There are times the term is confused with footing drain and perimeter drain. The former is basically installed outside the house near the foundation walls while the latter is installed indoor.
The primary function of a French drain, either set up externally or internally, is to secure your basement from flooding.
It directs unwanted water far from the foundation.
Advantage
Outside French drains might work fine for a number of years depending on website condition, setup process and maintenance. Interior French drains are low-cost and easy to install as long as there's an enough power supply and building pit for a sump pump.
Disadvantage
Exterior French drains need a lot digging and there are times garden beds, bushes, decks, walkways and porches ought to be gotten rid of. Interior French drain expenses less but it will certainly not work successfully if it's only set up with a normal sump pump.
Vulcan Waterproofing employs a service, which is called a hydrostatic pressure relief system. It involves cutting a trench in the floor around the perimeter of the basement near to the foundation walls.
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