Which of these is a frequent installation mistake on modified bitumen roofing?

End seams not staggered is indeed a frequent installation mistake with modified bitumen roofing. Proper installation of modified bitumen involves overlapping sheets, and it’s crucial to stagger the end seams to promote effective waterproofing. When the seams are not staggered, there is an increased risk of water infiltration at the joints, which can compromise the integrity of the roof over time. Staggering the seams helps distribute stress along the roofing material and prevents alignment of potential weak points, making the roof more resilient to environmental conditions.

Other issues, such as inadequate fastening or the use of weak adhesives, can also lead to problems, but they might not be as common as the specific installation mistake of aligning the end seams. Incorrect material usage would likely stem from a more fundamental error at the onset of a project rather than a subtle installation oversight. Understanding the emphasis on staggering seams is critical for those involved in the installation and maintenance of modified bitumen roofing.