Top 70 Metal Roofing Facts, FAQs & Pros and Cons – Consumer Guide 2015-2016

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It’s Spring time again. Is your roof ready to weather the upcoming steamy-hot summer, followed by another harsh winter with its fearsome snowstorms, strong winds, and occasional hail?

Rustic House with a Metal Roof

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I do not know about you, but if you ask me, I would tell you that a metal roof is a great way to protect your home if you happen to live in the region that receives a lot of snowfall. — Just ask any resident of Illinois, Ohio, upstate New York, Northern New Hampshire, Maine, Vermont, and they will readily attest to this! πŸ˜‰

With that being said, If you are still considering installing a new metal roof on your home or commercial property this Summer or early Fall, here are the top 70, most essential metal roofing facts, with FAQs and pros and cons to consider in your buying and decision making process.

In order to help you navigate this long list, we broke it down into the following categories:

Materials Pros & Cons Standing Seam Metal Roof Galvalume Color
Cost of Materials
Cost of Installation
Colors & Styles
Weather Protection
Energy Efficiency
Environmental Impact
10 Bonus Facts

Materials Pros & Cons:

standing-seam 1. Metal roofs can be made from a variety of metals and alloys including Galvanized steel — hot-dip zinc galvanized G-90 and G-60 steel (a less expensive thinner grade steel often used in low-cost corrugated metal panels), Galvalume steel — zinc and aluminum coated steel (A more expensive and longer lasting coating compared to G-90 steel.), stone-coated steel (G-90 galvanized steel), aluminum, copper, zinc, terne (zinc-tin alloy), and stainless steel.

2. The downside of galvanized steel (G-90, and especially G-60) is that it can corrode, eventually, especially when exposed to moist salt spray environment such as in close proximity to coastal areas.

3. Steel is the most frequently used material in both residential and commercial applications, mainly due to its lower cost.

4. Aluminum is the second most popular material. It is more durable and longer lasting than steel, but only costs a fraction of the price of premium metals, such as copper or zinc.

5. Aluminum is also one of the best metals to use for roofs located in coastal areas (think those beach homes), where there is a heavy presence of salt spray in the environment.

6. Copper roofs are the most durable and can last for hundreds of years. However, due to prohibitively high cost, few people choose to install an entire roof made from copper. Instead, home and business owners choose copper for architectural details/accents on the roof (bay windows, towers, porches, low slope roof sections, Et cetera).

copper standing seam bay windows

Cost of Materials:

7. A typical cost for a steel standing seam roof starts around $300 per square (100 square feet) for a typical order. Stone-coated steel starts at standing-seam-panels $350-425 per roof sq. Steel shingles run about $270 per square of materials.

8. Aluminum is a step up from steel in terms of quality, and therefore in price, costing about $100 more per square than galvanized steel, for both standing seam and metal shingles.

9. The most expensive and premium metals are copper and zinc. They cost roughly the same. Copper is typically installed as copper pans or standing seam panels costing $900-1,400 per square. for materials alone.

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10. Steel roofs need to be coated with a special protective (galvanic) coating to prevent corrosion. – Galvanized and Galvalume steel roofing systems are pre-coated by the manufacturer and do not require any further coating.

11. Aluminum, copper and zinc roofs do not need to be coated.

12. High-end Aluminum and steel roofing systems like standing seam and metal shingles will usually have a high-quality paint finish such as Kynar 500 applied, while lower-end corrugated steel roofs are usually finished with Acrylic paint.


13. It is typically possible to install a metal roof over an old roof, thus eliminating the extra standing-seam-metal-roof-installation cost and hassle associated with the shingle tear-off (be sure to consult your contractor about the possibility of “over-top” installation for your specific roof). — This is generally possible because metal is an extremely light-weight material.

14. Metal roofs should only be installed by specialists with expertise and ample experience in installing metal roofing, because if the installation is done incorrectly a metal roof will develop leaks (or outright fail prematurely as in the worst case scenario), which may later end-up costing thousands of dollars to repair or replace.

15. Unlike many other roofing materials, a metal roof can easily be installed in the winter.

16. The cost of installation for metal shingles is about 20% cheaper than the cost of installing standing seam, because metal shingles are easier and faster to install.

