturers oilcanning2
can work to minimize unintentional uneven surfaces by maintaining their tooling. Manufacturers may need to use tension-level coils to eliminate the chore of re-cutting panels. Transporters should cushion the panels and use crates to enhance protection. Spreader bars can be used when carrying bundles of panels, and the panel should be stored on flat surfaces while awaiting installation. During installation, proper alignment and careful measurements of the panels must be taken to eliminate any chances of uneven support. The metal roofing company should also avoid over-driving the fasteners since this can cause waviness. Backer rods installed behind the panels will help eliminate oil canning by providing a slight upward pressure to each panel.

Can Oil Canning Be Fixed?

The short answer is no. Very little can be done to correct oil canning in metal roofing, and there are no metal roof repairs to help with this issue. For extreme cases, the only solution is panel replacement. However, some flat pan tongue-and-groove wall panels that have waviness can be fixed by adjusting the internal supports to put tension on the face of the panel. Most importantly, the metal roofing company must be careful during the installation process. Be sure to hire a qualified metal roof installer, who is up to date on the latest product improvements and installation methods available to insure the threat of oil canning is significantly reduced or altogether eliminated.

unfortunate oil canning situation on a standing seam metal roof

This is not what the homeowner expected to see when the project was completed.

 

 

5 Reasons to Have Your Metal Roof Installed Before Winter Hits

November 16th, 2016

With winter around the corner, it is a good idea to install a new metal roof before the blizzards start. Here are five reasons to get it done sooner rather than later.

No Snow On Metal Roof - Classic Metal Roofs, LLC.1. Eliminate Water Damage from Ice and Snow Accumulation on Roof

A strong and durable metal roof resists the damage caused by ice dams and accumulating snow. During unusually harsh winters, the cumulative weight built up on a poorly insulated and ventilated roof can be significant. With watertight installation, metal materials eliminate water infiltration and gradually shed snow and ice, minimizing the burden on top of your house.

2. Energy Saving: A New Roof Will Keep Your Home Better Insulated

With fewer age-related holes and gaps, less heat will escape through an insulated, metal roof. Increasing your energy efficiency means lowering your heating bills – a welcome relief in any season, but especially in winter when heating costs can skyrocket.

Standing Seam Metal Roof In Snow - Classic Metal Roofs, LLC.3. Snow and Ice Can be Directed to Slide Off of Roof

Metal roofing is an especially popular roofing choice in cold and snowy climates. The roofing material is durable and designed to shed ice and snow in a clean sweep. Measures can also be taken to keep large amounts of snow and ice from falling into high-traffic areas, such as walkways and building entrances. For example, snow guards can help to break up large snow and ice chunks to avoid the “avalanche” effect.

4. Environmentally Friendly and Sustainable

While most people may think that automobiles contribute the largest portion of greenhouse gases, it is actually buildings that are responsible for up to 48%. Today’s traditional aluminum metal roofs are coated with a PVDF resin known as Kynar 500. With this coating, metal roofs can reflect from 25% to 97% of the heat gain that would normally be absorbed into a house. There are also recycled roofing options from industrial metal scrap and post-consumer aluminum beverage cans.

Furthermore, with a Lifetime 50-year non-prorated limited warranty from a reputable metal roofing company, you won’t be replacing your roof every 12-20 years. Instead, you will have a sustainable product with covered repairs and replacement for as long as you own your home.

5. Get a Federal Income Tax Credit

Have you heard of the federal income tax credit for energy efficiency? You can get a credit of value up to $500 for residential energy efficiency efforts on your existing home, but it expires on December 31, 2016. This tax benefit is another great reason to take care of your roof before the worst of winter hits.

6 Reasons a Metal Roof Can Increase the Value of Your Home in 2016

June 3rd, 2016

When considering new roof options for your home, it is easy to disregard metal as a potential material. For many of us, the words “metal roof” prompt mental images of sheds and barns or agricultural storage buildings. However, the metal roofing industry has come a long way in recent years – and the national demand for metal roofs has risen accordingly. Metal roofing options offer numerous benefits that boost the value of your home, making metal roofs worth a second look.

1. Strength

Among roofing material options, metal is an unequaled way to protect your home from severe elements like rain, wind, and hail. Metal roofs are strong enough to walk on without worry – distinct from most asphalt shingle roofs, which would require extra care to keep from damaging the shingles. Home buyers seeking a sturdy source of protection for their home, especially in climates which see severe storms from time to time, will willingly pay extra for the added durability and protection offered by a metal roof. Installation costs may be higher but a metal roof will need fewer repairs and incur lower maintenance expenses over time than a shingle roof. Those lower expected maintenance expenses add to the home’s value.

