Drainfast Brochure Issue 36 - Flipbook - Page 207
Rain water outlets with domed
gratings are suited to inverted roof
construction where the waterproof
membrane is located above the
roof deck but below the insulation
layer. The stainless steel gravel
guard prevents ballast entering the
drainage system during maintenance.
Gravel guards higher than 150mm
are available. (see page 212). Body
and clamp: Cast iron. Dome:
Polycarbonate. Analytical flow rate:
Litres/second based on a head of
35mm. For details of accessories
please see pages 211-215.
Note 1 - Reducing bushes can be
used on threaded outlets to convert
to 2” & 3”.
Frost roof drain domed grating with medium sump
body and threaded outlet
See Note 1
Part Number
Outlet Size
Flow Rate (l/s)
BSP 4
2.29
33.0304
£144.90
Ø349
Part Number
Outlet Size
Flow Rate (l/s)
100mm
2.29
105
6
Frost roof drain domed grating with medium sump
body and spigot outlet
150
Ø250
Ø110
33.0301
£141.72
Part Number
Outlet Size
Flow Rate (l/s)
BSP 4
2.29
117
179
4 BSP
6
Frost roof drain domed grating with medium sump
body and horizontal threaded outlet
See Note 1
150
Ø349
Ø250
93
33.0314
£202.05
action@drainfast.co.uk
207
www.drainfast.co.uk
7 FROST ROOF DRAINS
Inverted Roof Assemblies Domed Gratings
