When it comes to maintaining commercial and multi-unit residential buildings, water intrusion is one of the most common — and costly — issues building owners face. While roof leaks are often blamed on obvious wear and tear, sometimes the root of the problem lies in a subtle construction oversight that can go unnoticed for years.

One such issue involves stucco application and its relationship with coping caps. At RoofSmith, we frequently see cases where stucco is applied too low on a parapet wall, preventing coping caps from fully covering and sealing the top edge. This small but critical error leaves the structure vulnerable to water penetration, especially during heavy rain or freeze-thaw cycles.

Recently, RoofSmith was called in to address a leak that had become a recurring nightmare for a building owner. Despite multiple repair attempts by various contractors, the leak persisted. Our team conducted a comprehensive inspection, including a targeted water test, to trace the source of the problem. What we discovered was exactly what we’ve seen in many other cases: the stucco did not extend high enough for the coping caps to create a proper watertight seal.

To resolve the issue once and for all, RoofSmith removed the existing coping caps, replaced sections of damaged wood underneath, installed a high-temperature underlayment for added protection, and installed a new section of coping cap with the proper coverage and sealing. This not only stopped the leak but also reinforced the building envelope to prevent future water intrusion.

Key Takeaway for Building Owners

Water leaks are often a symptom of a deeper construction flaw. Building owners should be aware that even small details — like the height at which stucco is applied — can have a significant impact on the longevity and performance of their roofing and waterproofing systems. Regular inspections by experienced professionals and proper detailing during construction or repairs can save thousands in long-term damage and liability.

If your building is experiencing persistent leaks, don’t settle for patchwork repairs. Contact a knowledgeable roofing and waterproofing contractor who will dig deeper to find the root cause — and fix it right the first time.