Test For Materials For Ponding Water On Roofs

Water may accumulate on a low slope roof due to rain snow or runoff from rooftop equipment.

Test for materials for ponding water on roofs.

Flat roofs by their very nature will collect some water when it rains. The water was sitting on top of the insulation board and started leaking in the building causing extensive damage. On modern white roofs the water focuses the sunlight that passes through it like a prism and intensifies uv degradation. Best ponding water roof coating.

So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it. This is a particular concern for older built up and modified roofs. This tpo roof actually disintegrated in ponding water. Their main drawback however is that acrylic polymers re emulsify in water consequently limiting their operability on roofs with ponding water.

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. It is commonly referenced as the standard for flood testing roof systems. Ponding water can have major negative consequences regardless of the type of roofing system. How to fix ponding on a flat roof depends on the cause of the ponding.

Due to the deformation extra rainwater flows to the lower area of the roof resulting in a larger. 1 introduction rainwater ponding occurs by deformation of flat roofs caused by rainwater. The uv stabilizers gone weathering package layer gone the polypropylene ep rubber gone all that was left was the polyester reinforcement. Most acrylic roof systems involve the application of multiple layers of coating with fabric reinforcement which unfortunately lengthen the project.

Proper design installation and maintenance of roofing structures can prevent. It may also void your warranty. Roofing materials referencing this standard. Ponding water is defined as the water which remains on a roof 48 hours or longer.

This translates to an added live load during testing of 101 34 kg m 2 20 76 psf. Watch this 37 second video. However excessive ponding threatens your roof. One of the biggest problems with large flat roofs is that they tend to pond water in certain areas.

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. Ponding rainwater roof collapse construction sensitivity analysis safety design calculation structural behaviour. Spray testing spray testing is the use of controlled water flow deposited on building components in a manner that simulates normal to severe weather conditions. Degrading the roofing material itself.

5 6 this guide is not recommended to be used if freezing temperatures are expected to occur during the test period.