Drain pipe going to nowhere on a flat roof

[booms]

Hi there,

Just bought a new place with a roof terrace on a flat roof. Seems our vendors managed to hide the fact that there's a drain pipe that simply empties out onto the roof with some artfully placed plant pots.

It looks like below:


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The water is pooling up - where it coming out another 3 foot along there's an incline down to drainage - but it's not working here.

I wondered if it would make sense to basically run a hose directly off the drainpipe to the area where it would be able to drain; but I haven't been able to find anything that would do this.

If there a product that would work for this, and does it make sense? There's not too much room on the terrace, so I don't want to eat up space with too big a solution - just make sure the water goes where it needs to.

 

[Nige F]

that`s a white plastic overflow pipe - from something - sticking out the wall - and there are bumps in the mastic asphalt of the roof causing the pooling Also there is a bush growing out of the brickwork - kill it Unless it`s on next doors patio in a pot. See if you can find where the white pipe runs to inside . Then report back

 

[booms]

I probably should have said everything on this level belongs to our upstairs neighbour - except for our terrace - so not sure what the overflow is coming from.

Any way - the drainpipe is definitely the main problem for now - any ideas on a product to deal with that?

 

[^woody^]

You and lie some square-flow gutter on your roof to channel most to the water from this downpipe to your outlet

 

[cotswoldbuilders]

Why use square line gutter, when existing is round ?

 

[^woody^]

Because square-flow has a flat bottom and will rest on the roof, when half-round will tip sideways

 

[booms]

I'm trying to keep this all as compact as possible - we don't have much room.

Would it be possible to connect the existing drainpipe (68mm I think) to a section of hose pipe and run that the 8 foot down to where the incline on the roof works?

I've tried to find some waterproof connectors/convertors that would do this - any recommendations?

 

[Alastairreid]

Reducing the size of the bore of the rwp will make it more prone to blockages and may cause it to back up and overflow during heavy spells of rain.

 

[colsey25]

what about a water butt with a 21mm overflow into a drain??