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Gateway Park Center PERKINS+WILL <br /> 810495.000 <br /> 12/06/18 <br /> <br /> <br />RESINOUS MATRIX TERRAZZO FLOORING <br /> 09 66 23 - 6 <br /> <br /> <br />PART 3 - EXECUTION <br />3.1 EXAMINATION <br />A. Examine substrates and areas, with Installer present, for compliance with <br />requirements for installation tolerances and other conditions affecting per formance <br />of the Work. <br />B. Proceed with installation only after unsatisfactory conditions, including levelness <br />tolerances, have been corrected. <br />3.2 PREPARATION <br />A. Clean substrates of substances, including oil, grease, and curing compounds, that <br />might impair terrazzo bond. Provide clean, dry, and neutral substrate for terrazzo <br />application. <br />B. Concrete Slabs: <br />1. Provide sound concrete surfaces free of laitance, glaze, efflorescence, curing <br />compounds, form-release agents, dust, dirt, grease, oil, and other <br />contaminants incompatible with terrazzo. <br />a. Shot-blast surfaces with an apparatus that abrades the concrete <br />surface, contains the dispensed shot within the apparatus, and <br />recirculates the shot by vacuum pickup. <br />b. Repair damaged and deteriorated concrete according to terrazzo <br />manufacturer's written instructions. <br />c. Use patching and fill material to fill holes and depressions in substrates <br />according to terrazzo manufacturer's written instructions. <br />C. Verify that concrete substrates are dry and moisture-vapor emissions are within <br />acceptable levels according to manufacturer's written instructions. <br />D. Preinstallation Moisture Testing: <br />1. Testing Agency: Engage a qualified testing agency to perform tests. <br />2. Moisture Testing: Perform tests so that each test area does not exceed 200 <br />sq. ft., and perform no fewer than three tests in each installation area and <br />with test areas evenly spaced in installation areas. <br />a. Moisture-Vapor-Emission Test: Maximum moisture-vapor-emission rate <br />of 3 lb of water/1000 sq. ft. in 24 hours when tested according to <br />ASTM F 1869 using anhydrous calcium chloride. <br />b. Relative Humidity Test: Maximum 75 percent relative humidity <br />measurement when tested according to ASTM F 2170 using in-situ <br />probes. <br />3. Proceed with terrazzo installation only after concrete substrates pass moisture <br />testing or after installation of moisture-vapor-emission-control membrane on <br />substrate areas that fail testing.