Interior waterproofing covers a variety of solutions ranging from digging the perimeter of the basement and installing floor drain tiles and a sump pot and pump, to installing a baseboard with drain holes to release water from the block to floor level. and channel it to a drain, to waterproof paints and sealants.
Interior drain tile installation is the most common form of basement waterproofing. A sump pump alone is sufficient to release the hydrostatic pressure of a high water table (imagine a glass upside down in the water) in some cases if the water is mainly on one side or near a corner. This solution does not waterproof the base, which can only be done on the outside by opening the exterior walls to footer level and applying a waterproof barrier. However, it releases the pressure of the water at a point below the floor and prevents it from reaching the upper walls and the floor seam where it often seeps, thus providing a dry basement.
The concrete is broken about ten inches from the wall and a trench about thirty inches deep is dug around the basement or next to the wet wall. Care must be taken to leave solid concrete spacers against the wall approximately every five feet (which is tunnelled underneath to install the drain tile) to ensure that the wall does not release its support from the floor and collapse. Drainage holes (small holes drilled in each cavity of each cinder block) to release water from the block are installed at the base of the wall in the last row of blocks just below floor level, thus preventing water from reaching at floor level.
The perforated drain tile is installed in the trench and tied to the sump vessel. This is then covered with gravel to about four inches from the surface which is then filled with concrete that is smoothed and finished. A plastic protector is placed in front of the drain holes to prevent clogging when new cement is installed. For high impact ceramic, brick, stone and earth embankment walls. 050 or heavier, styrene, stucco, fiberglass, or similar wallcovering installs either 4 ‘or 8’ (up to the top of the wall) around the basement.