Corrugated Metal Roof

17. Most metal roofing systems should be installed on homes or buildings that have a minimum slope of 3:12 or greater. Although there are certain types of standing seam metal roofing systems that can be installed on roofs with slopes of 2:12 and lower, those types of systems are usually only installed on commercial or industrial buildings.

18. Ideally, standing seam should not be installed over asphalt shingles due to telegraphing of the shingles underneath the standing seam panels.

19. Further, when snow piles up on a standing seam roof that was installed over an asphalt roof, the shingles will likely make horizontal dents in the metal panels. Also, metal roofs tend to expand and contract due to temperature changes, and can thus rub against the stone coating on asphalt shingles. – This could eventually cause some corrosion and rusting on the underside of metal panels.

20. Standing seam roofs can be manufactured either on-site or in the factory, which simplifies the installation process. Metal shingles are typically manufactured at a factory, and can be shipped in standard cardboard boxes directly to your house or work-site.

Cost of installation:

21. Metal roofing installation is more expensive compared to other roofing systems, standing-seam-metal-roof-installation because it requires specialized training, knowledge, tools and equipment that general roofing contractors typically lack.

22. The cost of installation greatly depends on the complexity of the roof and the type of material/system installed.

23. The base price to install a corrugated steel roof starts at $450 per roof sq. for materials and labor.

24. The base price for metal shingles ranges between $700-1,000 per roof sq. for materials and labor.

25. The base price for a stone coated steel roof starts at $850-1,100 per roof sq. for materials and labor.

26. The base price for a standing seam roof ranges between $750-1,400 per roof sq. for materials and labor.

27. The base price to install a copper or zinc roof starts at $1,800 per roof sq. for materials and labor.

28. If tear off is necessary, it is a separate cost, which runs about $100-150 per roof square.

You can estimate the cost to install a new metal roof including materials and labor with the help of a free calculator here. Other options: option 2, option 3, option 4, option 5.

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Colors and Styles:

29. Metal roofs come in two general styles: vertical panels and interlocking shingles Metal-Roofing-Colors

30. Many modern styles of metal shingles are manufactured to imitate the look of slate, clay tile, cedar shake, and in some cases even the traditional look of asphalt shingles.

31. Modern metal roofs come in well over 100 colors, which include standard, premium and customized colors. The number of color options for metal roofing is a lot greater than the options you get with asphalt shingles roofs (only about 15-20 standard colors).

32. The most popular style among homeowners is standing seam (vertical panels).

33. Often, homeowners are not even aware of the existence of metal shingles, and mistakenly believe that standing seam is the only option for a metal roof.


34. In terms of performance, there is no difference between standing seam and metal Standing Seam shingles roofs.

35. High-end metal roofs such as metal shingles/tiles and standing seam are considered a lifetime system. This means that if a metal roof is properly installed, you will not have to install another roof on your home or building again.

36. Metal roofs such as aluminum or steel shingles can last for 50 years and often longer, while copper and zinc roofs can often last well over 100 years. – This means that a typical metal roof will last about 3-7 times longer than a typical asphalt shingles roof, which usually needs to replaced every 12-17 years.

37. metal shingles roof Due to exceptional longevity, metal roofs have a very low life cycle cost. This means that while you may spend more upfront on a metal roof than on an asphalt shingles roof, in the long run you will actually save money, because you will not need to repair or replace a metal roof again.

38. Most manufacturers will provide a 30-50 year warranty, while your installer should offer you his own installation warranty.

Weather protection:

39. Metal roofs offer the best protection against ice, snow, and ice dams. snap-lock-standing-seam

40. Metal roofs are considered to be ice and snow-shedding systems, which means that you will never have to worry about roof leaks.

41. Metal is non-combustible, and so a metal roof will never catch on fire like cedar and some asphalt roofs.

42. Metal roofs will protect your house against hurricane level winds. Many system have wind uplift ratings of 110-160 mph.

43. FEMA recommends metal roofs in areas that are prone to natural disasters such as hurricanes, floods, earthquakes, etc.


