Form lumber

In building forms, any lumber or boards used for shaping and holding green concrete until it has set and thoroughly dried.

form board, form liner, form lumber

A board or a sheet of wood used in formwork.

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Now, with two (or more) layers of forms up and concrete set up, you can remove the bottom forms and leapfrog them up the wall, thus greatly conserving form lumber, as you work your way up and along the wall.

Slip formed stone walls save money & retain heat

Now, with two (or more) layers of forms up and concrete set, you can remove the bottom forms and leapfrog them up the wall, thus greatly conserving form lumber, as you work your way up and along the wall.