Flat roof drainage systems

Roofing · Built-Up Roofing (Tar and Gravel) · printed page 23 (PDF page 24)

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Book index entries

Drainage – Systems for Flat Roofing Drainage Systems Roof – Drainage Systems – Flat

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

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 at scuppers. A second roof directs water inward toward a central roof drain, identified as a potential leakage area. The third roof slopes toward an open low edge equipped with a gutter and exterior downspout. Arrows indicate the direction of roof drainage in each arrangement.

Components

flat roof parapet wall scupper drains internal roof drain gutter downspout

Defects shown

Potential leakage at scupper penetrations Potential leakage at internal roof drain

Related illustrations

0121

Flat roof drainage systems

· p. 28

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 comm

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