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Those who are qualified to install, maintain, repair or alter any system of refrigeration unlimited to <br />tons or horsepower provided, however, that such refrigeration is intended to be used for the purpose <br />of food and product preservation and is not to be used for comfort systems. <br />Those who are qualified to fabricate, place and tie steel reinforcing bars (rods) of any profile, <br />perimeter, or cross-section, that are or may be used to reinforce concrete buildings or structures in <br />such a manner that under all agreed specification, steel reinforcing bars (rods) for concrete buildings <br />and structures can be fabricated, placed and tied. <br />Those who are qualified and certified to erect, construct, fabricate and install roof decks of portland <br />cement or gypsum concrete, using lightweight aggregate, on joists or other supporting members <br />erected by others, and shall include the placing of forms and welding of supporting members for <br />forms and miscellaneous reinforcing of the deck and the proportioning, mixing and placing of <br />cement, aggregate and water, provided, however, that roof decks of wood, metal, heavy aggregate <br />concrete, glass or plastic and the application of roofing felts or other water resistant membranes <br />shall not be a part of the scope of such work, <br />Those who are qualified to install, repair and replace residential steep roof coverings. Work may <br />include fabrication and installation of sheet metal incidental to residential steep roof coverings and <br />installation of asphalt shingles, asphalt roll roofing materials, clay tile, concrete tile, slate, wood <br />shake or shingles and other prefabricated shingle products. <br />Those who are qualified to install, repair and replace roof covering. Work may include, but shall <br />not be limited to roof deck insulation, roof coating, painting and covering, including use of sheet <br />metal and installation of other sheet metal products incidental to roofing work or other material in <br />connection therewith, or any combination thereof, and including installation of non-structural <br />decking and siding, <br />Those who are qualified with experience and skill to install, repair, alter, extend and excavate for <br />septic tanks, interceptor tanks; may clean sewer lines, but shall not include any other plumbing <br />work or connecting pipes or pumps. <br />