FRENCH DRAINS
Beverly Hills
Why Are French Drains Necessary?
Foundation leaks, Basements leaks, Crawl space leaks
Licensed Certified Drainage Technicians
- French drains are designed to channel below grade water against foundation away from your residence.
- Rain runoff from roof, roof gutters, and down spouts can pour hundreds of gallons of water saturating the below grade soil against your foundation creating hydrostatic pressure.
Foundation Drainage Prevents Leaks
- Below grade hydrostatic pressure against the foundation forces water by capillary action into exterior concrete cracks, and voids causing foundation leaks and elevated interior moisture.
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10 Year Warranty For French Drain Installations
Foundation Leaks Create Mold Growth
- Foundation, basement, and crawl space leaks elevate interior moisture, humidity levels creating indoor mold growth.
IICRC Certified Eco-Friendly Mold Removal
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Foundation French Drain Installation
WARNING!
- French Drain Must Be Positioned Below The Top of Footing To Prevent Hydrostatic Pressure.
- Architectural Specifications Require Positioning French Drain Below The Top of Footing.
Image Below Shows French Drain In Correct Position
- Most of the competitors DO NOT position french drain below the top of footing due to the additional excavating and preparation work involved.
- Before Selecting CONTRACTOR, CAREFULLY INSPECT Images, And Work of Competitors French Drain Installations.
Foundation leaks, Basement Leaks, Crawl Space Leaks
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- French drains “perforated drain pipes” are designed to collect and discharge below grade ground water at footing location.
- Positioning french drain level below top of foundation footings, lowers the water reservoir elevation.
- Minimizing the water reservoir also reduces hydrostatic pressure to footing and foundation.
Elevated hydrostatic Pressure Increases Potential For Foundation Leaks
- Pea gravel applied 4” under french drain perforations “weep holes” to allow water to percolate into french drain weep holes sloping to discharge location.
- Pea gravel filters the ground water of silt and sediment prior to percolating into the french drain weep holes to prevent clogging of drainage system.
Crack Resistance Schedule 40 Foundation French Drain
Rigid French Drains Prevents Deflection Necessary To Provide Correct Sloping.
WARNING!
- Deflections In French Drains Will Create Pooling of Water In French Drain And Affect Drainage Flow.
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- Excavating 8” below top of foundation footing allows clearance for applying a 4” gravel bed layer and positioning the 4” diameter french drain level with top of footing.
- Additional gravel is applied 6” above top of french drain filtering the below grade ground water prior to percolating into french drains perforations.
- French drain perforations “weep holes” are positioned downward in gravel bed allowing water percolation into perforations.
- Reducing the volume of standing water at base of footing prevents hydrostatic pressure and water migration under footing and slab locations.
Correct French Drain Positioning At Footing Base
Prevents Water Build-Up At Foundation Elevation.
- The purpose of foundation drainage is to reduce below grade water levels to a minimum, foundation water intrusion, indoor moisture, and humidity.
WARNING!
- Some waterproofing contractors position french drain on top of footing raising the water table elevation necessary for for foundation drainage.
- Positioning french drain on top of footing creates higher reservoir of below grade standing water at base of footing.
- The goal of foundation drainage is to REDUCE below grade water levels preventing hydrostatic pressure to foundations, basements, and crawl spaces.
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French Drain Wrapped With Filter Fabric
Filter Fabric Edges Are Sealed to French Drain With Waterproofing Tape
- Filter fabric edges are sealed to prevent sediment, soil, and silt from clogging french drains.
- Allows below grade ground water in gravel bed to percolate through filter fabric and into french drain perforations "weep holes".
- Geo textile filter fabric wrapped three layers around "perforated drainage pipe" french drain preventing soil sediment infiltration.
- Soil silt and sediment contaminated ground water is filtered through the gravel bed where soil and sediment settles at base of gravel bed 4" below french drain allowing filter water to percolate through the french drain perforations wrapped with filter fabric.
- Foundation waterproofing protected with drainage panels and the correct french drainage system reduces hydrostatic pressure created by below grade saturated soils conditions.
Foundation Drainage Change in Elevation
Foundation Drainage Required to Mirror Step Foundation Profile.
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Proven Results, Guaranteed Effective Foundation Drainage!
- Hill side footing transitions waterproofing membrane and drainage panels installed prior to step footing drainage.
- Ridge schedule 40 foundation drainage prevents deflection, cracking, and collapsing.
- Most waterproofing contractors install a thiner grade drain increasing risks of deflection, cracking, and collapsing.
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Step Foundation Drainage Change In Elevation
Drainage Panels Outline The Future Concrete Step Profile
- Drainage panels allows below grade ground water to flow freely through the geo textile filter fabric.
- Drainage panels applied over foundation waterproofing and footing detail allows for water to flow to reservoir below the top of footing elevation.
- Allows water to percolate into french drain weep holes discharging at curb or sump pump location.
- Schedule 40 perforated drain pipes resists deflection, cracking due to the increased stress of french drain joint connections.
- The increased stress to french drain joint connections in step footing installations require commercial grade schedule 40 perforated french drains to prevent cracking due to increased stress.
