We (Master Floor Covering Standards institute) were inspecting a job site recently where an old commercial building was to receive approximately 40,000 sqft of new resilient flooring. The General Contractor had the responsibility of removing the old VCT and leaving the subfloor clean, smooth, dry and free of waxes, dirt, etc. as per the NFCA Floor Covering Reference Manual. in other words 'ready for the flooring contractor to arrive and get on with the job'. Before installation could begin moisture testing in accordance with the NFCA Manual and to the ASTM standards was required. This meant 3 tests for the first 1000sqft and one test for every 1000sqft there after, total 42 tests. It was at this point the GC suggested to the building owner that moisture tests would not be needed because of the expense and because the original slab was 40+ years old. The building owner asked for our opinion and we were clear that they would be required if they wanted the flooring manufacturers warranty in place. 42 tests went ahead and 45% of them failed. As a result a moisture mitigation system was installed by the GC and the project moved forward with warranty intact.
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