![]() To Marc Sloot in MPLS: I do not know of any testing done on the corrosion that develops on Cor-Ten. Maybe we'll see greater corrosion due to the super-saturated tule fog so prevalent there in the winter.Ī. I understand there are several in the lower central San Joquin valley (Fresno, CA) where these Cor-ten and weathering steel shake roofs have also been in place for decades. I am continuing these studies of Cor-ten and weathering steel shingle roofs and shake roofs. Other area's remaining steel thickness will probably be higher. Ice dams and wear from shedding ice and snow are like nowhere else. The local Alpine County building department requires building be engineered to take a 300# snow load. Its ten-year average snowfall is over 500". It's in the High Sierras and the roofs' elevations are around 7,000 feet. Now Kirkwood is different than a lot of places so the results may not be the same everywhere. Just as an added twist, how do we know this level of corrosion was on a straight line for thirty years? Suppose the corrosion reached this 20% level after only twenty or even ten years in place. If we assume these roofs are replaced with 20% of the roofing material remaining, and divide the corrosion by 30 (for the number of years in place), these roofs would go 122 years before replacement. Mitutoyo digital mic with accuracy to 0.00005", I found the average remaining steel thicknesses were 0.0225", corroded down from the original 0.0280".Įxtrapolating these numbers into life expectancies, follow my logic. I selected metal shakes that were along the eaves (the area with the most wear and tear on most any sloped roof), cleaned the oxide down to bare metal, and measured them. I tested these aged Cor-ten / weathering steel shakes in Kirkwood Meadows, California recently and they had 80% of their original steel intact. Northern and central California has dozens of applications dating back to the early 1970's. I am also aware of many Cor-ten / weathering steel roofs that have been installed and serviceable for over thirty years. Trapped water, overlaps, etc., will all make these prematurely fail. It appears to be common knowledge that these products, when improperly installed, do have problems. I am writing in response to your link to US Steel's caveat sheet on Cor-ten/Corten roofing and siding and the related discussions. 2018: That page appears to no longer by on line. So approach home-made rusting with caution. They offer a painted product, Cor-Ten AZP, designed to look like Cor-Ten (and they're surely not the only company offering such an approach). Steel strongly discourages the use of their Cor-Ten® rusted steel for roofing and sidingfor a number of reasons, some of which may apply to all rusted roofs. This may be fashionable, Harry, and you are welcome to do it, but per, U.S. I talked with a builder in Steamboat and he said he got his "look" by washing the factory oil off with a mild biodegradable detergent and then washed the metal with a diluted wash of muriatic acid, then left it outside for thirty days - it is really cool and looks 100 years old. Look into, they sell the raw product and can direct you to people who rust it. Steel explains that real Cor-Ten rusted steel is not recommended for roofs rather they suggest Cor-Ten AZP®, which is actually galvalume coated, then painted with PVDF to match the look of Cor-Ten. There are rusted corrugated sheets, such as Cor-Ten®, but there are also sheets that have rust-colored paints roll coated on before sale it's best to get the one that actually caught your eye. With your contacts in real estate, maybe you can get in touch with the builders of these homes and find out the actual details of what you were looking at.
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