b/s/t PVC emergency overflow RS with coating
The emergency overflow with rectangular cross-section impresses with its impact-resistant, UV-stabilised PVC. Designed for gravity drainage, available in special sizes, with welded base plate, 5 mm wall thickness and individual installation height.
Daily practice shows that emergency overflows on flat roofs often have to drain very large volumes of water.
To dissipate these volumes, a large number of round or smaller rectangular emergency overflows are required on the roof.
– b/s/t Special Construction manufactures rectangular gargoyles/emergency overflows up to 1 meter wide, which have high flow rates and can be precisely tailored in size and performance to the specific drainage requirement.
– b/s/t Special Construction also offers the advantage that the drain bodies can be manufactured not only from PVC-U, but also from PP or PE. This allows for the connection of PVC and EVA roofing membranes, as well as the welding of roofing membranes based on polyolefins or ECB.
– b/s/t Special Construction also offers the advantage that the drain bodies can be manufactured not only from PVC-U, but also from PP or PE. The standard drainage system and the emergency overflow system together must be able to drain at least the 5-minute once-in-a-century rainfall event (r(5,100)) expected at the building site.
... The minimum discharge capacity QNOT [l/s] of the emergency overflows is calculated using the following equation:
Where:
r(5,100) is the 5-minute rainfall intensity in
liters per second and hectare
(l/(s·ha)), expected once every 100 years
r(5,5) is the 5-minute rainfall intensity in
liters per second and hectare
(l/(s·ha)), expected once every 5 years
C is the runoff coefficient – dependent on
the type of roofing (mechanically
fixed, greened, gravelled, etc.)
A is the effective rainfall amount,
in square meters (m²)
Material:
PVC-U, impact-resistant, UV-stabilized
Custom construction*
Maximum inner width: 1000 mm
Minimum inner height: 60 mm
Material thickness: 5 mm
From an inner width of 500 mm
with stabilizing rib
Manufacturing-related water level of at least
15 mm
Water level 35 mm, 45 mm (or as specified) with angled base plate,
from 50 mm water level only with straight base plate (please specify when ordering)
