Flat roof drainage systems

Roofing · Flat Roof Flashings · printed page 28 (PDF page 29)

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Book index entries

Flashings

Text in the illustration

leakage common at scupper
parapet wall
scupper drains
potential leakage area at drain
internal drainage system
drainage
gutter mounted at low end of roof
gutter and downspout

Generated explanation

Three building diagrams illustrate alternative flat-roof drainage arrangements. The scupper arrangement drains through openings in parapet walls, with an exterior downspout shown and a callout identifying leakage as common at the scupper. The internal drainage arrangement directs water toward a central roof drain, where a dashed outline marks a potential leakage area. The third arrangement slopes toward an open roof edge with a gutter mounted at the low end and an exterior downspout. Bold arrows indicate the direction of roof drainage.

Components

flat roof parapet wall scupper internal roof drain gutter downspout

Defects shown

Potential leakage at scupper Potential leakage at internal roof drain

Related illustrations

0088

Flat roof drainage systems

· p. 23

The illustration shows three drainage arrangements for flat or low-slope roofs. One roof drains through scuppers in parapet walls, with an exterior downspout shown at one outlet and a note identifying leakage as common a

1915

Flat roof drainage systems

· p. 345

The illustration shows three drainage arrangements for flat roofs. The scupper arrangement directs water through openings in a parapet wall, with an exterior downspout shown and a note identifying scuppers as common leak