Ponding On Roof Plan

On shingle roofs most building codes require a minimum slope of 4 12 with an underlayment of one layer of 15 pound roofing felt.

Ponding on roof plan.

When the water is unable to drain it accrues in little ponds in the low points of the roof. So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it. Ponding is the unwanted pooling of water typically on a flat roof or roadway. If there is ponding water on your flat roof it may also affect adhesion.

However excessive ponding threatens your roof. Flat roofs by their very nature will collect some water when it rains. Materials such as the roofing material vents and their location and the type of underlayment are also typically specified on the roof plan as seen in figure 20 3. This type of occurrence is called ponding water and typically occurs due to the settling of a building which creates an unlevel surface.

A scale of 1 8 1 0. Roof plans a roof plan is used to show the shape of the roof. Many homeowners now prefer using silicon coating for their flat roofs because of its appealing aesthetics and solid protection from leaks. In dutch building practice the most frequently occurring damage cases are failures of flat roof structures caused by ponding of rainwater.

Ponding of rainwater is a special load case that can lead to roof collapse. Because these roofs don t drain water that well they are prone to developing what is known as ponding water. How to fix ponding on a flat roof depends on the cause of the ponding. To specifically define the terms ponding or standing water refers to when water has not drained off the roof and has formed puddles or ponds 48 hours following the reason for the water.

If the water does not drain within a 48 hour period it is highly likely that it will stay even longer and there will be a larger amount of water standing. In the dutch code for loadings and deformations nen6702 1 and. Those pitched roofs have a natural slope where the water can run down draining off the roof. As the angle of the roof is increased the size of the overhang may need to be decreased so that the eave will not extend into the line of sight from the window.

It may also void your warranty. Raffles place mrt station has seen its fair share of unnatural disasters from the raining incident in 2017 to when train cabins were recently filled with smoke due to a leaking air conditioning compressor. On many commercial flat roofs water doesn t properly drain off of the building. Silicone coatings won t chip away over time.

Ponding water is known in the roofing community as water that stands in a puddle on the roof for more than 48 hours at a time. It s one of the best coatings to withstand ponding water permanently. Raffles place mrt sees water leaking from roof on north south line platform.