By their very nature flat roofs do not completely drain after it rains.
Flat roof holding water.
There s a problem with flat roofs.
For clarity flat roofs actually have a slight slope to allow rain water to drain off the roof but they seem flat when compared with more traditional steeply sloped roofs.
However puddles 1 or more inches deep that linger for days can indicate a.
The design of a flat roof can sometimes prevent rain and precipitation water from draining properly making standing water a common problem.
There can be a host of reasons why ponds of water may appear on your roof after bouts of rain so it s important to know what remedial action to take if your property is suffering.
It may also void your warranty.
We have had a fibre glass flat roof installed on a new extension we ve had built.
Leaving water on a flat roof for less time can help minimize roofing damage.
Flat roofs by their very nature will collect some water when it rains.
How to fix ponding on a flat roof depends on the cause of the ponding.
A roof should not have puddles because roofs are not designed to hold the weight of a large amount of water.
This article will explain the consequences of your flat roof collecting.
In two areas there is ponding of water that doesn t seem to drain away and takes a long time to clear whereas the remainder of the roof seems to dry out quite quickly.
How to fix water puddling on a flat roof.
However excessive ponding threatens your roof.
Long term effects of ignoring ponding water on a flat roof by ignoring long term ponding water on a commercial flat roof you increase the odds of having serious roofing problems.
For a large roof it is recommended to have drains placed at multiple locations within the area of the roof.
The slope should be a minimum of 1 in 80 but in practice a minimum slope of 1 to 40 should be used to allow for deflection of the roof and for normal building tolerances.
Water does not run off of it very easily.
Leaving water on a flat roof for less time can help minimize roofing damage.
Collect dirt which may cause the growth of vegetation or telegraph mud.
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So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it.
Roof systems are simply not designed to hold water.
Even flat roofs contain a slight slope to maintain positive drainage.