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Types of corrugated roof coverings:
Here is a photo guide and text that can assist in identification and evaluation of the condition of corrugated roofing products. We describe fiber cement corrugated roofing panels, cement-asbestos corrugated roof panels, Duralita cardboard-cement roof panels, corrugated fiberglass roof panels, and corrugated metal roofing.
Asbestos cement roof shingles were in popular use in the U.S. from the 1920's (est) through the 1960's (est) and were sold in the U.S. into the 1970's and according to some sources even in the 1980's.
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The mixture of asbestos fibers and portland cement to form a hard material that was was durable and fire resistant is credited to Ludwig Hatschek who, in 1900, came up with the name Eternit associated with a U.S. producer of these products.
The typical life expectancy of an cement asbestos shingle roof was given as 30 years, But we have seen these roofs that were now 50 years old in good condition. Typical roof wear or failure patterns are either failure of the shingle fasteners or broken and falling shingles.
Virtually all of the inspection points, installation limitations, and environmental concerns which we discussed at Guide to Cement-asbestos roof shingles also apply to corrugated asbestos-cement roofing products.
OPINION: The lichens growing on cement-asbestos roofing (photo at left), especially this thick corrugated material, is probably less of a wear concern than when that material appears on asphalt shingles or roll roofing.
Do not try to walk on this material without taking the same precautions as if accessing a slate roof: the material is easily damaged by foot traffic.
See Corrugated Cement-Asbestos Roofing for details about this material, and about demolition or repair of corrugated cement asbestos roofs as well as for sources of non-asbestos replacement fiber-cement corrugated roofing products.
Corrugated Fiber Cement Roofing
Contemporary roofing product manufacturers make reinforced fiber-cement roofing shingles and other roofing products which look like, perform similarly to, and need to be installed similarly to the original corrugated asbestos-cement sheet roofing - but these new products are free of asbestos. (Photo at left: author points to new fiber cement roofing product.)
As we explained in our discussion of cement asbestos shingles, the replacements for corrugated asbestos cement roofing products are reinforced with a variety of fibers including fiberglass.
Other replacements for asbestos-cement roofing use both different fibers and a different aggregate (perlite) to replace the asbestos. Some of the substitute products have been in use for more than 30 years (2008).
For maintenance or replacement of asbestos-cement roofing products contact Supradur Manufacturing Corporation, PO Box 908, Rye NY 10580 800-223-1948, or from within New York State, call 914-967-8230. Ask about their Supradur(R) mineral fiber shingles.
For handling and disposal guidance concerning old roofing material contact the US EPA, your state Department of Environmental Protection/Conservation, or your local building and health departments.
Duralita, an alternative to both clay roofing tiles as well as other fiber reinforced cement roofing products is produced in El Salvador and used widely throughout central america and north America. Duralita is a series of brightly-colored cardboard-reinforced cement corrugated roofing products produced by the Duralita, manufacturer of the same name. From the ground Duralita resembles clay roofing tiles.
Panels of Duralita are secured using fiber or rubber washers and threaded rods or bolts. Duralita tejalitas are sheets of reinforced concrete that are intended to resemble roof tiles.
Corrugated cardboard cement products of the same composition, Lámina, are sold in sheets of various sizes and similar colors. You can see an installation of Duralita at the Posada del Bosque Encantado, a hotel operated by our acquaintance Terry Rubin who was kind enough to inform us about this product.
Corrugated fiberglass roof panels are installed where light is a premium, as shown in this porch constructed by the author in 1983. As we drove out of HG Page lumber with our corrugated fiberglass roof panels, one blew off in the parking lot.
Dashing out to try and rescue our panel, the new fiberglass roof panel was immediately driven over by a heavy lumber delivery truck. We were stunned to see that the panel had survived the accident with no visible damage, so we installed it on the roof shown in our photos.
The next day when bright sun shone on the roof, our client called to ask why there was a perfect imprint of a truck tire across her roof.
Above we illustrate a new translucent fiberglass roof panel during installation (not work performed by the author) after an older installation on the same roof leaked due to poor flashing.
Corrugated panels, like clay tiles, sport an irregular surface that requires use of flashing products that fit the panel surface in order to avoid leaks.
Corrugated Metal Roofing Panels
The patched corrugated metal roofing shown below (left) covers a pre-1900 home currently used as a parsonage in Dover Plains, NY. The modern corrugated roofing shown at right tops a gambrel-roofed barn in New England.
Corrugated metal roofing on very old buildings such as this pre-1900 home in Pawling, NY, may be patched with newer corrugated sections where a chimney has been abandoned. (See Abandoned Chimneys: Outdoors).
Corrugated metal roof panels are sold in both aluminum and steel.
Watch for wind damage, especially where a simple nail-over panel has been installed such as shown here.
Corrugated metal roofing on very old buildings such as this warehouse in Hudson, NY, may be stunningly rusted and yet not leaky.
Corrugated metal roof panels are sold in both aluminum and steel.
The damage at the lower left roof corner was from a truck at the loading dock.
Also see the metal roofing articles listed in the ARTICLE INDEX given at More Reading below,
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Duralita: produces cement & cardboard corrugated and clay tile-like roofing products: Duralita is a combination of cement and cardboard - see www.duralita.com/ Si tiene alguna pregunta, por favor escribanos a: email@example.com -
El Salvador: +503 188.8.131.52 ext.31 USA +1 305.677.3597
 Follansbee Roofing, Follansbee WV 26037, Tel: 800-624-6906, website: www.follansbeeroofing.com and http://www.follansbeeroofing.com/products/TerneII.aspx Quoting Follansbee on TerneII properties:
Follansbee Steel is the only manufacturer of a pre-painted or natural Terne roof and is a leading supplier of metal roofs for new and retrofit commercial, institutional, residential and historic preservation projects.
Metal Roofing Alliance, E. 4142 Hwy 302, Belfair, WA 98528, Telephone:(360) 275-6164, Customer Support 410-534-6900, Email: firstname.lastname@example.org,
Website: www.metalroofing.com. Quoting:
The Metal Roofing Alliance was formed in 1998 by a small group of forward-thinking metal roofing manufacturers with the main goal of educating consumers about the many benefits of metal roofing. Since our inception, we've shown millions of people just how beautiful, durable and money-saving metal roofing can be for them. Over the years, our membership has grown to include paint companies, material suppliers, industry publications and more. Be sure to take advantage of all of the great resources our members offer.
The Metal Initiative, 4700 W. Lake Ave., Glenview, IL 60025, P:847.375.4785 Website: www.themetalinitiative.com/, Email: Louise Ristau email@example.com Quoting:
The Metal Initiative is a coalition of manufacturers, individuals and associations that have come together to provide information on the features and benefits of metal in construction. Carrying its message of metal primarily to the professional building owner community, The Metal Initiative seeks to gather and disseminate useful information for decision-makers.
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: firstname.lastname@example.org. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
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