Lumber sizes

Standard lumber sizes. Treasure hunt.

Have students find the following sizes of lumber. They will find short pieces in the scrap bins.

1×3, 1×4, 1×6, 1×8, 2×3, 2×4, 2×6, 2×8, 2×10, 2×12.

Also find 1/8, 1/4, 1/2, 3/4 plywood.
1/2, 3/4 MDF
3/4 OSB.

Students will find several pieces of lumber matching the list. They won’t find some. After they have found the board lumber, do a lesson about the real size of each size. Tell them to measure each piece to get the real size. 2×4=1 1/2 x 3 1/2. Do this for all sizes. Why are they called 2×4, if the wood is smaller? Now cover the wood plane. Explain the lumber mill doing a rough cut with big saws. Then they run the wood through a large plane to give all four sides a smooth surface. This removes material and that is why the lumber we get from the local lumber yard is the size it is.

The next lesson will be creating a cut list for flats.