Beach Boulevard, Katella Avenue and shared walls
Beach Boulevard and Katella Avenue are the principal routes, and the surrounding streets are busy with parked cars. Apartment buildings and small complexes often have several roofs, with shared walls, patio covers and carports attached.
Those connections matter. Where a roof meets a wall or another structure, flashing must seal the joint, and age or building movement can open it. Flat and low-slope sections are common on additions, awnings and commercial units. Heat wears sealants, and rain, though infrequent, finds any gap quickly. Dust and debris build up on low roofs near busy streets.
