This section specifies remediation of concrete slabs out of conformance to moisture vapor emissions and percent relative humidity at core of concrete slab (generally exceeding 75%). There are several methods for testing moisture in concrete and how best to test a slab’s moisture condition, however, others have a high level of inaccuracy and deviation, and therefore predictions are incorrect. Moisture transmission How does moisture transmission occur? Excessive moisture below concrete slabs can cause structural degradation of soil bearing strengths, and swelling and shrinkage of soil. Contractors are under pressure to complete projects on ever-shorter schedules with ever-tighter budgets. Inadequate water drain off from the building — moisture travels from the outside, into and up through the concrete capillaries and through the flooring system. Answer: Moisture-related problems with flooring materials installed over concrete slabs are not new and have been around since the earliest days of flooring installations. Due to its low thermal conductivity, a layer of concrete is frequently used for fireproofing of steel structures. Contact Us . Climate. These materials then become ideal food sources for mold. Readiness of concrete slab . After Slab Construction Apply Damping Agent for Existing Concrete Floor . That being the case, sometimes moisture is a concern. How to Do a Moisture Test for Concrete Slabs. An incorrect prediction can offset construction timelines by months ending up in massive cost overruns, scheduling issues and the list goes on. We will provide you with an honest and detailed documentation of all information and data collected, including moisture issues that may exist within your concrete slab. A universally recognized test method for moisture is ASTM F2170 for relative humidity and ASTM F1869 for calcium chloride. Moisture Remediation Concrete protects surfaces from freeze/thaw damage, reduces dusting of concrete, and increases coating life by as much as 300%. The potential for corrosion of the reinforcing steel must be considered, and the designers and builders must assure that moisture is not allowed to penetrate the concrete structure from the ground side. twitter. Mold growth can commence within 24-48 hours of moisture impact. The understated values gave rise to the development of a second moisture test. The in-situ probes are the sensors that can be inserted into … Active source (rain water seeping under the slab, plumbing leak, etc.). structural integrity of the concrete slab must also be considered. No, water isn’t going to soak up like a sponge, but concrete does allow water to seep through when there is enough. The calcium chloride moisture test is designed to quantify the volume of water vapor emitting from a 1,000 sq. The imperative to get the job done quickly and efficiently may overshadow the need to fully test concrete slabs to determine whether moisture remediation is called for. The concrete should then be cleaned by light grinding. In this method, damping agent (such as liquid epoxy damp proof membrane) is applied for an existing concrete floor system. There are a number of reasons why moisture-related flooring problems are so common today. Checking with your insurance carrier is the best way to determine your coverage for a water leak in your concrete floor slab. His experienced clients (which include contractors for Wal-Mart, Bed Bath and Beyond, and other national retailers) are savvy enough to concern themselves with controlling moisture early on, and call specialists like him at … Therefore, it's advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers. Moisture testing must be performed on all concrete slabs regardless of their age or grade level, including areas where resilient flooring has already been installed. Can mold grow on concrete? Concrete is porous with tiny air holes caused during initial pouring and curing. pinterest. 5. How will you know your slab is prepared to receive flooring covering? However, anything attached to wet concrete, such as wood flooring, carpet, cabinets, wood framing, and so on, can all absorb the moisture from a concrete slab. However, the magnitude and frequency of such issues does appear to be more prevalent today. Moisture testing should be conducted with the area or building at service conditions, i.e. There are a number of reasons, but the most common include: 1. Concrete … The tests last from 60 to 72 hrs. There are three standard methods for measuring concrete moisture. Your policy probably covers foundation replacement, but it may not pay for fixing or replacing plumbing lines in the slab. 4. facebook. Moisture testing is an essential part of determining the suitability of a concrete slab to receive a resilient floor covering. Thermo-hygrometers (sometimes called RH meters) are a special kind of moisture-testing device that can be used to monitor temperature and relative humidity conditions in a given area. Surface preparation must be sufficient to allow Pene-Krete to penetrate the surface. ft. concrete slab over a 24-hour period. Testing concrete for moisture, ASTM F2170 stipulates the use of in situ probes to determine the moisture condition of a concrete slab at the time that it will be sealed or covered by flooring material. Here’s how it works: The building must be acclimatized to the anticipated service conditions for 48 hours prior to testing. Newly made concrete is physically not the same material as mature concrete ¹; Concrete slabs can be replenished with moisture after drying if no vapor retarder/barrier is present, or if it has been damaged in some way ; Concrete in itself is not damaged by having high moisture states. There are five possibilities as to where moisture can come from: 1. Excessive moisture below concrete slabs can cause structural degradation of soil bearing strengths, and swelling and shrinkage of soil. Tests will measure the moisture that is contained inside and emitted from the slab. Moisture impact requires quick decision-making to remove standing water, determine specific building materials affected, and dispose vs. save specific site contents. Basements and floors on grade are particularly vulnerable to moisture vapor caused by pressure that pushes upwards through small air holes in concrete. Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings, but too much moisture in the concrete can cause problems with flooring installations. These can adversely affect a concrete slab on grade. Moisture Remediation. 3. concrete slab, or even into the wall cavity. Concrete Moisture Remediation System Can be applied at any time after 24 hours of concrete being placed. Where substrate moisture exceeds the maximum limits allowed, we recommend ARDEX MC™ Moisture Control System, a two-coat mixture control system . Concrete has a mind of its own and often is subject to the environment as well as being affected by the way in which it was first installed. A concrete moisture meter, like the C555 concrete moisture meter from Wagner Meters (coming soon), can provide immediate qualitative slab assessment. Moisture Tests For Concrete Slabs Armstrong recommends conducting a calcium chloride test per ASTM F-1869, the relative humidity ( in-situ ) probe test per ASTM F-2170, or the Armstrong 72 hour bond test. Cracks, control joints, and expansion joints must be addressed properly. youtube. Hydrostatic pressure (water table is higher than the slab). Provide you with a prompt and professional service. This is an ideal location to use either an epoxy or polyurethane concrete sealer. Concrete absorbs water like a sponge. Moisture Remediation Proper testing is required to determine actual moisture levels. It measured moisture that reached the concrete slab surface, that is moisture from the top inch or less, and not the entire concrete slab. I decided that when the slab was poured, the workers pouring the concrete would use a garden rake and lift the WWM from the bottom of the concrete (the WWM was in place and the concrete placed on top of the WWM) and pull the WWM up into the center of the concrete. 2. Concrete moisture Remediation. Eliseian's Concord, Calif. Company provides soup-to-nuts assistance to concrete contractors and slab owners-from mix design, to testing existing slabs, to remediation. This test method involves measuring relative humidity levels inside of the concrete slab and finds its basis in testing commonly performed in Europe and other countries requiring concrete moisture vapor remediation. If an effective, low-permeance vapor retarder material is not installed directly in contact with the underside of the slab, the concrete will be exposed to a perpetual source of moisture rising from below. When you and your agent discuss slab leak insurance coverage, be clear on the details. Flooring moisture barrier warranties. Wet or damp concrete slabs often contribute to indoor mold problems. Humidity difference between the slab and the air above the slab. Thermal damage. Contact Us 1-888-780-3229 [email protected]. Request A Quote. During the cure time of concrete, moisture moves upwards and evaporates leaving a trail of air holes behind that are effectively like small straws. The second source is moisture rising from below the slab. Moisture and salt are two of concrete… That, in itself, is not a problem. Moisture problems can be solved through expensive moisture remediation processes, however, the best method is prevention. yelp. Moisture damage can occur shortly after installation or at a future date. Moisture Remediation Tradesheet.pdf: File Size: 1608 kb: File Type: pdf: Download File. You have a rock-hard concrete floor and it seems impervious to water intrusion. Extensive knowledge in moisture remediation systems. These can adversely affect a concrete slab on grade. to 3 lbs. Vapor retarders are the last defense against sub-slab moisture. Excess water added to new concrete to make it workable or pumped. Concrete countertops must be sealed to avoid staining. Covering a concrete slab too soon can result in the floor covering being damaged. By Malcolm Cunningham, BRANZ Principal Scientist Figure 1: Moisture profiles in a drying concrete slab. Excess moisture from a slab can affect the integrity of flooring adhesives (left) and can cause mold or mildew growth (right) What about the “plastic sheet test?” You may be familiar with what’s known as the “plastic sheet test.” With this method, a square piece of plastic is taped onto the concrete slab for at least 16 hours. ASTM-F-2170 is the standard used to measure moisture deep in a concrete slab through the application of thermo-hygrometers with in-situ probes. Will reduce a moisture vapor emission rate of 25 lbs. Here in Florida, most building foundations are concrete slab. Concrete slabs, block walls and pipelines are susceptible to cracking during ground settlement, seismic tremors or other sources of vibration, and also from expansion and contraction during adverse temperature changes. Billions of dollars are spent annually to fix flooring failures due to moisture-related issues. To get the timing right, it helps to understand what the various measurements are telling you. 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