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Opening of Quotes - North Pumping Station Flood Damage Repairs Proj No. 118-302 - No Quotes Received
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Opening of Quotes - North Pumping Station Flood Damage Repairs Proj No. 118-302 - No Quotes Received
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10/12/2021 1:54:04 PM
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Board of Public Works
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Projects
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10/12/2021
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<br />Version 08/25/2021 Page - 9 Public Works Quote <br />F. Preparation <br /> <br />Contractor shall protect adjacent windows, utility piping & equipment, masonry and other elements <br />surrounding the work of this section from damage or disfiguration due to repair operations. <br /> <br />Where materials are attached to the masonry temporarily remove same to sufficiently allow access to <br />the masonry for required work. Re-attach or re-install at end of project. Provide new attachment <br />hardware where missing, finished to match existing. Contractor shall repair to existing condition any <br />damage to such materials caused by repair efforts or replace with like kind. <br /> <br />G. Repointing <br /> <br />Remove the damaged or fractured existing mortar joints to a minimum depth of 1", or as much as may <br />be necessary to reach sound material. Take care to avoid damaging existing masonry units or enlarging <br />width of joints. <br /> <br />Repair or replace existing masonry units damaged by cutting, spalling and chipping caused by routing <br />operations. Thoroughly remove loose material from joints using low-pressure compressed air. Final <br />preparation of the joint shall be done by hand. <br /> <br />Mortar should be mixed carefully to obtain uniformity of visual and physical characteristics and comply <br />with ASTM-C270. Material proportions by volume to produce type N minimum strength. Mortar should <br />be used within 30 minutes of final mixing. Re-tempering is not permitted. <br /> <br />After carefully routing and cleaning joints, wet joints thoroughly and then apply fresh re-pointing mortar. <br />Allow water to soak into joints, but joints shall not be visibly wet with standing water during tuck pointing. <br /> <br />Fill mortar joints in layers not over 1/4" thick with each layer applied with pressure as soon as previous <br />layer has partially dried. Do not tool each layer smooth; leave surface rough to help bond of subsequent <br />layers. Compress the final packing as much as possible to completely fill joint. Compact joints solidly <br />before final tooling. <br /> <br />Tool joints concave to match existing. Take care to not spread mortar over edges of brick onto exposed <br />surfaces. Do not featheredge mortar. Cure mortar by maintaining in a damp condition for 5 days. Allow <br />mortar to fully harden for 10 days after completion of work. <br /> <br />Thoroughly clean exposed masonry surfaces of excess mortar and foreign matter using stiff nylon or <br />bristle brushes and cleaning agent. <br /> <br />H. General Cleaning <br /> <br />Promptly as work proceeds and upon completion, remove excess mortar, smears, efflorescence and <br />droppings. Before cleaning verify that all mortar joints in area to be cleaned have been repointed and <br />are sufficiently hard for cleaning. <br /> <br />Test areas to be cleaned to determine the most effective cleaning method starting with the gentlest <br />means possible utilizing brush and water wash at low pressure. If alkaline or acidic cleaning methods <br />are necessary, mask off areas below to protect finishes that may be damaged by chemical cleaners. <br /> <br />Start cleaning at the lowest designated wall area and proceed to the top of the wall always keeping <br />surfaces wet below the area being cleaned and rinse frequently to reduce the potential for streaking. <br />After the designated area has been cleaned, wash down the wall areas below. The use of abrasive <br />cleaning, beyond stiff bristled brush, will not be permitted. Clean adjacent and adjoining surface of marks <br />arising out of execution of work of this section. <br /> <br />At end of each day’s work, sweep up and remove sand, mortar droppings, dust, dirt, debris, and rubbish. <br />At completion of this work, remove all construction aids and ensure that all sand, mortar droppings, <br />debris, and rubbish have been removed. <br />
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