Every homeowner and roofer recognizes the fact that water forming up on the roof can seep down and affect the internal frames. The gutters are also a culprit as any blockages will redirect the water into the foundation and the frames. Take note that the roof design may create chances for ponding even in a sloped roof because some sections actually dip; this can expose the affected area to further UV-triggered discoloration. The authors state that if you’re opting for a roof replacement, mark the ponding areas in the existing roof and factor the solutions into the final design.
Knowing the environmental conditions and the potential loading on your roof will be critical to the long-term survival of the roofing system. Have a contractor who knows residential roofing in Menlo Park, CA work it out with you.