A rainwater downpipe is a pipe that is used to direct rainwater away from a building typically from roof guttering to a drainage system.
Roof rain water down pipe.
The down pipe can terminate in a shoe and discharge directly onto the surface but using modern construction techniques would be connected through an inspection chamber to a drain that led to a surface water drain or soakaway.
Rainwater calculations on face value guttering installation is a piece of cake but it is amazing how many installers get it wrong.
This is where the rainwater is lead away from the building s foundation so that no rainwater is able to pool around the building.
Pvc roof outlets are most commonly used in conjunction with flat roofs that are manufactured from synthetic membranes whilst tpe roof outlets are used in conjunction with flat roofs made from fibreglass and bitumen.
Calculating effective roof areas where gutter angles are installed.
Besstem upvc pipe fitting rainwater downpipe system bs en 12200 1 2000 besstem upvc pipe and fittings rainwater downpipes are generally manufactured from unplastized polyvinyl chloride pvc u.
Downspouts are drainage pipes that direct rain water from the roof to the ground.
This size of downpipe has been selected as it has the necessary capacity to accommodate the maximum flow from any.
Roof rain water outlets rwo s are much smaller and seem to have a greater resistance to the flow.
Scuppers are open holes or channels cut into the roof edge or parapet.
It is sometimes also referred to as a downspout drain spout roof drain pipe or leader.
Rainwater pipe sizes with the exception of the deepflow150 gutter system which has an 82mm diameter downpipe all other marley pvcu gutter systems incorporate outlets suitable for 68mm circular or 65mm square rainwater pipes.
Water collected by a rain gutter is fed usually via a downpipe also called a leader or conductor from the roof edge to the base of the building where it is either discharged or collected.
Downpipe fittings and connectors are used to join sections of downpipe together or to connect them to other parts of the guttering system they form waterproof and durable seals ensuring that rainwater is effectively drained away.
A scupper may drain into a downspout on the exterior of the building or it may have an extended chute or pipe that directs a stream of water away from the building.
The formula in qudm is designed for field inlets and not roof outlets.
This can be calculated by using the following formula see diagram below.
The roof is sloped toward the scuppers and water simply drains out through the scuppers.
Ring seals are epdm and natural rubber complying with the requirements of bs 2494 1976.
