Contractors are not always responsible for puddles on concrete balconies.
In part 2, Face discusses straightedge tolerances, and their inaccuracies.
Concrete floor quality is not guaranteed by high F-numbers, but rather creating a long-lasting durable floor.
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The F-min number system spurred from a need to ensure quality flat warehouse floor construction.
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What are "superflat" floors?
The Atlanta Bonded Warehouse Corp. (ABW), Kennesaw, Ga., has always tried to improve its facilities and operations with each new warehouse or expansion.
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Two national flooring associations have endorsed a position statement on floor flatness tolerances written by the American Society of Concrete Contractors (ASCC).
Our business has become more focused on polishing concrete retails floors, and we are concerned how grinding and polishing affects a floor's flatness and levelness. How can we be sure we are meeting the correct specifications? Do any studies exist showing the effects on FFand FL numbers?
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If a contractor delivers a floor that does not meet the specified flatness, chances are good he will end up in court, possibly spending thousands of dollars on litigation, which could put his business in jeopardy.
Achieving a flat and level elevated slab is a challenge, but one that has been met by many concrete contractors.
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The odds of
This is the second in a series of articles about our warehouse floor field test. The purpose of the study is to find economical ways to reduce curling in warehouse floors and to study the rate of moisture loss in concrete after placement.
First used on a large-scale commercial project in 1983, the F-number system for measuring floor flatness and levelness has been perhaps the most significant factor in enabling the construction of flatter and more level concrete floors.
The idea of initiating a field test to learn more about shrinkage and curling in warehouse floors is something that Concrete Construction magazine has considered for the past couple of years. So when Greg Scurto, president of Scurto Cement, Gilberts, Ill.
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The ACI Tolerances committee spent a grueling three and a half hours in St. Louis on Nov. 4 working through 45 comments from the Technical Activities Committee (TAC) on revisions to ACI 117, Specification for Tolerances for Concrete Construction and Materials. The TAC review is one of the last...
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The construction of suspended slabs that exhibit superior flatness and levelness can't happen without vision, planning, and execution.
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There are many engineers in our industry that are experts when consulting contractors on how to build the perfect commercial floor slab. But in many aspects of the concrete industry, including floor slabs, time and technology can provide for even greater improvements.
Placing and finishing lightweight concrete can be a tricky and risky task. Success requires teamwork from the owner, architect/engineer, general contractor, ready-mix producer, and concrete contractor.
When it comes to choosing the “right tools for the job,” the prudent contractor does his homework before getting in over his head. Today, choosing tools incorrectly, or not including the needed tools in the bid for a project, can financially sink a contractor when repairs are needed because of poor...
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The CSDA is one of the associations that joined with related organizations from around the world to create IACDS in 1995, and then worked together with IACDS members to determine useful tolerances applicable to this type of work. Originally developed in 2002, the IACDS standard was updated in 2006...