Tape Over the Fine Line: Marking Shower-Base Cuts That Reassemble Perfectly

The Problem

A sloped shower base with envelope cuts — the diagonal cuts that let a flat tile fold around the slope to the drain — lives or dies on whether the cut pieces go back together in line. A marker line alone is easy to lose against glaze under a wet saw's water and glare, and a cut that wanders a blade's width at each intersection reads as a crooked drain from above.

The Technique

A tiler's marking system for precision base cuts:

1. Mark with the finest liner you have. The thinner the line on the glaze, the more precise the layout — a fat marker line is itself a few blade-widths of ambiguity.
2. Lay delicate-surface painter's tape along the line. Its crisp edge follows your fine line exactly and turns it into something you can actually see at the saw.
3. Slice through the tape at each tile joint so every tile carries its own piece of the guide.
4. Cut to the tape. The bold tape edge is now the guideline for your blade on every piece — stick to it, and the cut pieces line up through every intersection when they're set.