March 2007

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Every profession has its common mistakes. For journalists, frequent mistakes can range from commonly misspelled words to subject-verb agreement. For those in the food service industry, slip-ups include placing incorrect orders or not preparing a dish according to its recipe. And for roofing workers, mistakes can occur during roof system specification writing and system installation.

To help illustrate correct low-slope installation techniques and some common mistakes made in the field, Denver-based Johns Manville set up a photo shoot at its Rockdale, Ill., plant for Professional Roofing. Following is a selection of some roofing dos and don'ts documented by the photos taken.

For a properly installed bituminous T-joint configuration, the middle sheet needs to be cut at a 45-degree angle as shown in the photo on the left. T-patches are not necessary. Because bituminous products are thicker than single-ply membranes, cutting the middle ply helps provide a more gradual transition through the T-joint when seaming. The photo on the right shows a T-joint without a 45-degree angle, allowing for a possible void.

For EPDM membranes, T-joint seams can be made with 3- or 6-inch tape. When using 6-inch tape, making a 45-degree cut is crucial (as shown in the photo on the left). If a cut is not 45 degrees, the T-joint will move back 6 inches and may not be covered by a T-patch as illustrated in the...

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Additional photos and correct installation instructions

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