Drainage Specialists BC


Drainage Specialists
Dual perimeter drainage for your home, garden or commercial property

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Dual Perimeter Drainage Installation

Most older homes have old clay drain tile as their perimeter drainage. Over time the clay drain tile decays, cracks and even has tree roots growing through which ceases the drain tile to work properly and carry the water away from your home.

If you are experiencing a leaky basement, chances are that this is the cause.

We provide a complete inspection of your existing drain tile, and the solution to bring it up to date for the long term and fully certified.

The steps in installing a fully functional drainage system is to instal a dual drainage system, with a proper membrane system for your homes foundation wall.

What is Dual Perimeter Drainage?

Dual Perimeter drainage is the installation of 2 PVC piping systems around the perimeter of your home.

The first piping system is placed at the base of your foundation walls footing (or 4 inches below your basement floor or crawl space), this is to collect and carry away ground water. For this we use 4 inch perforated PVC piping.

The second PVC piping system is placed 4 - 8 inches below the land grade and connected to your roof down spouts, this is carry your roof water. For this we use 4 inch solid PVC piping.

The importance here is that the 2 piping systems are seperate.

In addition to installing the drainage system, we also instal 2 - 4 "clean-outs" at each corner of your home, giving you access to the drain pipes, for future cleaning.

Let's walk through the steps of installing dual perimeter drainage

Trenching for Perimeter DrainageDigging the Trench

Firstly, we must dig a trench down to your foundation wall footing, to expose the entirety of the concrete foundation wall, and remove the old drain tile.

We often use mini excavators for this, however in confined areas, the trench must be dug by hand.
Additionally, if the foundation wall is more than 4 feet in depth from ground level, we must set up up shoring, to ensure safety when installing when working in the trench.

Pressure Wash Foundation WallCleaning the Foundation Wall

Secondly, we pressure wash the entire concrete foundation wall free of all dirt, debris and oils.

This is to ensure the membrane system will adhere to the foundation wall surface.

Additionally, after inspection, if cracks are found in the foundation wall, we repair cracks with a high density concrete compound, prior to applying the waterproofing system.

Waterproofing Foundation WallWaterproofing Membrane

After the foundation wall is completely clean and dry, we next apply our Waterproofing Membrane system, from the foundation footing to the top of ground level.

If your budget allows, we apply 2 coatings, with a layer of fibre-glass fabric inbetween, for the ultimate in longevity.

Dual Drainage InstallationDual Drainage Installation

After allowing the membrane to completely dry for up to 24 hours. We then proceed to instal the dual drainage system.

Again, perforated 4" PVC pipe is placed at the base of the foundation footing, or 4" below the basement floor, or crawl space. This is to catch and carry away the ground water.

The 4" solid PVC piping is placed from 4 - 8 inches below the ground surface and is used for your roof water down spouts.

We instal several "clean outs" for easy access to the drainage system at a later date. Additionally, all fittings are primed and glued and the system is tested for accuracy prior to back-filling.

Drain Rock and Filter Cloth for DrainageDrain Rock and Filter Cloth

After the piping system has been tested, we next cover the pipes with a minimum of 12 inches of clear crush (or round rock) drain rock, and commcercial grade filter cloth.

Clear crush or round drain rock is used to allow the water to follow a path directly to the drainage system.

Commercial grade filter cloth is used as a barrier from back fill materials and the drain rock. It's purpose is to keep soils and dirt from clogging the perforated PVC pipe.

Backfilling drainage trenchBack Filling

The final step to installing a dual perimeter drainage system is to back fill the trench.

After all is tested and functioning accurately, it is now safe to back fill, re-level and clean the entire area of construction debris.

You now have a fully functional perimeter drainage system complete with our warrenty.

Selecting a qualified drainage contractor for your home or commercial project is important.
Contact us for an estimate anytime.

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