ᐅ Roof drainage into the gutter or over a drip edge

Created on: 23 Feb 2024 19:54
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Spiderman1982
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Spiderman1982
23 Feb 2024 19:54
We have a shallow 23-degree pitched roof with drainage via an eaves flashing. This means the underlay drains over the eaves flashing and everything flows over the roof tiles into the gutter. It is a cold roof.

1. How problematic is this if a photovoltaic system is installed later? Water that gets onto the underlay through the connections or roof tiles.
2. How problematic is this for the façade, since the water drips off uncontrollably? Condensation and moisture buildup, as well as snow loads in winter that pass through the roof tiles and get blown onto the façade by the wind. (2 full floors)
3. Are there any negative experiences regarding a terrace—meaning water frequently running off the eaves flashing onto the façade?
4. Should drainage generally go into the gutter starting from a certain roof size, since more water naturally accumulates?
5. Am I worrying too much?

The roof tile used has a standard roof pitch of 22 degrees.

Does the eaves flashing need to be explicitly listed in the construction and scope of work description? The general contractor just did it this way, and I would have preferred to be consulted beforehand.
11ant24 Feb 2024 12:41
Spiderman1982 schrieb:

Does the drip edge have to be explicitly listed in the scope of work and specifications? The general contractor just installed it without informing me, and I would have preferred to be asked beforehand.

We discussed this topic recently, see here:
https://www.hausbau-forum.de/threads/ist-ein-traufblech-zwingend-vorgeschrieben.46839/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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Spiderman1982
24 Feb 2024 13:03
11ant schrieb:

We have already discussed this topic recently, see here:
https://www.hausbau-forum.de/threads/ist-ein-traufblech-zwingend-vorgeschrieben.46839/

Yes, I have read the post.

The issue concerns the problems that arise with drainage using a drip edge and, if it is not specified in the scope of work, whether drainage should then necessarily be routed through the gutter during house construction.
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Spiderman1982
25 Feb 2024 20:55
If it is expected that large amounts of rainwater will need to be drained below the planned roof drainage system, the additional waterproofing measure must be drained directly into the gutter.

Are there regulations specifying when drainage into the gutter is mandatory? In other words, when can large quantities of rainwater be expected? For example, factors such as roof size, location of the house/weather conditions in the area, or specifications from the architect.
11ant26 Feb 2024 13:52
Spiderman1982 schrieb:

Is the additional rainproofing measure required to drain directly into the gutter?"
I can’t even follow the language used for how a measure should be drained. Apparently, the beers didn’t wait until after the town council meeting.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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Spiderman1982
26 Feb 2024 14:55
11ant schrieb:

I can’t even follow the language on how a drainage measure should be done. Apparently, they didn’t wait until after the local council meeting before having some beers.

The underlay membrane (USB) is a special additional measure to ensure water tightness beneath roof coverings. Clear now?