44. Metal roofs will not rot, split, crack, dry-out, chip, warp, leak, unlike all other common roofing materials.

45. Metal is not susceptible to termite or rodent infestation.

46. Metal can withstand impact from falling objects such as hail, sticks, etc. without any damage to the roof.


47. Generally metal roofs require none or minimal maintenance. corrugated metal roof on a ranch house

48. Metal roofs can be cleaned with water.

49. Corrugated style metal roofs (with exposed fasteners) will require fastener re-tightening every 10-15 years.

50. After years of service, you may choose to repaint a metal roof to give it a fresh look again, but it is not necessary, and will depend on your roof’s original coating.

Energy Efficiency:

51. A metal roof can easily help save as much as 25% off of your annual home energy bill, and help reduce your building’s overall energy waste. In fact, according to a US independent report by the Oak Ridge National Laboratory “2008 ACEEE Summer Study on Energy Efficiency in Buildings“, homeowners can save up to 40% in home cooling costs in the summer, and 10-15% in home heating costs, based on a strapping system of 4 inches between the plywood and the metal on top.

52. A metal roof has a cool reflective surface, which reflects solar heat back into the atmosphere, rather than absorbing it inside a home or a building.

53. Copper and zinc are the least energy efficient types of metal roofing. Due to darker colors and thicker gauge of metal, they absorb and store a lot of heat. However, they are still much “cooler” than asphalt shingles.

Environmental Impact:

54. Metal roofing is the only TRULY green material in the roofing industry, because it uses the least amount of resources during the manufacturing process, contains no petroleum by-products, and can always be recycled.

55. New metal roofs may contain anywhere from 30-60% of recycled metal content, and are 100% recyclable at the end of their service lives.

56. Old metal roofs will never end up in our landfills at the end of their service lives, thus saving the ever-precious landfill space and helping protect the environment.

57. A metal roof (or any metal for that matter) can be recycled an unlimited number of times without suffering material degradation.


58. Out of all roofing materials available, metal provides the biggest return on your investment (ROI). The national average on cost recouped at resale is 85.9%. The average recouped cost on the East Coast is as high as 95.5%.

59. A metal roof will be a huge selling point to potential buyers of your home, who will be happy about the prospect of not having to worry about roof-related issues.

60. Homes outfitted with metal roofs will typically have a 6% resale value gain over homes with asphalt shingles roofs.

10 Bonus Facts:

You deserve a reward for getting this far! So, here are some equally important bonus facts to consider:

61. A metal roof will not increase the likelihood of your home getting struck by a lightning.

62. If a lightning does strike your home, a metal roof will safely dissipate the electric charge even if it is not grounded.

63. Metal Roofs act as a Faraday Cage for your house and they disperse the charge over a larger area as compared to a skimpy little wire coming down your chimney or wall. They also intercept 100% of the lightning that comes towards your house, unlike a lightning rod which only intercepts the lightning that happens to hit your rod. – You can read more about it here:

64. Modern metal roofs such as aluminum standing seam have a class “A” or UL Class 4 fire retardant ratings. If you happen to live in a fire-prone area, a metal roof can help protect your home from a forest fire, as well as help you save money on your home insurance premiums.

65. Many insurance companies will reward you with a hefty discount in the neighborhood of 30% on your homeowners insurance if your home is protected by a qualified metal roof. – You can read more about homeowners insurance discounts for metal roofs here:

66. If you happen to live in an area that often experiences a heavy snow fall, with freezing temperatures, a metal roof will shed off the snow, thus helping prevent a heavy snow accumulation and ice dams on your roof. – Read more about it here:

67. A metal roof can easily be outfitted with snow-guards to prevent the sliding of snow over door entrances and other areas where heavy snow fall is undesirable.

68. PV Solar Panels on Metal Roof A standing seam metal roof can easily be integrated with PV solar panels should you decide to take your home’s energy-efficiency to the next level. Learn more about solar power systems for homes here:

69. A standing seam metal roof can be easily combined with either easy to install “Peel and Stick” thin-film photovoltaic solar laminates, or with traditional and somewhat more powerful crystalline PV solar panels. – If your roof has a large area and faces south, or you are especially ambitious, then you can try to go off the grid completely! – Read more about it here:

70. If you are concerned about “noise” when it rains, rest assured knowing that a metal roof installed over solid sheathing (whether wood planks / boards or plywood) will be as quiet as an asphalt shingle roof. The difference in sound level (measured in decibels) produced by rain drops hitting the roof surface of an asphalt shingle roof compared to metal will be largely undetectable to human ear.

