Description of elements of the drainage system in a multi-storey building

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Installation of drainage in an apartment building
The design of internal drainage is more complex than external drainage and requires more detailed consideration.

Intra-house drainage requires individual design, since such student data are quite complex, miscalculations in this area of ​​construction threaten flooding of the upper floors of the house, overflow of water over the edge of the roof, erosion of the foundation, over-wetting of external walls, which can lead to a decrease in their strength.


SNiP regulate the number of storm drain risers on the roof of a building - at least one for every 150-200 square meters of roofing, a smaller number may not cope with the discharge of water. Several risers on the roof of a building form a drainage system.

Water intake funnels are made of either metal or plastic, and the pipes of the water discharge risers can be made of the same materials. A lattice cover protects the funnel from debris.

The funnel is located in the center of small slopes, a little away from the outer wall. In the cold season, the place where the roof and wall meet receives the least amount of heat from the heated interior spaces of the building, so the water here can freeze. The device for attaching the funnel to the roof surface must prevent water from flowing into the joint. The joint is sealed with special gaskets.

The riser pipes are provided with revisions for access by utility service personnel to clean them in case of blockage. Manholes are made in the walls of houses opposite the revisions - the plumber removes them and opens the revision.

Riser connection diagram

Siphon system and its features
The water intake funnels of the siphon system have a device that prevents the water from swirling when it gets in. Sometimes you can hear the water sucking in air.