Start from the finished board
Choose the finished width, depth, and intended use together. A compact prep board and a large counter board do not need the same thickness. The correct value is one that remains practical to lift, wash, store, and refinish.
Do not copy a number from another design without checking the new footprint and wood. Thickness changes the total volume directly, so a small increase can add noticeable weight to a large board.
The rough assembly must be thicker
The second glue-up needs material for flattening and cleanup. Final thickness equals the rough thickness minus the material removed from both faces. Record these values separately.
Allowances depend on stock preparation, glue-up accuracy, flattening method, tear-out, and the required final surface. Do not hide a shortfall by silently changing the finished specification.
Estimate weight before approving the size
Calculate finished volume from width × depth × thickness, then estimate mass using a documented density assumption for the selected woods. Treat it as an estimate: moisture and natural variation affect the real board.
For a custom order, ask for an approximate finished weight. Confirm that the owner can move the board safely between its counter, sink, and storage position.
Leave enough material for profiles and grooves
Roundovers, chamfers, handholds, feet, and juice grooves consume or depend on thickness. Check the groove depth and its remaining material below the cut. Check edge radii against both the top and bottom profiles.
Finished thickness is not stock thickness. Kerf determines slice yield; flattening and profiling determine how much of the rough assembly remains in the board.
Thickness checklist
- Set finished width and depth.
- Estimate finished weight.
- Check storage, sink, and handling.
- Define top and bottom edge details.
- Add explicit flattening and cleanup allowance.
- Confirm the rough assembly fits the flattening setup.