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Opening of Quotes - Olive Street Station Roof Repairs Proj No. 120-028 - Midland Engineering Company, Inc.
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Opening of Quotes - Olive Street Station Roof Repairs Proj No. 120-028 - Midland Engineering Company, Inc.
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8/26/2020 8:48:51 AM
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Board of Public Works
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Projects
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8/25/2020
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allow to set to "thumbprint hardness" and apply another layer finally <br />bringing flush to the exterior face of the brick surfaces. <br />a. When placing in layers, it is imperative to allow each layer to <br />become stiff before the next layer is installed. <br />b. Pointing tools shall not exceed the width of the joint being <br />tuckpointed <br />4. Tooling Joint: <br />a. When the final layer is "thumbprint" hard, tool the joint with a <br />convex runner tool to produce a dense, tight, flush slightly <br />concave joint. <br />b. Those joints which are to be recessed to receive other materials <br />may be tooled smooth with the pointing tool. <br /> <br />D. Final Wetting Cure: <br />1. Periodically, mist joints using clean water for at least a 72 hour period. <br /> <br />E. Clean-up: <br />1. Remove uncured mortar from the perimeter of the joint before it dries, <br />using clean water and a rubber sponge or a dry brush. Cured mortar may <br />only be removed chemically or mechanically. <br /> <br />3.4 MISCELLANEOUS REPAIRS <br /> <br />A. Fractures in Brick Masonry: <br />1. It is intended that the stress cracks which are in the exterior face brick <br />and which range from 1/32" to 1/8" in width are to be injected with a <br />silicone sealant to seal the joint and to match the brick color. <br />2. Those fractures which are larger than 1/8" are to be: <br />a. Cut out following line of fracture, to a minimum depth of one and <br />one-half inches (1-1/2"). Thoroughly clean each joint, removing all <br />loose materials. Leave masonry sides of joints exposed and <br />clean. <br />b. If a fracture is due to structural movement, repair the fractures <br />with a sealant of suitable color especially prepared as a flexible <br />bonding material and in such a manner that expansion and <br />contraction in these stress-inclined areas will still be permitted. <br />c. If the fracture is not the result of structural movement, repair with <br />special mortar mix containing suitable materials to match brick <br />color. <br /> <br />3.5 SEALANT RESTORATION <br /> <br />A. Removal Work: <br />1. Remove existing sealant in those joints which are currently caulked or <br />sealed with sealant. <br /> <br />B. Preparation of Surfaces: <br />1. A clean, dry surface is required. <br />2. Rake joints clean, brush and dry where necessary. <br /> <br />MASONRY RESTORATION REPAIR <br />04920-4 <br /> <br />
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