How to buy wood at a lumberyard: sizes, defects and usable stock

What should you take to the lumberyard?

Take a parts list with quantities, finished thickness, width and length. Add a sketch showing visible faces, grain direction and any pieces that need to match. Ask whether the quoted stock is rough, partly surfaced or prepared to agreed dimensions.

A board foot is a volume unit, not a promise that a particular part will fit. Woodworkers Source distinguishes buying by volume from ordering prepared sizes; other suppliers may use different services, tolerances and billing rules.

Inspect, lay out, then price

1. Start with the difficult piece. Show the supplier your longest or widest required part. Confirm that a suitable blank can be supplied after trimming and flattening.
2. Look along each board. Check the face and edge for curvature, then check for a twisted corner. Turn the board over and look at split ends, knots and damaged edges. Ask before handling a heavy board or rearranging a stack.
3. Mark a possible layout. Put your part rectangles between the defects. Include cutting and preparation allowances rather than assuming every square inch becomes a finished part.
4. Discuss dried condition. Ask how the stock was dried and stored, and whether its moisture condition suits the intended room. Purdue explains why the environment matters; there is no universal waiting period that makes every board ready.
5. Compare the prepared total. Record milling, selected-width charges, cutting, transport and the material you expect to discard. Ask which dimensions are used for billing.

For example, two short trim pieces may fit around a knot that rules a board out for one long visible rail. This is why a low price per board foot does not always mean a low project cost.