Bottom Line:

A metal roof offers better ROI (in terms of home appreciation and maintaining a very high recouped value of your initial investment) than any other remodeling upgrade. – This can be especially important if you care about maximizing your home’s value and curb appeal for many decades to come. Should you ever decide to sell your home, you are almost guaranteed to come out a winner, especially if you’ve lived in your home for quite some time, while enjoying solid protection, great looks, curb appeal, and energy savings that add up over the years and help shield your wallet from rising energy costs.

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  1. I live in Arizona, in an area that regularly experiences extreme wind and hail storms that can easily damage siding, windows, and roofs on houses around here… I have recently bought a house with an older roof that needs to be replaced soon. So, I am trying to decide on whether I should go with a metal roof or shingles.

    So far, I’ve gotten a couple of roofing estimates, and standing seam metal roofing came in at about twice the cost of 30 year shingles. I am wondering if a metal roof is worth the money? The contractor also says that I can get a far better insurance rate with a metal roof.

    1. Hello Bob,

      As far as I can tell, a standing seam metal roof may indeed be a better option for you, and here is why; you mentioned that the area you live in is subject to some serious winds and hail storms that can easily damage an asphalt shingle roof. If you go with asphalt, there is a significant risk of some serious roof damage from wind and hail down the road. You may save some money today, but you may well have to replace your roof again, just a few years from now, at which point I am pretty sure you will go with metal. Why not do it off the get go!? – You could get security and piece of mind by installing a metal roof, which would be a much better defense against strong winds and hail storms compared to a 30 year shingle roof.

      Also, as you have mentioned, there your homeowner’s insurance premiums would decrease if you choose to go with a metal roof. Furthermore, consider some significant energy savings if you opt for an energy star rated metal roof, which could help you save some 20% to 30% on your cooling costs. I dare say that in Central Arizona, it can add up to a good chunk of change! πŸ˜‰

    2. We bought a metal roof, one with the pebble like coatings glued on in 2004. Was beautiful at first. One side, south, started to have the coating come off and the company we bought it from said it was just a bad batch and they replaced it. Since then the whole roof has the coating coming off leaving a rust looking roof. Also in the meantime the company either went bankrupt or sold to another company. We are not getting much use of the 50 year warranty (sales bull) that was a big part of the sales pitch we fell for.

      Now, the new company is still selling steel roof with coatings that are “supposedly” much superior then the old. Since our problem started we have looked at a lot of metal roofs in Ontario and see the problem is very prevalent. We are getting prices on having the old metal taken off and replaced with this new stuff. Hope we don’t fall for their bull again.

      My advice is don’t buy a metal roof with the stone coating on it. It may look good for eight or ten years but not the last 40 years off the useless warranty bull.

  2. The article mentions that standing seam metal roofs should not be installed over asphalt shingles. Yet, a contractor I have been speaking with says if you install underlayment between the shingles and the metal, there is no problem. Do you agree with this?

    1. Hello Louise,

      In short, it’s best not to install standing seam over asphalt shingles. Even with underlayment, expansion and contraction of the metal will eventually cut the underlay, and granules in the shingles will scratch galvanic coating off of the metal panels causing rust.

      If you use aluminum this will not be an issue, but aluminum is an expensive LIFETIME roof, so putting it over shingles (where removal is a small fraction of the total cost) and not addressing any rot and ventilation issues is just careless!

      If you live up north, snow WILL puncture UGLY horizontal lines through the metal…

      Best advice – remove shingles, repair any problems with the roof deck and ventilation, and only then install your LIFETIME roof!

      Good Luck!

  3. We live in Maryland near DC. We have both cold winters and hot humid summers. What color metal roof would offer the most energy efficiency?

    1. Hello Nancy,

      The lighter colors tend to be more energy efficient than darker colors, with white color being the most energy efficient in terms of its solar reflectance. Look for a CoolRoof and Energy Star rating for the color and system you consider.

