KNOWLEDGE
Knowledge Centre
Technical guides written for the people specifying WTI, not for search engines. Every guide is drawn from the specifications already published across the site.
Standards
What EN 1433 and EN 1253 actually require, and where WTI's range sits within them.
Materials
The material science behind the range, stated in terms of what it changes on site.
Polymer Concrete vs Precast Concrete Channels
The material difference behind the exterior range, and why it changes how a channel performs over time.
4 min readWater Absorption and Freeze-Thaw Performance
Why negligible absorption matters in exterior channels, and what happens to cement-bound channels in cold climates.
Specification
How to choose between siblings in the same line for a specific project.
Choosing an Exterior Grate: Single Slot, Double Slot, Trianglo or Ductile Iron
Same channel body, four grate options - here's how to pick between them.
4 min readLinear vs Point Drains for Indoor Wet Areas
When a continuous channel earns its footprint, and when a compact point drain does the job.
3 min readHow Balcony Drainage Slope Actually Works
Why the fall lives in the channel, not the screed - and what that means for a flush tile finish.
5 min readSpecifying Drainage for Parking Structures
Load class selection for basement ramps vs rooftop parking, turning traffic multipliers, and polymer concrete's advantage under chemical exposure.
4 min readGrate Pattern and Hydraulic Intake Area
How slot width and pattern affect intake capacity, and when a ductile iron grate outperforms a narrow stainless slot.
Installation
Practical guidance for getting the channel into the floor correctly.