Moving Flat Roof Downpipe to outside

[ScottishGasMan]

I'm helping my parents redoing a room in the extension on their house. While were at it I was looking to see If its possible for me to move a downpipe that is one of 2 that drains the water from the flat roof above.

It runs down corner of room and you can hear the water running down all the time in the wet weather and it would get rid of the annoying boxing thats covering it up.

I burst the ceiling fo a look and I had though where the 90* elbow comes off of the roof I could cut the wall and just run it outside, effectivley keeping the pipe in above the ceiling then outside for the rest of its run.

But I see there is a 7inch joist running along the length and would require a 3 inch hole to accomodate this pipe. So does it look like im on a non starter? any ideas?

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[catlad]

Your best bet would be to move the running outlet to the side of the extension and put a new down pipe in.

 

[dann09]

Is the pitched roof gutter discharging onto the flat roof?

I cant see a running outlet or a down pipe from the upper roof guttering.

Neither can i see a drain inlet cover grill to indicate the exact position of the flat roof outlet.

SGM, do you have two internal drains from the flat roof - in other words, the flat roof doesnt fall to a guttering?

You could punch thro the 7" joist and the fascia, and maybe swing the outlet round, but i doubt that it would have it - given the drilling difficulties, and that it's already been "repaired".
To swing it thro the side wall might involve a new roof drain and outlet fittings.

Given that the extn. isn't that old, the roof covering is looking rippled and has ponding - maybe the two roof drains were added as afterthoughts when it was discovered that the flat roof wasn't draining to falls?

 

[joe-90]

It all looks like too much hassle for too little gain. If you were to get the downpipe to run outside - then you've got to connect that to the drain but that's under the extension. Just fill the boxing with rockwool to soundproof the trickling water and forget it.

 

[fmck]

Still room enough to put a good run on that roof. Fix some sloped runners on top of the roof, sheet in ply/osb, rubber roof membrane to give a good run to a gutter. Round about £600 top whack for a reasonably easy DIY job.

Rubber roofing is dead easy. Watch some videos on you tube and off you go.

Worked for me.

 

[maltaron]

Sounds like a good move, fmck, that roof looks a real cowboy job. A new roof on top, arris rails each side and fall to a gutter on the face. Jobs a goodun'

 

[ScottishGasMan]

Hey Guys thanks for replys.

Yea, there is two of these one at each side of extension (however the one in the utility room is in a pipe chase thats in use for other stuff so not fussed about it being there)

So there is no real slope to roof, more of a groove running from oneside to the other to encourage water to move to the drain holes in the roof.

I suspect the "repair" to the pipe has been done about 10years ago when the roof began to leak, (insurance sorted it) before I was doing any sort of DIY/Trade work.

Being that its the parents house the budget is pretty limited and I'm not overly keen on DIY roof work. Had though for the price of pipe and fittings I could move the pipe outside (and then back in underneath if required) for £50-100.


Am looking up at the fittings and it would appear its a 110mm pipe in the roof with a boss to 68mm, Imm wandering if I should get a boss to 40/50mm to run the pipe out.

Also dont know whats behind that joist, looking at the thickness of the wall and position of the joist there must be nearly 12 inch between the face of the joist and the face of the outside wood.

 

[dann09]

To determine if you could have a reasonable shot at drilling, why not ( from the fascia side ) send a 300mm v. small diameter HSS bit thru the fascia/joist(s) and see what happens?
I should imagine that it's technically doable to go thru the fascia.

As above, perhaps it's one of those jobs that require a long hard look at 5 - 10 yrs down the line, rather than bits and pieces.

 

[cotswoldbuilders]

Same as fmrc has said, plus you could change it to a warm roof construction.