  4. For anyone considering NOT installing a metal roof due to the additional costs or because you think that a 30-year or lifetime warranty on asphalt shingles is good enough, you should do some investigation of just how little the shingle companies stand behind their product. We put a lifetime product on our lakehouse about five years ago and the shingles are failing rapidly. The company, BP spends virtually zero money of honoring the warranty. All of their energy goes to avoiding any payout on their warranties. Read the warranty and you will see that they only cover materials (about 25% of the cost of a roof) but real life experience shows that you will never get them to pay. You would have to hire a lawyer and go to court and would spend more than you would ever get. There is a class action suit against BP and I believe there is one against IKO too because their products fail quickly and they refuse to pay unless ordered to do so by the courts. I expected my “Lifetime” warranty would at least get me to 15 or 20 years. The product has barely made five years. I should have installed steel on day one. By the way, my contractor has the same problem as he installed the same shingles on his own home and the manufacturer just says “no”.

    1. Hey Stephen,

      Thank you for sharing your experience, which I think many homeowners can relate to. I agree, most asphalt shingles product warranties are not worth the paper they are written on! Almost all manufacturers of asphalt shingles use prorated warranties, meaning that they will never have to pay a full amount for brand new replacement materials, even if you can prove that your roof failed due to manufacturer’s faulty products. Hopefully your perspective will help some homeowners see the light, when they are at the crossroads of having to decide between composition shingles vs. metal.

      So, did you get that faulty asphalt roof replaced with steel roofing? If so, did you go with standing seam or metal shingles? How do you like it?

      Once again, I’m sure many homeowners will appreciate your take on this.


  5. I was wondering about what the down side is between wider panels vs, narrow? 21″ and 14″, besides aesthetic preferences… Also, with the thickness 24 versus 22 gauge? Other than the obvious, does it make that much difference?

    1. There is a greater chance of “oil canning” of metal with wider panels. The greater the thickness the longer the steel panels will last. Are you close to the ocean? Is this for a house or barn?

        1. Steel standing seam panels will work fine, because you are not in close proximity to the ocean. If you were within a mile of the shore line I would def. recommend aluminum panels, then. To avoid oil canning I would not use very wide panels, plus they would not look good on a residence. I think 14 inches would look way better than anything over 20 inches wide. Also, aluminum may not be a bad option if the cost is comparable to steel. Remember, you do not have to worry about any rust issues with aluminum! πŸ˜‰

          Let us know what you decide, and share some pictures once the roof is installed. Good Luck!

  6. Hi Everyone,

    I live in the tropics, about four years ago I installed metal (alumzinc) stone coated tiles manufactured in New Zealand. In less than two years, I experienced stone loss on my stone coated roof. Every time its rains the stone coating is washed out by the rain water.

    Recently, I called on the local dealer of the imported roof tile from NZ to inform them of the severe stone loss of my roof. They got a sample of my roof and send it to NZ for testing and evaluation. I was told that the roof sample is covered by black algae and no plausible reason why there was stone loss.

    I was told that under the warranty, stone loss due to growth of organic matter could rescind the warranty. The warranty period is 25 years for the surface coating and 65 years for the metal sheet.

    If I may borrow the words of Alex, I agree with him that most warranties are not worth the paper they are written on. Almost all warranties are in favor of the manufacturer and the homeowner has no say to it. They will always find ways not to pay or replace the defective material as in the case of my NZ supplier.

    I think the brand I am referring to is also available in your country and through my travels I have see this type of material installed in many homes.


  7. We have a 100+ year old cottage that is in the middle of a freshwater lake in Michigan. It is on Cases’s Island in Fenton Michigan. We are seriously considering a metal roof as it would be the last roof the house would need in our life time and because it is on an Island it is a logistical nightmare to get the old shingles off the island and back to mainland. Which roof would you recommend? We have been given a quote for “barn Steel” not much more than a few hundred dollars compared to traditional shingles. Can you please advise? Here is a link to a photo of the cottage. I am thinking of going with a green roof.

