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
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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