If a portion of your structure is built below-grade, usually in hillside areas, the structure relies on a foundation waterproofing system to keep water out of the living space. If water is entering the structure below-grade, the waterproofing may be missing or failing. Give us a call to find out more.
In order for a waterproofing system to work properly, it must be installed from the outside, on the "positive pressure" side. Once the water has made its way through the concrete, it's too late. Any coatings applied to the "negative pressure" side (inside the structure) will eventually fail, if they even worked at all.
Proper foundation waterproofing starts by excavating a trench at the area to be waterproofed down to below the level of the floor. The surface of the foundation is prepped, sand blasted if needed, and waterproofed with a polyurethane sealant, however this is only the beginning, see below for more.
Once the wall is "waterproofed" with polyurethane, a path needs to be provided for the water in the ground to escape. This starts with a sheet drain that both protects the waterproof membrane and allows the water to flow to the sub-drain.
Water collected by the sheet drain travels through a sub-drain system consisting of a perforated pipe in a gravel pocket, wrapped in fabric. This sub-drain then has to run downhill to an exit point, whether naturally or via a pump system.
Yes, building permits are required for foundation or basement waterproofing. These also provide proof to future buyers of the home that the work was done properly and inspected. Foundation Repair LA Inc will take care of the building permit process from start to finish.