Ponding Water On The Roof

All Around Roofing: Honest Roofers Denver CO

Often, homeowners look up and happen to notice ponding water on the roof. What does ponding water signify and what needs to be done about it? A Denver roofing professional can make an initial inspection of the ponding water and give a reasonable assessment of what needs to be done.

Ponding water is when water accumulates and remains on the roof longer than 48 hours. This water may come from rain, ice or melted snow. Anytime this situation occurs, it has negative effects and must be handled immediately.

The potentially most expensive and structurally threatening effect is that the ponding water may negatively affect the roof deck. Standing water is heavy. If it sits for too long or is too heavy, it increases the load on the roof deck, which can cause deck deflection. This deflection may lead to more ponding, which causes still more deflection. If there is too much deflection for too long, that sagging roof may experience a partial collapse.

Standing water during the cold months freezes into ice. Ice is a heavy load. This heavy load weighs on the roof deck and can cause deflection. Further, with the changes in daytime and nighttime temperatures, the ice may melt and refreeze over and over. This melting and refreezing wears away at the roof surface.

If it is an asphalt roof, the granules on the shingles may be damaged. These shingles, if sufficiently damaged, need to be replaced. If left unattended for too long, entire sections of roof may need to be reshingled.

Another issue may arise with the roof surface and that is the growth of unwelcome organisms and vegetation. Moisture rich environments are conducive to the growth of moss, algae and mold. The roots of these growths burrow into the shingles and weaken them. Additionally, excessive growth, especially of moss, may clog drains and cause more ponding.

Finally, if the surface of the roof is not sound, the standing water may permit moisture to seep through the roof surface. Over time, this moisture can damage the roof surface, deck and insulation. A minor repair can easily turn into a major roof reparation or restoration project.

All of this is may be avoided if the roof is properly installed. Sloping roofs must have a minimum slope of a quarter inch per foot. Properly functioning drainage systems must be in place. When building a roof or assessing ponding water, it is a good idea to call in a roofing expert to help make the best decision.

A roofing contractor from All Around roofing of Denver CO can answer any questions you have about metal roofing or flat roof systems. Ask a Question.