Water Ponding Test For Roof

This astm testing procedure utilizes a calibrated spray rack with specific water pressures nozzles and distances to wet a wall with water at the rate of five gallons per square foot per hour.

Water ponding test for roof.

Ponding water is defined as the water which remains on a roof 48 hours or longer. However astm d5957 specifically states the standard is not intended for use on building roofs astm d5957 references a maximum water depth of 100 mm 4 in. In this test a piece of the roof coating is used as the bottom of a cup and the amount of water that passes through this assembly is measured. Proper design installation and maintenance of roofing structures can prevent.

We apply an even layer of static pressure on the internal layer without exceeding the hydrostatic head maximum amount of water pressure that can be held without leaking or breaking of the external layer to test the integrity of the water repellant barrier. If you re lucky the drainage will be the problem since that s the easiest thing to fix. If water is pooling on your roof the first place to look is at the drainage system. First astm d6083 the governing specification for acrylic roof coating has certain minimum laboratory requirements related to ponding water.

Flood the area being tested with potable water to a minimum depth of 1 25mm to a maximum depth of 4 100mm at the low point of the test area. Astm e1105 and aama 501 2 test methods are good overall methods commonly used to test exterior walls sloped glazing and shallow pitched roofs to help identify leak sources. Start by looking for plugged drains. A ponding test is done by sealing up all drainage exits in the area and flooding the entire area with 1 3 inches of water.

The first is astm d1653 test method for water vapor transmission of organic coated films. Significance and use 5 1 this test method is a standard procedure for determining the resistance to water penetration under uniform positive static air pressure differences and simulates wind driven rain imposed on sidelaps and rain that is free to drain while building a water head as it flows. Parapet the part of the wall entirely above the roof. The slope of the roof is significant.

This translates to an added live load during testing of 101 34 kg m 2 20 76 psf. Water may accumulate on a low slope roof due to rain snow or runoff from rooftop equipment. It is commonly referenced as the standard for flood testing roof systems. Often something as simple as a clogged drain can cause serious pooling on a flat roof.

The test may be carried out for a period of 24 72 hours depending on the situation. Ponding the collection of water in shallow pools on the roof surface. The mean water depth should not exceed 2 1 2 65mm. Slope the ratio between the measures of the rise and the horizontal span.