Tread Gauge as a Template

The Problem

No staircase is perfectly square. Measure a tread opening with a tape, cut to that width, and the tread meets out-of-square skirts with a gap at one end or the other — on every step, all the way up.

The Technique

1. Set a stair tread template tool into the tread opening and expand it until its ends and edges sit against the skirts. The tool captures the true shape of that specific stair — the width and the actual angle at each end.
2. Lock it, lift it out, and lay it on the tread stock.
3. Trace, and cut to the line.

Every tread fits because you copied the stair itself instead of trusting a number that assumed square. Each step gets its own capture — the out-of-squareness differs step to step, and the tool makes re-capturing faster than re-measuring.

The Problem

Shelves in an alcove or niche have to fit between two walls that are never quite parallel and never quite plumb. Measure the width with a tape and cut square, and the shelf binds at one end and gapes at the other — because the number was right and the angles were wrong. Each shelf becomes a cycle of cut, test, shave, test.

The Technique

A tread gauge — the adjustable template tool made for measuring stair treads between skirt boards — captures the whole geometry at once:

1. Expand the gauge in the alcove at the shelf's height until its ends press against both walls. The pivoting end plates seat flat against each wall, recording not only the width but the angle each wall actually makes.
2. Lock the gauge.
3. Carry it to your plywood, lay it down, and trace the ends — the true width and both wall angles transfer in one go.
4. Cut to the traced lines. A track saw makes the long clean cut, and the shelf slides in snug.

One capture per shelf position — walls change as they rise, so gauge each shelf at its own height rather than reusing the first tracing.