Warning!
- Flexible perforated drain pipe set on gravel bed will not maintain a level position flush with top of footing.
- Flexible drain will settling in gravel bed creating low dips allowing standing water and soil sediment to accumulate affecting gravity water flow and drainage.
Foundation Drainage Down Spout Connection
Walkway Surface Drain Connection To Separate Drainage
- Separate drainage system required for roof down spouts and surface drains and must be connected to french drains
- Down spouts connected to separate foundation drainage system captures the roof water run off and allows for discharge at curb location
- Walkway surface drain connected to separate foundation drainage system collects and drains the walkway surface water runoff
Prefabricated Down Spout Connection
Down Spout Connection To Separate Drainage System
- Separate below grade drainage pipes required roof down spouts and surface drains.
- Down spout connected to foundation drainage allows roof rain water discharge at curb location.
- Prefabricated down spout end connection is fabricated round allowing for insertion into drainage pipe.
Walkway Surface Drain
Walkway Surface Drain Connected To Foundation Drainage
- Controlling roof water runoff by connecting down spouts and surface drains to below grade drain age system discharging at curb or sump pump location.
- Controlling down spout runoff reduces below grade ground water against foundation and related hydrostatic pressure on foundation waterproofing membrane.
French Drain Positioned 20” Higher Then Correct Position.
- End of french drain visible, drain was cut and removed to complete excavations to footing.
- High moisture, humidity levels in crawl space caused by french drain positioned higher then footing.
- Recently constructed in 2011, the two year old Santa Monica residence experienced high levels of below grade ground water creating hydrostatic pressure due to the french drain elevation position.
- Foundation leaks raised the crawl space moisture, and humidity levels resulting in crawl space mold contamination to floor joists and insulation installed between the floor joist.
- Detailing and surface preparation required removal of concrete overburden to footing.
- Removing overburden necessary to correctly position french drain flush with top of footing.
- The footing overburden creates a channel along foundation, preventing ground water from migrating to gravel bed below footing.
- Detailed footing allows for water drainage to gravel bed below footing and create adequate slope for french drain drainage.
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Footing Restoration Required Prior to French Drain Installation
- Footing overburden removal includes surface concrete grinding horizontal top of footing for correct footing, waterproofing, drain panel installation over foundation and footing prior to french drain positioning.
- Correcting footing profile requires surface grinding “horizontal” top of footing and squaring off out side edge.
- Correct profile allows placement of french drain along base of footing.
- Correct profile also allows for 1/4” slope per foot for drainage.
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French Drain 18” Above Correct Position
New French Drain To Be Positioned Flush With Top of Footing.
Footing Concrete Repairs Necessary To Fill Voids With Rapid Set Cement.
- Incompetent foundation footing installation, footing forms were not used when poured to create square detailed profile.
- Footing profile requires waterproofing membrane and drainage panels prior to french drain installation.
Foundation Drainage, Waterproofing Problems?
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Replacement French Drains Wrapped In Filter Fabric
- Drainage Panels Installed Over Foundation Waterproofing And Footing Profile.
- French drain rapped with filter fabric prevents soil and sediment from clogging the drainage system.
- French drains installed below top of footing creates a drainage reservoir below the foundation and reduces hydrostatic pressure to foundation membrane.
Advantages of positioning drain along footing
- Positioning french drain along footing allows adjustments of 1/4” sloping for gravity flow of below grade ground water to discharge location.
Warning!
- Some contractors install french drain on top of footing with no sloping at all.
- Sloping a 10 foot section of french drain would require raising drain 2.5” per 10 foot section of drainage.
- A 40 foot section of drain would require raising drain 10” above footing elevation creating hydrostatic pressure to foundation waterproofing.
- Maintaining a low water reservoir for water percolation into drain prevents hydrostatic pressure.
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French Drain Positioned Flush With Footing
- Foundation / footing drainage panels allows below grade water to migrate through filter fabric to footing unrestricted.
- Allows water to percolate into french drain perforations through french drain wrapped in filter fabric.
- Positioning drain along footing allows for 1/4” per foot adjustment in slope.
- For each 10 foot section of drain installed a 2.5”drain slope is required.
New French Drain Installation
Foundation Leaks, Basement Leaks, Crawl Space Leaks.
Filter fabric prevents sediment build up restricting drainage water flow.
- Foundation ground water must percolate into french drain perforations for correct drainage.
- Minimum 1/4” per foot sloping allows for gravity flow of water to discharge location.
- French drain gravel bed covered in filter fabric allows for ground water drainage into drain perforations.
- Architects specify this drainage process for new construction.
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Certified Drainage Technicians
Curb Core For French Drain
- Providing 1/4” slope per foot of Drain Pipe Allows For Gravity Flow of Water To Discharge Curb Core Location.
- French drains are only used along the foundation perimeter and transitioned to solid drain pipes to street curb.
WARNING!
- Some contractors drill core flush with bottom of curb restricting drainage flow during rain storms due to street curb water runoff.
- The curb core must be positioned 3/4” above the base to allow water to flow out and prevent back flow into drain pipe.
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