bullfloat, wait, power float with float pan, fresno, and broom.Two differing finishing techniques used for exterior concrete surfaces include: The inconsistency in defining a broom finish makes it difficult for the contractor to decide what is being specified and how to bid the specified broom finish. However, the five specification clauses cited contained six different variations in describing the broom finish: In the absence of any data, the authors also cannot determine if the 2 to 3-mm range describes variations that can realistically be achieved on a large-scale concrete placement.Īt first it might seem simple-a broom finish is a broom finish. Measuring the striation depth for a broomed surface is uncommon, and it is unclear as to how this would be done. The terms “uniform” and “consistent” do not describe measurable standards, but are subject to interpretation by the specifier or architect, and thus could be considered escape clauses.Īs mentioned, two of the five cited specification clauses require a 2 to 3-mm (1⁄16 to 1⁄8-in.) depth of the broom striations. Unfortunately, the words “uniform,” “consistent,” or even “co-ordinate” are often interpreted to mean “to the satisfaction of the architect.”ĬSI, ACI, and Federal Highway Administration (FHWA) caution specifiers not to use the phrase “to the satisfaction of the architect.” FHWA states these are “escape clauses” that do not convey a measureable standard and should not be used in specifications. Yet, another clause requires the contractor to “co-ordinate” the final finish with the architect. Out of the five specification provisions cited, one requires a “uniform fine-line texture” and another requires a “consistent appearance” for a broomed surface. Photo courtesy TAS Commercial Concrete Construction Therefore, overlapping passes are quite visible and cannot be avoided. On large-area placements, finishers cannot see the exact line at which one broom pass ends and the next begins.
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