Hello everyone,
We are currently having a single-family house built and have two small flat roofs. After some rain, I noticed that water remained on the flat roofs, as seen in the photos.
My father-in-law is a civil engineer and said that this should not be the case.
Our construction manager said it depends on the height of the standing water. He wanted to take a look himself but apparently hasn't had time in the last two weeks. :\
From the pictures and in person, it seems like the roofs slope slightly uphill towards the drains, which would mean that a bit of water stays there permanently during the rainy months. It doesn’t dry off quickly either. :\
This sounds a bit worrying to me...
How do you see this? Is there any guidance or standards to rely on? I only found a recommendation of 2% slope.
Thanks and best regards 🙂
We are currently having a single-family house built and have two small flat roofs. After some rain, I noticed that water remained on the flat roofs, as seen in the photos.
My father-in-law is a civil engineer and said that this should not be the case.
Our construction manager said it depends on the height of the standing water. He wanted to take a look himself but apparently hasn't had time in the last two weeks. :\
From the pictures and in person, it seems like the roofs slope slightly uphill towards the drains, which would mean that a bit of water stays there permanently during the rainy months. It doesn’t dry off quickly either. :\
This sounds a bit worrying to me...
How do you see this? Is there any guidance or standards to rely on? I only found a recommendation of 2% slope.
Thanks and best regards 🙂
BertTheNerd schrieb:
Hmm... how does the roof warranty work if I green the roof myself? If water leaks through after 3 years due to a construction defect, won’t they just dismiss my claim? 🙄We’re not in the 70s anymore; the biggest threat to your roof is no longer leakage itself, but UV radiation, which unfortunately damages and makes the membrane brittle over a relatively short time, eventually causing leaks.
Before our build, we consulted many professionals who all agreed: the main thing is to have some kind of covering, even if it’s just gravel. Green roofing is better because it retains some moisture. But nothing is not an option.
The main roof was installed by the general contractor, while I did the small bay window roof myself, which is definitely feasible and doesn’t involve significant costs.
But do as you please—just a bit of advice from the forum...
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BertTheNerd24 Oct 2022 21:00As an addition, I finally dared to climb onto the roof and measured 2.5cm (1 inch) of standing water. Unfortunately, I forgot the spirit level :\
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WilderSueden24 Oct 2022 21:18You have a really large spirit level placed on the roof, right? 😉
I think 2.5cm (1 inch) is way too much. Where is the slope towards the drain?
I think 2.5cm (1 inch) is way too much. Where is the slope towards the drain?
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