Which of these most accurately describes proper maintenance and repair procedures in low slope roofing systems with built up roof membranes?

The statement about maintaining an area at least 18 inches beyond the perimeter of the defect for cleaning and resurfacing in built-up roofing (BUR) patching is accurate because it emphasizes the importance of a thorough approach when addressing leaks or damage. In low slope roofing systems, especially those with built-up membranes, simply applying a patch over the detected leak may not be sufficient.

Cleaning and resurfacing the area beyond the immediate defect ensure that any hidden moisture is addressed and that the new materials adhere properly. This method decreases the likelihood of future leaks and prolongs the life of the roof. It allows for a more comprehensive repair by ensuring that any potential points of failure around the perimeter of the damage are also fortified, which addresses underlying issues rather than merely the symptoms.

Patching only visible damage could leave unseen areas vulnerable, while repairs made without cleaning can fail due to poor adhesion or leftover debris. Maintaining a width of 10 feet may not be adequate for ensuring a secure repair, as this does not account for an effective overlap or the potential spread of damage.