H
harkonsen19 Sep 2024 08:44Hello everyone,
We have a wooden entrance canopy that still needs to be covered and plastered.
An EPDM membrane was installed on the flat roof with no slope for waterproofing.
The drainage was positioned in a way that causes water to stand on the roof permanently.
Up to about 3cm (1.2 inches) of water can accumulate before it drains. Of course, the water disappears over time if it doesn’t rain, but it has already been standing for several days at a time.
The carpenter received working drawings for the roof from the architect, but the exact position of the drain was not defined. The carpenter said he couldn’t position the drain differently.
According to the structural engineer, we are not allowed to add a slope to the roof.
The question now is, how critical is standing water on this kind of roof?
We have a wooden entrance canopy that still needs to be covered and plastered.
An EPDM membrane was installed on the flat roof with no slope for waterproofing.
The drainage was positioned in a way that causes water to stand on the roof permanently.
Up to about 3cm (1.2 inches) of water can accumulate before it drains. Of course, the water disappears over time if it doesn’t rain, but it has already been standing for several days at a time.
The carpenter received working drawings for the roof from the architect, but the exact position of the drain was not defined. The carpenter said he couldn’t position the drain differently.
According to the structural engineer, we are not allowed to add a slope to the roof.
The question now is, how critical is standing water on this kind of roof?
S
Simon-18920 Sep 2024 10:27Hello,
the current standing water is a relatively minor issue in terms of weight. You can easily calculate that yourself. It should already be accounted for structurally, as a snow load must be considered in winter.
Gravel on the roof would only help to a limited extent, as it does not create a slope to direct the water more quickly to the drain. Without knowing the exact construction details or the technical planning, it is difficult to say anything precise.
From a construction perspective, however, there is almost always a solution if you start thinking in time. I find it very interesting that the emergency overflow is positioned lower than the regular drain. Would it be possible to swap these if the downpipe is relocated?
the current standing water is a relatively minor issue in terms of weight. You can easily calculate that yourself. It should already be accounted for structurally, as a snow load must be considered in winter.
Gravel on the roof would only help to a limited extent, as it does not create a slope to direct the water more quickly to the drain. Without knowing the exact construction details or the technical planning, it is difficult to say anything precise.
From a construction perspective, however, there is almost always a solution if you start thinking in time. I find it very interesting that the emergency overflow is positioned lower than the regular drain. Would it be possible to swap these if the downpipe is relocated?
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