Masonry Magazine July 2011 Page. 19
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potentially negative impact on the moisture management of the below-grade construction. Jobsite moisture management, in the form of a jobsite drainage plan and the ongoing implementation of this plan, is critical. Allowing jobsite surface water to run toward and into below-grade construction excavation and details can have a permanent negative impact on project. The inadvertent saturation of soils that surround and support footings and walls is not good. (See Images #4A and #4B.)
The list of potential violators of a jobsite drainage plan is long and includes plumbers, sewer and water utility personnel, and electrical contractors. The standing jobsite rule on this should be that anyone who moves or adds fill to a jobsite should return it to the original jobsite elevation drawings and plans and compact fill as to the specs.
Construction specifications should clearly state excavation dimensions required to safely and efficiently construct the below-grade structure and minimize the size of open excavation, therefore, minimizing the amount of water entering the excavation. (See Image #5.)
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Upon completion of the excavation, form and pour the footings and walls, or form and pour the footings and lay the block. There are two critical principals that must be followed at this stage of the construction process. Firstly, "Do not fool around!" It is imperative that all parties involved adhere to a strict timeline and complete the project on schedule. The amount of excess time this excavation is left open invites moisture management disasters in the form of excavation cave-ins, flooded excavation, etc. Construct the
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READER SERVICE #173
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Image 5.
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www.masonrymagazine.com
#5
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READER SERVICE #165
July 2011
MASONRY
17