If your commercial building has a flat roof sometimes there is a problem with ponding water.
Rubber roof standing water.
How to fix water puddling on a flat roof.
If this is the case there is a high chance that the ponding water will stay on the roof for a long period of time causing the collection of water to become bigger.
Standing water on a flat roof add weight that will affect the structure of the roof the weight of the water pooling on a roof can cause the joists to bow and in turn cause more water to accumulate.
I have a relatively new rubber flat roof.
Ponding water is defined by the roofing industry as water that remains on the roof for longer the 48 hours after rain.
Since no nail holes result from this type of rubber roof installation there is no place for standing water to enter the roof.
By their very nature flat roofs do not completely drain after it rains.
This is especially prevalent after a lot of rainstorms.
Long term effects of ponding water on a flat roof.
However puddles 1 or more inches deep that linger for days can indicate a.
Inadequate or obstructed roof drainage.
It is is very important to correct this issue before it becomes irreversible and costly repair follows.
I notice that water pools in numerous locations about 10 20 feet from back of house.
Drains towards rear will this pooling create problems when it ices up or compromise the rubber or its seams.
The contractor swears up and down it is fine and to think of swimming pools and how they hold water year round.
This is because the flat roof can hinder drainage from rainwater which results in standing water on the roof.