Roof Pond Definition

In both processes the roof acts as a heat exchanging element which is cooled by evaporation on its surface longwave radiation to the sky 1 or both.

Roof pond definition.

Ponding is the unwanted pooling of water typically on a flat roof or roadway. A clogged roof drain will cause water to pond leading to increased dead load weight on building that may not be engineered to accommodate that weight. This review suggests that in some cases roof ponds can provide year round thermal comfort while reducing demand for active heating and cooling systems. Roof pond a pond of water on a roof structure that cools a building by evaporation.

Therefore they can be utilized in efforts towards the goal of carbon neutral design. The water will then sit and create a pond the longer water sits on a roof the more likely it is to cause damage over time. Because the water increases the thermal mass of the building it also increases the gain in solar energy storing the absorbed energy during the day when it is abundant for later use. Roof ponds provide cooling benefits through indirect evaporative cooling and or radiant cooling 19 22 23 24 25 26.

What causes roof ponding. So what is roof ponding. Ponding water sources other than rain. The roof pond approach brings the differing building aspects of a building roof ceiling heating and cooling system and heat distribution does away with ducts into one system.

Well it s not as fun as it sounds. In the building trades the acronym tpo stands for thermoplastic polyolefin a material originally developed for pond liners and used extensively for roofing since 1989 it s a single ply membrane made from a polymerized combination of polypropylene and ethylene propylene rubber that can be attached to a roof with adhesive or with mechanical fasteners. Flat roofs are inherently bad at draining water unlike sloped roofs. Additionally ponding water on a roof can freeze.

Ponding water accelerates the deterioration of many materials including seam adhesives in single ply roof systems steel equipment supports and particularly roofing asphalt. Leaks from cooler lines to structural issues building a flat roof can bring considerable advantages for your commercial roof primarily in providing more interior space. When drainage fails water will run to low points in a flat roof.