Ponding water on asphalt shingles occurs when water collects and remains standing on the roof instead of draining off properly. This issue usually happens in low spots or areas with poor roof drainage caused by inadequate slope, improper installation, or blockage in the gutters and downspouts. Over time, standing water can degrade the granules and asphalt layers of the shingles, leading to curling, blistering, or even premature failure. Homeowners can do a simple visual inspection after rainfall to see if any areas are retaining water longer than 24-48 hours. Check for clogged gutters or debris on the roof that might be restricting water flow. If the ponding is slight, removing debris and improving gutter drainage can sometimes solve the problem. However, note that roof designs that encourage ponding are generally not up to code, and asphalt shingles are not designed to handle prolonged water exposure.
If you see persistent ponding and shingles showing signs of wear, it’s important to call a professional roofer who can assess the roof’s pitch, drainage system, and overall condition. Ask your roofing contractor whether the roof slope meets local building code requirements and what measures they recommend to improve drainage safely. It’s also wise to inquire about the warranty implications of any repairs since water damage or ponding can void shingle warranties if the underlying issue isn’t properly addressed. A roofer might suggest adding tapered insulation, repairing the deck, or upgrading gutters to resolve water pooling issues without compromising the roof’s integrity. By addressing ponding water early, you help extend the life of your asphalt shingles and avoid costly damage down the line.