    1. Hi Debbie,

      I’ve taken a look at the picture of your cottage house and based on the type of the roof you have, and the fact that your would like it to be the last roof, I probably would not recommend going with a barn steel roof (a system with exposed fasteners), also known as corrugated steel roofing, unless the total cost of a new metal roof is a significant deterrent to you considering going with either standing seam or metal shingles, instead. – These two options are more expansive, but offer a much higher chance of having a lifetime roof in terms of durability, longevity, and not having to deal with roof maintenance issues. – Needless to say, regardless of which system you ultimately choose, it will need to be installed the right way to derive those lifetime benefits the metal is famous for. πŸ˜‰
      As far as your concern of getting old shingles away from the island, you may be able to roof over the existing shingles, with metal shingles, if there are currently no more than one layer of shingles in place. However, if there are currently two or more layers of shingles on your roof, it may be a wiser option for you to do a tear off (perhaps in section) before a new metal roof is installed.

      If you prefer to have a pricier standing seam panels option (it’s the same in terms of quality as metal shingles, but panels do cost more.) installed, I would advice performing a complete tear off of the old roof before standing seam is installed.

      All other things being equal, the quality of installation is the key to having a long lasting metal roof, so make sure you do your due-diligence when selecting a metal roofing installation company for this project.

      Also, all other things being equal, I would recommend aluminum vs. steel as there is not really that much difference in cost of aluminum vs. steel, whether it’s metal shingles or standing seam.

      Should you decide to go with a barn roof/corrugated roofing panels to save money, make sure you go with the higher-end of the panel such as Kynar-coated aluminum, or galvalume steel. G-90 steel would be next in line. Avoid G-60 and acrylic paint coatings.

      Finally, make sure there is an installation warranty provided with the job, and that the company has been in business of installing metal roofs for some time before you trust them to install a metal roof on your home.

      Good Luck!

  8. Hi,
    Can you tell me about the range of manufacturers and quality standards to consider for standing seem less panels? I am in northern Wisconsin. Where do we source product besides Lowes.

    1. Hello Kevin,

      Many building materials warehouses including ABC Supply, Beacon Supply, and Harvey’s Industries will often carry metal coil from manufacturers such as Atas, Fabral, Peterson Aluminum, etc. Look for EnergyStar and CoolRoof ratings and certifications. Paint coating wise, Kynar 500 coating is one the most widely used industry’s paint finishes backed by a 30 year warranty. Look for a warehouse that has a dedicated metal fabrication shop to form the panels for you. The building supply store will also tell you about other options in terms of ordering metal shingles, tiles, standing seam, corrugated panels, and any other options. The person in charge of their metal roofing products can share a catalog covering various types of systems, colors, and their costs.

      Try to avoid low-end acrylic paint finishes. — Here is more info about various types of coatings and color options:

  9. My husband and I live in the Midwest and know we want a steel roof, but we are looking for info on horizontal steel roofing like what ABC seamless sells, if anyone has it and if it is a good as standing Seam roofing?

  10. Hi Mrs. Lloyd,

    I’ve checked out their horizontal seamless panels product-line, and the only potential concern I see is that it’s made from G-90 galvanized steel (steel sheets dipped in hot zinc), not galvalume (zinc and aluminum coating). It’s generally preferred to go with galvalume vs. galvanized steel. — This may not be much of a concern, if you don’t live near the ocean, with high concentration of salt spray in the air.

    Further, there is some concern with panel expansion and contraction given the potential length of the steel panels being installed. Lastly, you need to make sure your home has a sufficient pitch for their seamless system.

    I would check with the manufacturer to see if your roof would be a good candidate for this system, and whether they have an approved installer in the area. Make sure that only trained and experienced installers work on your roof. Remember, metal roofing is not the same as shingles. It requires specialized skills, tools, training, and equipment. You also want to make sure the company will be around to honor the labor warranty should there be any issues. Make sure you check a potential contractor’s reputation before signing a contract!

  11. Hi all,

    I have a metal roof. I live in western mass. My problem is that we have a very old white oak that towers over our house and its sap stains the roof, the snow does not slide off because of it! Do you know of something to remove the stains? Also it’s a red color roof. Thanks!

    1. Hi Richard,

      Most surface soils or stains from industrial fallout, tree sap or chimney affluent can be cleaned up with non-abrasive household detergents. A mixture of one part Ivory to three parts water is recommended as a general purpose cleaner. The solution should be applied with a clean, soft rag or sponge using a gentle rubbing action! Please be careful, as vigorous cleaning will remove the stain resistant surface and therein develop further staining in the future.

      Rinse immediately and thoroughly after washing with fresh water. See more info on metal roof cleaning here.