2. Lifetime Roof

On account of their inherent strength and durability, and thus longevity, metal roofs can significantly raise the value of your home. If properly maintained, a new metal roof can last the lifetime of your home, which means that you – or a prospective buyer – will not have concerns investing in or dealing with the disruption of installing a new roofing system down the line. Many manufacturers offer warranties from 30 to 50 years, in contrast with the average warranties for asphalt shingle roofs, which typically range between 10 and 20 years depending on the climate in your area. (And collecting on such a warranty requires that the installer still be in business and in good financial shape.)

3. Energy Efficient

Metal roofs are very energy efficient, which is one of the driving factors behind the increasing demand for metal roofs. Many people have the preconception that metal soaks up the sun’s rays, potentially overheating the home. In fact, metal roofs reflect light, and thus heat, in the summer and help to insulate a property during the winter, allowing homeowners with metal roofs to save up to 25 percent on heating and cooling costs. Such savings are attractive to environmentally conscious shoppers in the real estate market, and could increase a home’s resale value.

4. Reduced Homeowners Insurance

Thanks to the superior durability and resistance to damage of metal roofs, many homeowners insurance carriers are willing to reduce the premiums they charge for homes with these types of roofs – some by as much as 35 percent. The savings vary depending on the climate. Areas, for example, that experience frequent severe weather tend to offer better savings than is the case for homes situated in milder climates. Check with your insurance agent to obtain details.

5. Curb Appeal

Generally speaking, the metal roofing industry has moved far beyond using simple sheet metal. With a wide range of finishes, colors, and styles, metal roofs can be crafted to match the existing aesthetic of your home or to mimic the classic look of a shingle or shake roof. While you may not initially think of a metal roof as the most attractive option to increase the value of your home, with the wealth of available options you can design a roof that adds distinction to the exterior of your property.

6. Increased Market Demand

The aforementioned benefits and a range of additional advantages have led to the increased demand for metal roofing. Home buyers have shown that they are willing to pay more for homes with this durable and aesthetic option installed. Adding a metal roof to your home can increase your property’s value by one to six percent overall.

With its superior durability, classic appearance, energy efficiency, and more, metal roofing is certainly worth consideration by anyone roofing their home. Knowing that your investment in a metal roof will be reflected in an increase the value of your home when it comes time to sell reflects and enhances those benefits.

Metal Roofs: Eight Myths Uncovered

May 19th, 2016

Myths come and go about metal roofs. The transformations of and improvements to the metal roof product that have occurred over the years render these myths largely obsolete. Following are eight of the today’s most common myths – and answers to them.

1. Metal Roofs Are Ugly

On the contrary, today’s metal materials offer more options than any other kind of roofing on the market. There is a wide range of materials, colors, finishes, and styles available. It is safe to state that aesthetic quality is a strength, not a weakness, of metal roofs today.

2. Metal Roofs Are Noisy

Not true. In fact, these metal roofs installed using modern techniques may be quieter than an asphalt shingle roof. Typically, a metal roof is installed by fastening solid sheathing to an existing roof that already benefits from insulation and attic space beneath it.

3. Hail Damage

Large, heavy hailstones can damage any roof – asphalt, wood, or metal. Normal hailstones do not.

4. Colder in Winter

A metal roof does not affect the temperature of a vented attic in the winter. It is the insulation under the roof and of the attic floor that helps retain a house’s heat in the winter.

5. Hotter in Summer

The exact opposite is true. Based upon the finish, metal roofs reflect much of the solar radiation normally absorbed by an asphalt roof, especially if the roof color is white or another light color. This helps keep a house cooler in the summer.

6. Metal Roofs Attract Lightning

Not correct. Lightning is attracted to the tallest object in the area. The roofing material per se is not a factor. If lighting should strike a metal-roofed house then the metal would conduct the electrical charge. The metal roof would disperse the energy throughout the structure, lessening the possibility of a fire erupting when resistance is encountered and heat then generated when the electrical charge attempts to ground itself. Since metal is not flammable or combustible, it can be a safer roofing option than other materials.

7. Metal Roofs are Expensive

Because the replacement costs of repeat asphalt shingle installations accumulate over the lifetime of a single metal roof, an asphalt roof installation (i.e., multiple asphalt roofs) can cost two to four times the price of a metal roof over the latter’s lifespan. A metal roof will likely cost more up front than one composed of asphalt shingles. But the total cost of roofing when considered over the relevant timeframe militates in favor of the metal roof choice.

