CONNECTION TO UNDERGROUND DRAINAGE
Downpipe may be connected to the underground drainage system in
a number of ways.
| In domestic applications where the 68mm round
and 65mm square downpipes are used, they commonly discharge
through a shoe into the hopper of a gully. |
|
| Alternatively the rainwater can
discharge into a back inlet gully
through an adaptor and bend. |
|
It is possible to connect the 110mm downpipe
directly to a PVC underground drainage system:
where this is of greater diameter an adaptor can
be used. |
|
| Adaptors are also available to connect Rainwater
downpipes to underground drainage systems of
other materials. |
|
SCREWS
All fittings should be fixed with 25 x 5mm round head screws.
These should be sherardised or otherwise protected against corrosion.
Do not use nails in any circumstances.
CUTTING
Gutter and downpipe sections can be cut with
a hand saw having 6-8 teeth per cm, held at
a shallow angle, and sawing with slow steady
strokes. A file should be used to remove any swarf
or burrs. Clean all cuttings and swarf from the
gutter and downpipe ends to avoid damaged or
ineffective seals. Lubricate all seals in gutter and
downpipe fittings for ease of installation.
TESTING
When rainwater installations are complete, gutters should be tested
for watertightness under working conditions and internal downpipes
should also be tested as prescribed in the relevant Building Regulations.
Attention should be paid to the requirements of local authorities.
Guidance is also given in EN 12056 - 3. 2000
