Drainage options for flat roof extension

Question

What sort of drainage systems can you get for flat roofs? We're thinking of a flat-roof extension but I don't know what the best option is to keep it draining well.

Harry · Answer

Scuppers are the most effective drainage solution for flat roofs. With this system, large square openings are made along the edge of the roof that shoot the water away from the side of the building.

Wesley · Answer

You can either install a box gutter to ensure water doesn’t sit on flat roof 
Or put a good fall on to dispel water sufficiently

Jason · Answer

Hi there Joyce if you’re having a flat roof as long as you got the run right you can put normal gutter on mak sure you put drip trays in

Rob · Answer

Good evening regarding new extension that you are building with the Flat Roof!! The builder that wins the contract with you will know he has to put furring pieces onto the new joists before the roof is played by doing this will allow the water to come off the flat roof into the new gutter if you need any more advice please feel free to contact me. Rob ARSW Roofing Wales

Nathan · Answer

Rubber and we can put drainage Channel in it fibreglass is another good option but as long as it has good drainage felt ok as well

John · Answer

Scuppers drainage are the most effective drainage solution for flat roofs.
Either extended ones that stick out from the roof so the water does not come in contact with the walls or ones that go into a hopper and then down the down pipe and into a drain.

Ryan · Answer

It would depend on what pitch and angle the roof is at, but could be easily done by putting gutters on to a fascia into a downpipe then install a drainage system like a soak below the downpipe and connect to the nearest drain.

Peter · Answer

Slight  tilt  to  roof area which can take extra water running .Either thator simplyrun to trough gutter at junction of flat roofaa won't main pitched roof. .Personal view is to geta pitched roof if possible on extension. Troughgutter isgood but has to be done right

Kevin · Answer

Any professional roofer would put a pitch on the roof and attach guttering. 
It’s the most common way but some contractors prefer to use box gutters. Depends how much the contractor wants to earn.

Malcolm · Answer

When the flat roof timbered are fitted , you then have to fit furings which are wedge shaped timbers which go from the wall of the existing house to the rear of the extension. They are wedg shaped and normaly taper from 100mm to nothing. This will be plenty of fall fall the rainwater to run of into the gutter
Kind regards
Mal

Drainage options for flat roof extension

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