Interior waterproofing covers a variety of solutions ranging from digging out the perimeter of the basement and installing drainage tiles in the footer and a sump basin and pump, to installing a plinth with drainage holes to release water from the block to the level. from the floor and channel it to a drain, to waterproof paints and sealants.
Installing interior drainage tile is the most common form of basement waterproofing. A sump pump alone is enough to relieve hydrostatic pressure from a high water table (think of an inverted glass of water) in some cases if the water is mostly on one side or near a corner. This solution does not waterproof the foundation, which can only be done on the exterior by opening the exterior walls to the footer level and applying a waterproof barrier. However, it releases the water pressure at a point below the floor and prevents it from reaching the upper walls and floor seam where it will often seep, thus providing a dry basement.
The concrete is broken about ten inches from the wall and a trench about twelve inches deep is dug around the basement or next to the damp wall. Care should be taken to leave solid concrete spacers against the wall approximately every five feet (which is tunneled to install the drainage tile) to ensure that the wall does not lose its support from the floor and collapse. Drain holes (small holes drilled in each cavity of each concrete block) to release water from the block are installed at the base of the wall in the last row of blocks just below the floor level, thus preventing water from reaching the floor level.
A perforated drainage tile is installed in the trench and tied to the sump basin. This is then covered with gravel to about four inches from the surface, which is then filled with concrete that is crushed and finished. A plastic shield is placed in front of the weep holes to prevent them from becoming clogged when new cement is installed. For embankment walls of clay, brick, stone and earth tiles, a .050 or heavier high-impact styrene, stucco, fiberglass or similar wall sheathing is installed 4′ or 8′ (to the top of the wall). of the wall) around the basement.
