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 🙂
B
BertTheNerd17 Oct 2022 13:14guckuck2 schrieb:
How was the slope executed in the first place? Slope insulation, screed? Is there only one drain, meaning the slope would have to go entirely from left to right, or are there other drainage points as well?I don’t know anything about the execution. There is only the one drain plus the emergency drain next to it. Offtopic schrieb:
If greenery is added later, it won’t be a problem at all.
[...]
And in one of the pictures it looks like the membranes are not fully glued down and already have air bubbles by the parapet? No greenery. Oh, I hadn’t even noticed the air bubbles :\ WilderSueden schrieb:
How high is the water standing? Put a measuring rod in and take a picture.
To me it also looks like the slope goes uphill towards the drain, and that is definitely a defect. And what slope was planned for the roof? I don’t know if or how the slope was planned. I can’t see anything about it in the section plan. I’d have to crawl up there to measure with a rod... oof, I’m a bit hesitant about that. guckuck2 schrieb:
Just a theory, of course, but drains often need to be adjusted to the builder’s wishes regarding glazing and downpipes that are not routed over the glazing ;-).
We can guess what the bay window looks like from below/outside… I’d guess a lot of glass, and the covering on top of the structure also supports that. At the front below the flat roofs there are windows, but on the side where the drain is, there are none. Steffi33 schrieb:
For now, I would simply put a thick absorbent cord in the water (one end weighted with a stone). The other end goes into the drain hole. The cord absorbs the water and lets it drip into the outlet… that’s the theory… worth a try. Sounds good 🙂 You could maybe sprinkle some sand or something on it if necessary, so the water is absorbed and doesn’t keep finding a way down into the house? Thank you all very much
W
WilderSueden17 Oct 2022 13:45BertTheNerd schrieb:
I don’t know if or how the slope is planned. I can’t really see anything from the drawings. I’d have to crawl on it with a meter stick… uh-oh… I’m kind of worried about that. Don’t worry, the roof should support you. Otherwise, you’ll have much bigger problems in the first real winter 😉
Ask your architect or the person who did the detailed construction plans about the slope.
BertTheNerd schrieb:
Without greenery.I would absolutely and strongly reconsider that. Without greenery, UV exposure will be your biggest enemy... You can do this yourself, it's not complicated, and it will help you immensely.
BertTheNerd schrieb:
Without greenery.Nemesis schrieb:
...that can also be done as a DIY project,Greenery is great, all done by myself.Before:
After:
B
BertTheNerd18 Oct 2022 08:05Hmm... how does the roof warranty work if I plant vegetation on it myself? If water leaks through after three years due to a construction defect, won’t they just refuse to cover it? 🙄
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