Ever since mid 1800s, corrugated steel metal roofing has been used extensively on agricultural, commercial, and industrial roofs. You might remember the old barns, and farm houses covered with U shaped corrugated steel roofing. Corrugated roofs would often show rust in many spots of the roof. In those early days, corrugated roofing panels were made from bare non-coated steel, which accounted for excessive corrosion factor, which gave corrugated roofs a bad reputation at the time. Nonetheless, steel was a cheap and abundant roofing material, which made it economically feasible to replace the corroded steel panels as and when needed. Such were the expectations for the corrugated steel roofs of the time.
But what about today? First lets look deeper into what modern day corrugated metal roofing represents…
What exactly is Corrugated Metal Roofing all about?
Corrugated roofing is primarily made out of steel in form of U, V, R 5 V crimp shaped roofing panels. Corrugated metal roofing is a system of 32 to 36 inches wide roofing panels held in place by exposed screws / fasteners matched to the color of the panels. Caulk is used at connecting points of overlap in between the panels for water tightness. Corrugated roofing panels can also be made from galvanized, galvalume, stainless steel, and aluminum. Corrugated roofing panel does not have a lot of thickness, which makes it quite affordable, but it does require some maintenance every once in a while depending on the system. More information and system specific details covering features and benefits of corrugated roofing are provided below.
Modern day corrugated metal roofing systems offer corrosion resistance, energy efficiency and provide economical roof solution for commercial, agricultural, industrial, and sometimes residential use. Corrugated roofing panels are usually made from thin gauge steel, usually a 24, or 26 gauge steel, which makes it economical and practical, when it comes to covering large areas of roofing surfaces. Corrugated metal roofs are more practical and longer lasting than asphalt shingle roofs, and they cost much less than standing seam metal roofing.
Corrugated roofing panels can be made from aluminum, galvanized steel (G-60, or G-90 steel),
galvalume coated steel, and stainless steel. When going for a long lasting economical solution, galvalume steel provides an optimal combination of cost effectiveness and material longevity and reliability. When coated with a Kynar coating, corrugated roofing can provide significant energy savings and qualify for LEED building credits, issued by US green building council.
Corrugated Steel R panels – Green Building accredited roofing material
In commercial, agricultural, industrial, and semi residential metal roofing and wall panel material selection process, corrugated roofing panels are a real contender to be a material of choice based on two factors: inexpensive, rather long lasting and energy efficient building envelope roofing and siding alternative.
Corrugated steel roofing panel presented above is LEED certified, inexpensive roofing solution for commercial and industrial uses. It is light weight, provides solar reflectivity, and good thermal emmitance, which will help keep the building cool. The downside of using corrugated roofing systems such as 5 v crimp, R panels, and U panels, is that all corrugated roofing systems come with exposed fasteners. Standing seam, on the other hand comes with concealed roof fasteners, which offers higher degree of weather and water tightness, but standing seam a is significantly pricier metal roofing option.
As you can see in a diagram above, corrugated 36 inch R panels are installed using a 4 inch overlap at a 32 inch mark. The exposed fasteners (usually galvanized steel screws color matched to the panel, and combined with special rubber washers for water-tightness are required) are installed 12 inches on center, and then with 16 inches on center, creating a 12 and 16 inches overlap. The use of caulk at the panel connecting points is required as well, which sort of complicates the installation process, and reliance on caulk shows a major design flow of corrugated steel roofing system.
Over the years corrugated roofing systems have benefited from many aesthetic and roof integrity system specific improvements, which now makes it a considerable alternative to conventional asphalt shingle roofs that go into landfills after 15 years of service. Although metal roofing is more expensive than asphalt shingle, corrugated roofing is quite affordable compared to standing seam. There are now, many corrugated roofing systems that can be used for home re-roofing projects. However, keep in mind, that metal roofing systems with exposed fasteners may require re-tightening some every 10 years or so. Also, should you decide to invest in a corrugated roofing system, I recommend that you go with aluminum, or galvalume steel corrugated roof system coated with Kynar 500 coating, not the cheap acrylic paint finish, which will fade quickly.
Exposed fastener metal roofing for residential homes
McElroy Metal provides an affordable metal roofing alternative with exposed fasteners that can be used for residential homes.
The panel presented above, is V – 5 crimp panel, with exposed fasteners. It can actually be used for residential roof projects. V 5 Crimp roofing panel, and its installation (materials and labor) is rather affordable when compared to traditional residential metal roofing systems such as metal shingle, shakes, tiles, and standing seam roofing.