The phrase "scrap lumber" refers to small, leftover pieces of wood that are usually left unused after construction or woodworking projects. Full definition
I went to my stash of left over 2x4s and 2x6s and managed to build the entire frame out of scrap lumber from the house renovation. (grandmashousediy.com)
When my builder saw the plans for the island he had misgivings about how it would actual fit & function properly so he created a mock - up from scrap lumber of the island and the base cabinets opposite — it was very rough and only took him an hour to make it but gave me a much better feel for how it would all fit. (theinspiredroom.net)
Today I am showing you the rustic step stool I built using scrap lumber and a jigsaw. (mamasdance.com)