Roof Pond Meaning

When drainage fails water will run to low points in a flat roof.

Roof pond meaning.

Ponding water accelerates the deterioration of many materials including seam adhesives in single ply roof systems steel equipment supports and particularly roofing asphalt. Roof ponds are an example of this strategy. Roof ponds with wet gunny bags shaded roof ponds ventilated roof ponds and roof ponds with movable insulation proved to be more effective relative to other variants of roof pond cooling systems. 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.

Comparing performance relative to other passive strategies showed that in many cases roof pond cooling systems are about equally effective in maintaining indoor thermal comfort. What causes roof ponding. Roof ponds provide cooling benefits through indirect evaporative cooling and or radiant cooling 19 22 23 24 25 26. There are various designs and configurations for the roof pond system but the concept is the same for all designs.

Ponding is the unwanted pooling of water typically on a flat roof or roadway. Debris blocked the culvert and the. Well it s not as fun as it sounds. So what is roof ponding.

Roof pond a pond of water on a roof structure that cools a building by evaporation. A still body of water smaller than a lake. 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. Flat roofs are inherently bad at draining water unlike sloped roofs.

On low slope asphalt roofs ponding water allows the oil solvent components of the asphalt to leach out and evaporate leaving the roof membrane brittle and susceptible to cracking and leaking in the ponding location. 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. The roof pond design became popular with the development of the sky thermal system designed by harold hay in 1977.