picking up dust with a damp rag preferably before any bond breaker is applied to the concrete floor the strips 16 run the length of the base strip 10 the base strip 10 includes an angled side 18 which provides the function of a separate chamfer strip as used in the prior art the strip 10 also includes a longitudinal slot 20 which has angled sides 22 and 23 as seen in fig1 and 2 into which the bracket 12 is inserted as will be discussed subsequently preferably the base strip 10 is formed of a suitable plastic material which has some resiliency to facilitate the base 30 of the bracket 12 snapping into the slot 20 a plurality of the brackets 12 are inserted into the base strip such as at 2 foot intervals to suitably support a wooden form 26 note fig2 turning now to more details of the bracket 12 the same includes the base 30 having angled walls 32 and 33 to fit or snap into the slot 20 of the base strip 10 adjacent to and mate with the angled walls 22 and 23 of the strip 10 the bracket 12 further includes an upstanding support 36 which u201c backs up u201d the wooden form 26.