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Author Topic: NOT A RECOMMENDED INSTALLATION!  (Read 3411 times)
Rod Johnson
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« on: October 26, 2006, 10:44:14 AM »

I've posted this excerpt from our main website to respond to an often asked question. The information is fron the University of Minnesota, USA with my comments included.

APPROACH 4:
NOT RECOMMENDED BY Johnson Group Contracting

Interior Drainage Channel within the Slab Edge



Another technique is to place a drainage channel at the base of the wall on top of the footing. This requires removing and then replacing the concrete along the slab edge. The drainage channel is connected to a drain pipe leading to the sump. The sump should have an airtight, childproof cover. This approach is effective for concrete masonry walls with water problems because it drains the block cores completely. Holes must be drilled at the base of every block core to permit drainage. This may require removing more than the minimum amount of concrete, as shown, to fit the drill in. These systems have different shapes and prices depending on the product installed. Because moisture is allowed to penetrate the block cores, it is essential to cap the tops and place an air-vapor barrier on the wall.
From Johnson Group: This system cannot drain groundwater from under the floor slab. Water can fill up under the floor to the height of the drainage channel causing a cold floor, vapour transfer in the home and wicking of water up through floor cracks.

 

APPROACH 5:
RECOMMENDED  Our choice for interior applications!

Interior Drainage System Beneath the Slab;
we call it the IWCS or the Interior Water Control System!



The most effective of the interior drainage systems is a perforated drain pipe installed inside the perimeter of the footing. This requires removing and replacing concrete at the slab edge. By placing the drain pipe beneath the slab, it drains the area to a lower level. Similar to an exterior system, the drainage pipe connects to a sump. The sump should have an airtight, childproof cover. A critical component of this approach is the dimpled plastic sheeting placed at the base of the wall and beneath the slab edge. Dimpled sheeting is similar to a small egg crate and permits free drainage down the wall and across into the drain pipe. It is less expensive than many specialized drainage channel systems. In low permeability soils, this system cannot accept rising groundwater unless there is an aggregate layer under the slab.


For further detailed info, go to the main page on this subject here: http://www.leak-proof.com/interior_weeping_tile.htm
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