Interior Drain Tile System
Our drain tile system is based on the core aspects of what all warranty-able systems have in common. No bells and whistles, just a solid and reliable system. It's simple, straightforward and clean. It can be installed with any type of foundation, with any floor condition and around almost all existing basement finishings. There is little or no impact on how the basement can be later finished. There is no disruption of landscaping and it addresses both foundation seepage and rising ground water, which an exterior system and many newer interior systems do not. There is really no other type of post-construction waterproofing system that can permanently guarantee against water intrusion.
In most cases, we would use an electric jackhammer for our cutting. We find that it creates less dust than a concrete saw and leaves a rough edge for the later concrete patch to bind into. The cut will be wide enough to expose the footing, plus about six inches. We then excavate a trench to the base of the footing or about 10 inches in depth. The resulting dirt and concrete debris, will be hauled out and disposed of.
A four-inch drain tile pipe, perforated with drainage slits, is then placed in the trench. The pipe is made from High-Density Polyethylene (HDPE). This versatile product is used in field drainage, landscaping, highway construction and many other areas. The drain tile is surrounded with an aggregate filter bed, which allows water in, while filtering out the surrounding soil.
We then install a drainage panel, made from the same material as the drain tile, against the foundation wall. Raised studs on one side of the panel, provide a "sweat gap" between the wall and the basement floor. This gap extends down into the aggregate filter bed. Any water that may seep through the base of the foundation, is channeled down through the aggregate and into the drain tile.
Providing a sweat gap is a step that is often missed
Any time joining concrete sections are poured at different times, it creates a "cold joint". Although joined tightly together, there is a seam created that can allow water to seep through. Simply installing drain tile alone will not address this issue. There must be a drain gap allowing a path for cold joint seepage. This is a step frequently missed when a drain tile system isn't installed by an actual waterproofing contractor.
Sump Basin / Pump
By sealing the drain tile system and applying a slight vacuum pressure to it with a specialised fan, we can create a negative pressure beneath the basement floor. Slab depressurization can dramatically reduce water vapor and soil gas intrusion. You can eliminate the need for dehumidifiers. If there is a radon issue, it can reduce radon to outdoor air levels. Sub-slab Depressurization can be easily added to a drain tile system installation. See Radon Mitigation