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LATH & PLASTER Section 09200 15-1207 temperature is below 40 degrees F or is expected to fall outside this limit within 24 hours after application. Protect base coats from freezing for at least 24 hours after installation. B. Do not apply finish coat when ambient temperature is or will fall below 45 degrees F for 24 hours after application. Do not apply finish coat to brown coat that is wet, frozen or covered in frost. Substrate shall be properly cured and dry per manufacturer's recommendation. C. Protect base and finish coats from uneven and excessive evaporation in warm, windy weather. 1.09 FIELD MEASUREMENTS A. Make and be responsible for all field dimensions necessary for proper fitting and completion of work. Report any discrepancies to Architect before proceeding. 1.10 TESTING & FIELD OBSERVATION A. Lath and Plaster System Testing: The Work is subject to field observation and sampling by the Owner's Consultant and Testing Lab. Testing may be waived by the Architect if optional Pre -blended Plaster Mix is used by the installer, or if the correct field mix of materials and proportions can be observed and documented by the project inspector. If testing is determined to be necessary, the Owner will pay for the first tests of a single wall and soffit sample. If the tests indicate that the sample(s) do not meet the minimum requirements of the standards as referenced herein, all subsequent testing (based on quantities described within these specifications) will be paid for by the Contractor. The Contractor must provide safe access to the work areas and the information necessary to accomplish such observation and sampling. Any information or assistance offered by the Consultant or Testing Lab will not relieve the Contractor of the responsibility for the work. 1. The Contractor is required to provide one 12 -inch square sample of the lath and plaster system taken from the building wall for every 5000 square feet of wall area. In addition, the Contractor will be required to take from the building soffit, at least one 12 -inch square sample of the lath and plaster system from each building. All sample removal shall be done under direct observation by the Project Inspector and/or Architect. 2. Sample testing will include a petrographic examination and chemical analysis of the lath and plaster system. As a minimum, the analysis will check for system thickness, bonding between coats, strength properties of the materials, cracking, proper curing and cement hydration and a section analysis of the cement paste. 3. Should the Work (or portion of the same) fail to meet the requirements of the specifications or determined to be defective, the Work will be required to be replaced by the Contractor at no additional cost to the Owner. 4. Contractor is responsible for patching back all locations where samples were taken. Surrounding cement plaster finish shall be removed to 6 -inches back, all-around, from where sample was taken leaving only the lath and backing paper. Angle the saw -cut at sample location so that surface of adhesion is maximized and feathering of patch is more easily achieved. New backing paper shall be installed over exposed wall sheathing at patch area and behind existing backing paper and a layer of self-adhesive flashing membrane shall be installed over the new and existing backing paper. Replace lath removed at sample area with new lath wired to existing lath and fastened to substrate. Use specified Bonding Agent at existing, cut plaster edge prior to installation of cement plaster patch to aid in adhesion and eliminate cracking. Finished patch shall match adjacent surfaces by feathering out entire area into existing finish. 4