Drainage over extension roof

[Natejack]

Is it standard building practise to run the house roof drainage onto a pitched house extension roof. As you can see from the picture, the drainage is pointed towards my velux window and it feels like it could be an issue after a few years of heavy rain. I don't see the same drainage method on my neighbours extensions

 

[cross thread]

Have you any other options

 

[noseall]

Is it standard building practise to run the house roof drainage onto a pitched house extension roof. As you can see from the picture, the drainage is pointed towards my velux window and it feels like it could be an issue after a few years of heavy rain. I don't see the same drainage method on my neighbours extensions

We'd have made provision for the main roof to drain independently - if possible. That said, there are much better places to put that down-pipe, lol.

 

[catlad]

I would have never left it there. What pitch is the roof ? look quite shallow.

 

[Notch7]

A bit ugly but the easiest option is to extend the downpipe down the pitched roof then put a bend on it so it discharges into the lower gutter

if you leave it you will end up with a patch of stained tiles.

in an ideal world the downpipe on the main roof would be got rid of and replaced with 2 either side -but to do that would require the house guttering altering as it has a fall into the running outlet...........all very difficult to do with a pitched roof in the way

 

[Natejack]

Have you any other options

Good point, I dont know. The orignal drainage came down that side of the house, but of course I didn't have an extension there

 

[Natejack]

A bit ugly but the easiest option is to extend the downpipe down the pitched roof then put a bend on it so it discharges into the lower gutter

if you leave it you will end up with a patch of stained tiles.

in an ideal world the downpipe on the main roof would be got rid of and replaced with 2 either side -but to do that would require the house guttering altering as it has a fall into the running outlet...........all very difficult to do with a pitched roof in the way

Yes, I think you're right. If all that will happen is stained tiles, I can handle that, but worried that water will somehow ingress. Will explore running the pipe down to the extension guttering

 

[ChrisJP]

The extension guttering looks to have too few brackets and is already sagging between the brackets that look to be more than a metre apart. Ideally brackets for plastic gutters should be no more than a half-metre apart, but builders rarely fit them with this short spacing.

 

[noseall]

brackets for plastic gutters should be no more than a half-metre apart

Nonsense.

800mm c/c is ideal.