  12. I am thinking about putting a metal roof over shingles. My question is when you start a screw in the metal and hit a nail head from the shingle or plywood what do you do?

    1. Hi Bill,

      You can simply apply some silicone over the underlayment where you made a hole when hitting a nail head. Yes, you need to have underlayment installed in between the old shingles and a new metal roof.

  13. I have a few questions. As far as condensation issues with metal roofs. If using Grace membrane on top of plywood sheathing with 1″x4″ purlins 2′ on center horizontally under the metal sheathing – with Styrofoam sheets between the purlins. ( Do you need to add the Styrofoam sheets between the purlins?) I understand they have different R-values depending on what you want – but are they necessary?
    What is the chance of condensation leaking through to the plywood beneath? Or the damning effect of condensation between the purlins becoming a issue. ( Rotting the wooden purlins over time.)

    Does this moisture evaporate on its own?

    also, for the top where the ridge vent is – they offer foam blocks that match the profile of the metal roofing – If you use the same blocking material for the drip edge side – how does the moisture accumulation evaporate? Is there something else offered for the drip edge side to keep insects etc out.

    1. Hi Annette,

      First of all, never ever block the soffit vents (over by the drip edge) or ridge vent, that’s your roof’s ventilation (breathing) system, with soffit vents playing the role of air intake circulating through your attic space and escaping via the ridge vent (exhaust). If you block it, your attic space will get warm and moist exposing your home to ice dam related issues during the winter, as well as moisture and deck rotting issues year round.

      Is grace membrane a breathable underlayment material designed to allow any moisture and condensation to evaporate? If not, I would recommend going with the GAF deck armor breathable synthetic underlayment.

      Good Luck!

  14. Hi, Alexander.

    My brand new 24 gauge Kynar 12” wide standing seam roof is suffering serious oil-canning in the summer here in Vancouver, BC. And, Vancouver ‘s not really all that hot.

    What do I do now?



    1. Hi Euan,

      Normally, there are a couple of ways to prevent oil canning in standing seam metal panels:

      1) forming stiffening ribs in the middle of the panel, which I’m guessing was not done in your case.

      2) Allowing for thermal expansion and contraction of the panels by using clips that allow for thermal movement during the installation, or installing nails/screws in the middle of the nail strip to allow for expansion and contraction.

      Since, those aspects of standing seam can only be achieved during the installation process, your only remaining option is to make sure your attic space is properly and adequately ventilated in order to keep it (and your metal roof) nice and cool during the summer and winter.

      Are there any soffit and ridge vents on your roof to allow for air circulation?

  15. Thank you for sharing all of this information about metal roofs. I have debating on what type of roofing I want to have installed. I am trying to decide between cedar and metal. Both of them last much longer than asphalt shingles. It’s good to know that having metal roofing does not increase the likelihood of being struck by lightning.

  16. I am having trouble finding someone in my area (Austin, TX) who is experienced in painting metal roofs. People seem to think it is very odd when I say that I want to do it. I hate the color of our roof, so want to update it with a new coating of paint. Do you have any advice as to where to look for someone to do this task and what type of materials I should be asking for?

    1. Hi Jordan,

      The key is to use the type of coating that is on par with Kynar 500/Hylar 5000/Alunar coating. Not acrylic, because it will chip and peel. Check out with metal roofers in Austin, TX on 150 Points here.

      Good Luck!

  17. Hi
    We installed a steel roof on our cottage in 1995. We are located north west of Kingston Ontario so lots of cold, snow and then hot summers. Haven’t had one issue with the roof but now I am tired of the colour and would like to update. (It is green and I would like to change to a taupe or grey) I am afraid to paint it as there have been so many cases where the paint starts to peel off. Is there a paint product that will adhere to the steel and not peel and last another 21 years?

  18. Does it take that much longer to install metal shingles compared to asphalt shingles? Here, for a shingle roof like mine (2800sqft), the roofers want $7K for asphalt and $20K for metal. I checked the prices for metal shingles materials and it amounts to $8,100 for my roof, meaning the roofers want $11K for the installation — that seems prohibitively high compare to about $4K in labour for the asphalt shingles. I think I will stick with shingles with the hope they will last 12 years again.

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