8. Metal Roofs Have No Resale Value

Experience indicates otherwise. In fact, metal roofs are highly valued. According to Remodeling Magazine, homes that have been renovated with metal roofing recover 85 percent of costs nationally – and up to 95 percent for homes in the eastern U.S. Home buyers are well aware of the value a metal roof adds and are willing to adjust their offering prices accordingly

Residential Solar Power Economics Are Compelling – With or Without Subsidies

May 19th, 2015

Almost as inexorable as death and taxes has been a rising secular trend in the demand for electricity in the United States – at the utility companies/wholesale level, that is. Or so we have always thought. Yet, since the summer of 2008 electricity demand as seen by the utilities has marginally declined. That has not happened so consistently for so long since the 1930s Great Depression. What is going on?

The stagnant economy, an aging population, conservation measures, and the initial steps towards rationalizing the nationwide grid into a “Smart Grid” have played roles. The latter initiative will play an important role for years. Contemplate the U.S. grid as a giant electricity generation and distribution plant, and then think of the possible efficiencies enabled by bringing manufacturing standards from the 1960s into the 21st century and you will get some idea of the potential. However, another even more exciting trend driving the decline of electricity demand at the grid level is the plummeting cost of solar power generation.

Those of us who have kept an eye on solar power for decades do a mental double take when informed that at long last solar power is economic versus the cost of buying electricity from your local utility. But it is. It is no longer a niche option suitable for remote locations far from the grid or for early adopters who feel they have the luxury of making an ecological statement independent of of the pecuniary cost/benefit calculus. A recent Deutsche Bank report (link here) surveyed a wide spectrum of developed and developing countries around the world and concluded that in many of them, including in the United States, the cost of solar power is already below the cost of retail electricity and will soon approach wholesale averages for fossil fuels. Solar power’s day in the sun (please forgive the bad pun) is at hand. From the Deutsche Bank report:

“The economics of solar have improved significantly due to the reduction in solar panel costs, financing costs and balance of system costs. Overall solar system costs have declined at ~15% CAGR (compound annual growth rate) over the past 8 years and we expect another 40% cost reduction over the next 4-5 years.”

Note that this conclusion holds for unsubsidized solar power residential, commercial or industrial installations. The various tax credits and other subsidies available to user-level installations in Massachusetts and other states nudge the economics for the homeowner further in the positive direction.

Why are we highlighting this exciting (to us, anyway) news in this blog? We are glad you asked. As has been featured previously on this blog, here, metal roofing plus solar is a “dream team,” for a variety of reasons. Here are the major ones:

(1) Unless you want to have to de- and then reconstruct your solar panel installation before its time, solar-on-asphalt is a manifestly poor idea. Most solar manufacturers have a warranty of 25 years. Asphalt roofs last an average of 16-years, contractor’s claims or nominal promises notwithstanding. Need we say more?

Well … yes, actually. Aluminum roofing outlasts the solar panel system’s expected 25-30 year lifetime. Solar panels can be installed on standing seam metal roofing with attachments that do not penetrate the roof or add ballast.

(2) Asphalt roofs are inherently prone to failure, large and small. (Two words for those who just came through this past coastal New England winter: “ice” and “dam.”) Integrating solar with asphalt will exacerbate that tendency due to the increased load and roofing penetrations. The roofing perforations required for the installation of a solar panel mounting system increase the likelihood of leaks later, ultimately shortening the already short lifespan of the asphalt roof.

(3) As discussed on our “Why use Aluminum in Construction?” web page, here, aluminum roofing has environmentally compelling points in and of itself. Why combine an environmentally friendly power generation source with an environmentally destructive roofing material such as asphalt?

Classic Metal Roofs, LLC has years of experience in the field. Many homeowners disclose in conversation that they are planning on having a metal roof installed and then intend to have solar panels mounted on the roof later. If you do plan to mount solar panels on your metal roof then the metal roofing contractor absolutely must be informed about this. This cannot be overstressed. Metal roofing requires substantially reinforced fastening when solar is in its future. In most, if not all, cases if you already have a metal roof and did not have solar taken into account during installation, your roof may be unable to successfully withstand a subsequently attached set of solar panels.



Classic Metal Roofs, LLC Classic Metal Roofs, LLC Classic Metal Roofs, LLC Classic Metal Roofs, LLC
264 Gleasondale Road
Stow, Massachusetts 01775
Telephone: 978-562-7770
(toll-free: 866-660-6668)
1 Tara Blvd.
Nashua, N.H. 03062
Telephone: 603-324-7187
(toll-free: 866-660-6668)
1224 Mill Street, Building B
East Berlin, Conn. 06023
Telephone: 860-828-2050
(toll-free: 866-660-6668)
88 West Warwick Ave
West Warwick, R.I. 02893
Telephone: 401-821-0024.
(toll-free: 866-660-6668)