Scribing

The Problem

The last deck board against a wall almost never runs parallel to it. Walls bow, render is uneven, and the board has to follow that line while still leaving a gap — decking needs an expansion gap at the perimeter, and a board pushed tight to a wall will lift or split as it moves.

Scribing the board to the wall solves the shape. The gap is the part people then get wrong, because they scribe tight and try to add a gap afterwards by eye.

The Technique

Build the gap into the scribing block, so the line you draw is already the line you cut.

1. Lay the board to be scribed in position, lined up with the previous board and parallel to it, not to the wall.
2. Work out the block width: the board's width plus the gap you want. His boards are 140mm and he cuts the block at 150mm, which gives 5mm at each end of the run.
3. Run the block along the wall with a pencil held against its far edge, tracing the wall's shape onto the board across the whole length.
4. Cut to the line.
5. Drop it in and check the fit against the wall.

The Problem

Scribing copies an irregular surface onto a workpiece: you hold the workpiece near the wall, run a spacer along the wall with a pencil riding at the other side of it, and the pencil traces the wall's shape onto the board. Cut to that line and the board sits tight against the wall.

It only works if the spacer never loses contact. A washer that spans 10mm can follow a wall that wanders 5mm in and out. Put that same washer against rough stone that hollows back 30mm between proud faces and it drops into the hollows, hits the far side, and the line it draws is no longer a copy of anything — it's a copy of the parts of the wall the washer could reach.

The failure is quiet. The line looks like a scribe line. You cut to it carefully, offer the board up, and it rocks on two high spots with daylight behind it.

The Technique

The spacer sets the limit, so size the spacer to the wall.

1. Look along the surface and find the deepest hollow between the points that stick out furthest. That distance is what the spacer has to clear.
2. Pick a spacer at least that wide. On rough stone, a cut-off angle grinder disc is about right — it's rigid, perfectly round, and around 115mm or 125mm across, so it bridges hollows a washer falls into.
3. Set the workpiece parallel to the wall, held off it by at least the spacer's width, and fix or brace it so it can't shift while you trace.
4. Run the spacer along the wall face with the pencil held against its outer edge. Keep the spacer's travel square to the workpiece the whole way — if it tilts, the offset changes and the line drifts.
5. Cut to the line. The board now sits back from the wall by exactly one spacer width along its whole length, so trim the whole board by that amount, or set it out that far from the start.

The Problem

Scribing baseboard to the floor one piece at a time works, but every piece is its own measure-scribe-cut-refit cycle — and outside corners add a second problem, because the two mitered pieces have to land at exactly the same height or the miter steps. On a whole house of base, piece-at-a-time scribing is where the schedule goes.

The Technique

1. Cut and fit all the base for the room first, mitering the outside corners with the pieces cut to follow the wall angles.
2. Tack everything up at once — a brad in each piece, whole room, all at a uniform height. Pre-tacking is what guarantees both halves of every outside miter sit at exactly the same height.
3. Run a step scribe along the floor across every piece in the room. His scribe tool carries eight offsets in 1/16" steps, so the scribe rides the floor's waves and marks each board with its own contour line.
4. Pull the base off, pull the brads, and rip to the scribe lines on the table saw.
5. Bring it all back: glue the miter joints, then nail everything off — finding studs with a stud finder rather than nailing blind near pipe territory.

The result is base tight to the floor along its whole run and outside miters that close like furniture — no shoe molding covering gaps.

The Problem

Setting cut stone against natural rock is the hardest fit in hardscaping. The boulder's edge is a freeform curve no tape measure can capture, and a slab that almost fits reads as a sloppy gap — mortar can only hide so much between a machined edge and a natural one.

The Technique

Scribing works on stone exactly the way it works on baseboard against a wavy floor — a spacer of constant width rides the irregular surface and redraws it onto the workpiece.

1. Set the slab in position, as close to the rock as it can sit.
2. Take a chunk of wood sized to span the widest part of the gap, hold a marker against its far side, and ride the block along the rock face so the marker drags a line across the slab. The block keeps the marker a constant distance off the rock, so the line is the rock's profile, shifted onto your slab.
3. Cut the scribed curve with a wet saw.
4. Slide the slab in — the cut edge nests against the boulder.

The Problem

Set a straight baseboard on a real-world floor and daylight shows underneath — floors dip and hump, and the gaps telegraph every low spot. The usual cover-up is shoe molding, which works but adds a second trim line you may not want. The craftsman's answer is to make the baseboard's bottom edge match the floor.

The Technique

1. Stand the baseboard in place against the wall, resting on the high spots.
2. Find a small block slightly taller than the widest gap under the board.
3. Set a pencil on top of the block and slide the pair along the floor for the board's full length. The block follows every dip and rise, and the pencil draws the floor's exact profile onto the baseboard's face.
4. Cut to the line with a jigsaw set to roughly a 20-degree back bevel, leaving the pencil line intact. The back bevel means only the board's front edge will touch the floor, so the fit reads tight without needing the whole thickness to match.
5. Bring the edge the rest of the way to the line with a belt sander. Slow the sander down if you're new to it — the goal is kissing the line, not blowing past it.
6. Test the fit, touch up any spots that hold the board off the floor, and install.