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Orange County Health Department Improvements Smith Sinnett / 2024008 <br />Hillsborough, NC Orange County Asset Management Services <br />TOPICAL MOISTURE VAPOR MITIGATION SYSTEM 07 26 19 - 3 <br />e. VOC: 0g/L, calculated SCAQMD 1113 <br />2.2 HYDRAULIC CEMENT UNDERLAYMENT <br />A. Hydraulic Cement-based Self-Leveling Underlayment. <br />1. Acceptable Products: <br />a. Ardex K60 <br />b. Koster <br />c. Aquafin <br />d. Sonneborne <br />e. Thore <br />f. Or equal by other Manufacturer <br />2. Performance and Physical Properties: Meet or exceed the following values for material cured at <br />70 F+/-3F (21 C+/-3C) and 50% +/-5% relative humidity: <br />a. Application: Barrel Mix or Pump <br />b. Compressive Strength: Minimum 4100 psi at 28 days, ASTM C109M. <br />c. Flexural Strength: 1000 psi at 28 days, ASTM C78. <br />d. VOC: 0 g/l, calculated SCAQMD 1113 <br />PART 3 - EXECUTION <br />3.1 EXAMINATION <br />A. Examine substrates, with Installer present, for compliance with requirements for maximum moisture <br />content and other conditions affecting performance of the Work. <br />B. Verify that finishes of substrates comply with tolerances and other requirements specified in other <br />Sections and that substrates are free of cracks, ridges, depressions, scale, and foreign deposits that might <br />interfere with adhesion. <br />C. Proceed with installation only after unsatisfactory conditions have been corrected. <br />3.2 PREPARATION <br />A. Concrete Subfloors: Prepare substrate in accordance with manufacturers instructions. <br />1. Prior to proceeding please refer to ASTM F710 Standard Practice for Preparing Concrete Floors to <br />Receive Resilient Flooring. All concrete subfloors must be sound, solid, clean, and free of all oil, <br />grease, dirt, curing compounds and any substance that might act as a bond breaker before <br />application. <br />2. Mechanical preparation of the surface is required to obtain a minimum ICRI concrete surface <br />profile of 3 (CSP 3). This substrate preparation must be by mechanical means, such as shot <br />blasting. <br />3. The concrete must have a minimum tensile strength of at least 150 psi for areas to receive normal <br />foot traffic, and 200 psi for area of heavy commercial traffic when tested in accordance with <br />ASTM C1583. The concrete surface can be damp, but must be free of standing water. <br />4. Prior to beginning the installation, measure the relative humidity within the concrete (ASTM <br />F2170). For these relative humidity methods, the RH shall not exceed 100%. No standing water <br />shall be present. <br />5. If the concrete substrate is too uneven to provide a uniform film thickness of the ARDEX MC <br />RAPID or equal (typically CSP 6 or higher), the substrate can be pre-smoothed using a Self- <br />Leveling Exterior Concrete Topping or Moisture Resistant Patch. <br />Docusign Envelope ID: 186E0FF8-664C-4A5C-9F97-28196CE69FD1