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 — nothing here is separate from what's on the product and standards pages.

Standards

What EN 1433 and EN 1253 actually require, and where WTI's range sits within them.

5 min read

EN 1433 Load Classes, Explained

What A15, B125 and C250 actually mean, and how to read the rest of the standard's scope.

4 min read

EN 1253 and Indoor Floor Drainage

The standard behind WTI's stainless steel shower channels and point drains, and what it means for a wet room spec.

Materials

The material science behind the range, stated in terms of what it changes on site.

5 min read

Polymer Concrete vs Precast Concrete Channels

The material difference behind the exterior range, and why it changes how a channel performs over time.

Specification

How to choose between siblings in the same line for a specific project.

4 min read

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 read

Linear 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 read

How Balcony Drainage Slope Actually Works

Why the fall lives in the channel, not the screed — and what that means for a flush tile finish.