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■ Application Detail 2
Aluminium Roof Outlets - Bespoke Solutions Application Detail 2
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Retrofit Harmer bespoke scupper drain installation for drainage at a parapet without disturbing the existing concrete slab
Design challenge
Need for a retro installation of parapet drainage where installing a standard two-way outlet was not feasible through fear of exposing the existing deck reinforcement.
Unique and innovative Harmer solution
A special scupper drain design with flanged connection to avoid risks associated with disturbing the existing concrete slab.
Commentary
Several special scupper drain designs were developed for different parapet drainage conditions on the same project. Each scupper drain was carefully sized to meet a required high flow rate.
All the special scupper drains were designed with a generous flange for waterproofing and non-intrusive, flush-mounted installation. This meant that the concrete slab could remain undisturbed, without scabbling, which could reduce cover on the reinforcement. The scupper drain designs also allowed for fitting of a clamping collar for the waterproof membrane, and a grate. Harmer bespoke scupper drain surface-mounted to existing parapet wall
Out-take to rainwater head
Alumasc Heritage cast aluminium circular downpipe and rectangular rainwater head
Existing warm roof
