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5thWall Building Diagnostics Consultants Government Services Annex <br /> District Attorney Office <br /> Roof Replacement <br /> November 2009 <br /> B . Uniformly coat masonry surfaces which are to receive flashing with asphalt primer <br /> applied at rate of one gallon per 100 square feet. <br /> C . Apply shingles over underlayment up to front face of chimney . Apply metal front base <br /> flashing with lower section extending at least 4 inches over shingles . Set base flashing in <br /> a 1 / 16 inch coating of asphalt flashing cement on shingles and chimney face . Apply <br /> metal step flashing at sides in a coating of asphalt flashing cement . Embed end shingles <br /> in each course that overlap step flashing with asphalt roof cement . <br /> D . Apply metal rear base flashing over cricket and back of chimney in coating of asphalt <br /> roof cement . Apply end shingles in each course up to saddle and cement in place . Lap <br /> base flashing minimum of 3 inches with metal counterflashing . <br /> END OF SECTION <br /> 09 -26 Asphalt Fiberglass Shingles <br /> 073113 - 7 <br />