A re-usable form for making diamond isolation joints used in the construction of buildings is disclosed. The form is made from wood, plastic cardboard, plastic sheet, wax coated cardboard or other material that can easily be separated from concrete. The form is placed onto a footing for a column or block out and the floor is poured around the form. After the floor is cured the form is collapsed inside itself to create the void of the diamond isolation joint sealant. The form can be re-used in another isolation joint sealant in the same building or on future construction projects. The form can be fabricated on site in various heights and dimensions. The form is folded or collapsed to make it easier to transport and store.
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