Masonry Magazine July 2011 Page. 21
Interior Below-Grade Poured Wall
Moisture Control System
Floor Edging (855) Control Cavity ICC 400Control Cavity CC 480
4-Floor Edging
With a complete installation system comes complete confidence.
Image 7. #7 and the material used to create the finished interior wall detailing. (See Image #7.)
Drain field systems that are installed below basement floors, around interior drain tile and around and over exterior tile and around and under sump baskets. When possible, these systems should be constructed out of hard river rock no smaller than 1.25 inches. (Never use sand or pea gravel.) The larger dimension hard rock creates more voids between each unit resulting in more space for water to occupy. The larger voids also create more space for air that in turn insulates the various basement construction details from the surrounding soil temperature and allows the internal man-made heat supply to keep these details warmer. (See Image #6.)
The drain field sizing around and under the sump basket and the preparation of the sump basket is critical. The excavation around and under the sump basket should be oversized a minimum of 12 inches on all sides and at the bottom. This creates a larger capacity reservoir for water and as a result more productive pumping cycles for the sump pump. The sump basket must be a high quality, large capacity unit with a gas tight lid and well designed discharge ports. Before installation drill one-inch holes about two inches off center, starting eight inches down from the top of the sump basket on all sides and on the bottom of the sump basket.
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