PRODUCTS
Exterior Drainage - Polymer Concrete
Polymer concrete channel drains for driveways and residential compounds, landscapes and pool surrounds, pedestrian plazas, parking areas and basement ramps, commercial and institutional campuses, and kerbside or road-edge drainage. One channel body, four grate variants, load class A15 to E600.
Spec baseline
| Material | Polymer Concrete |
|---|---|
| Standard | EN 1433 |
| Length | 1000mm |
| Size options | 55×100, 100×100, 150×150, 200×200, 300×300mm |
| Load class | A15, B125, C250, D400, E600 |
| Water absorption | Negligible |
| Grating material | Stainless Steel or Ductile Cast Iron |
Why polymer concrete?
Higher compressive strength than precast, negligible water absorption, and no corrosion path through the body. The channel occupies less of the build-up for the same duty.
High compressive strength
Carries wheel loading without the wall thickness a precast concrete channel needs for the same duty, so the channel occupies less of the build-up.
No ferrous corrosion path
The polymer concrete body does not rust or bleed into surrounding paving at the grating seat the way a corroded steel channel can.
Chemical resistance
Withstands de-icing salts, fuel spill and industrial wash-down chemicals without surface attack.
Negligible water absorption
The channel body does not take up water, so there is no freeze-thaw spalling at the exposed edge.
Durable construction
Fewer channel replacements across the asset's life, which is where lifecycle cost is actually decided.
Load class
EN 1433 classifies channels from A15 to F900. WTI's exterior polymer concrete range is published A15, B125, C250, D400 and E600.
Selected class
C250
250 kN · Heavier vehicular
Kerbside and road-edge runs, basement ramps and service yards carrying heavier commercial traffic.
Published range
| A15 | Pedestrian areas |
|---|---|
| B125 | Light vehicular |
| C250 | Heavier vehicular |
| D400 | Carriageways |
| E600 | Industrial / high wheel loads |
Where it's specified
Application environments where WTI exterior channels are typically specified.
- Driveways & residential compounds
Light vehicle entry and turning where a discreet drain line matters.
- Parking structures & basement ramps
Repeated wheel loading plus chemical exposure from fuel and oil.
- Pedestrian plazas & landscaped areas
Foot traffic only, where sightline outweighs load capacity.
- Road-edge & kerbside
Carriageway interception under heavier commercial traffic.
- Service yards
Slope drainage with turning traffic and wash-down loads.
The range
SS Single Slot
Residential driveways, pool surrounds, and pedestrian plazas where a discreet drain line matters more than maximum flow capacity.
SS Double Slot
Parking areas, basement ramps, and commercial or institutional campuses where surface water volumes are higher and a single narrow slot would undersize the inlet.
SS Trianglo Slot
Landscaped courtyards, pool decks, and entrance plazas where the drain run is visible and expected to look considered - not just functional.
Ductile Iron
Kerbside and road-edge drainage, parking areas and basement ramps carrying vehicular traffic, and commercial or institutional campuses where the grate needs to withstand repeated wheel loading.