Terms of Success Part I: The Real Dangers of Hydrostatic Pressure

Terms of Success Part I: The Real Dangers of Hydrostatic Pressure

By Jason Spangler in Troubleshooting Concrete Moisture & Rapid RH® | 0 Comment

Concrete can be a problem when we do not comprehend the fundamental construction terms related to its installation. Contractors also tend to misuse the term, hydrostatic pressure, to describe the dangers of moisture. High relative humidity (RH) levels and hydrostatic pressure can both ruin floors. However, contractors overestimate and overuse the words hydrostatic pressure when […]

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Terms of Success Part II – Humidity: Relative and Comparative Testing

By Jason Spangler in RH Testing Concrete Moisture & Rapid RH® | 0 Comment

This may not be an academic paper on the linguistics of concrete floor installation. Yet, we need only look to the definitions of two words to understand how their confusion leads to concrete moisture problems in flooring. Specifically, floor installation hinges on a contractor’s solid grasp of two methods of testing: Relative: something dependent upon […]

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Concrete Vapor Barriers – Understanding Concrete Moisture Problems

By Jason Spangler in Concrete Moisture & Rapid RH® MVER | 53 Comments

Anyone that has had to face a moisture problem with a concrete slab understands the damage that excess moisture can cause. Moisture in concrete can occur from a variety of sources: ground moisture that contacts the slab through either capillary action or as water vapor, high air humidity or drastic changes in relative humidity in […]

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Dehumidification and Drying Concrete: Hurrying Up the Wait

By Jason Spangler in Concrete Moisture & Rapid RH® Drying | 2 Comments

In flooring applications, either finished concrete or applied flooring, there is always a “hurry up and wait” element – wanting to move ahead but knowing that rushing too quickly may result in a flooring failure or flooring problem. Meeting concrete and flooring specifications can seem to be a luxury that is not always available to […]

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A Cooperative Approach to RH Testing for Concrete

By Jason Spangler in RH Testing Concrete Moisture & Rapid RH® | 0 Comment

From the point of conception to the moment of truth, a new home unites a small army of building professionals. All are accountable for the integrity of a completed structure. Concrete slabs require a vital process of moisture management in which relative humidity (RH) levels must balance while a slab dries and cures. Slabs which are installed […]

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Concrete vs. Cement Part I

By Jason Spangler in Concrete Chemistry Concrete Moisture & Rapid RH® | 0 Comment

One of building industry’s biggest problems is our expectation for concrete to hurry up and dry so we can get on with construction. It’s like telling a child to hurry up and learn. Problems ensue. In construction, concrete slab moisture problems result from many possible mistakes. One is a common misunderstanding of the difference between […]

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Concrete Floor Finishes: Don’t Polish ‘Til It’s Dry!

By Jason Spangler in Concrete Moisture & Rapid RH® Drying | 3 Comments

Concrete floor finishing tastes are surprisingly subjective. However, strength and performance characteristics are beyond question when concrete slabs are properly installed. Professionals choose designer finishes to dazzle with color and light reflection while warehouse tenants choose concrete for its resilience to forklifts and work boots. Individuals may opt for the beautiful, buff-polished beauty of bare […]

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The Real Costs: Calcium Chloride (CaCl) vs. RH Testing

By Jason Spangler in CaCl Concrete Moisture & Rapid RH® | 0 Comment

For decades, flooring contractors have conducted moisture tests to verify the appropriate “dryness” of a concrete slab, prior to installing finished floor products. The anhydrous calcium chloride (CaCl) provided a moisture vapor emissions rate (MVER) which was the industry benchmark since the 1950s. In the 1990s, experts raised methodology concerns and suggested that the CaCl test did not […]

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The Practicality of CaCl – A Test Message That Will Self-Destruct

By Jason Spangler in CaCl Concrete Moisture & Rapid RH® | 0 Comment

Building contractors and flooring installers most often choose one of two methods to test for moisture in concrete slabs: either the calcium chloride (CaCl) test or the relative humidity (RH) test. ASTM International, which publishes technical standards for a wide range of materials, has developed standards for both tests. That doesn’t mean the two methods […]

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The Bottom Line of RH Testing

By Jason Spangler in RH Testing Concrete Moisture & Rapid RH® | 0 Comment

Relative humidity (RH) testing is a 21st-century challenge to the traditional anhydrous calcium chloride test. Over the years, contractors have deployed various means of measuring concrete moisture content (MC). Calcium chloride testing dates back to the 1940s, and since that time, flooring contractors have shaken their heads as concrete moisture problems ensued. The anhydrous calcium chloride test said […]

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Concrete MVER Testing Is Only Skin Deep

By Jason Spangler in Concrete Moisture & Rapid RH® | 0 Comment

Whether it’s wood or concrete construction, knowledge empowers all players to assess moisture content for optimum results. Moisture Vapor Emissions Rate (MVER) Commonly called the calcium chloride test, MVER is a traditional measure of concrete moisture content. Due to its longevity, building contractors still use it. However, installers had used calcium chloride to measure concrete […]

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