Insulated Drainage Panels are a type of geofoam material generically known
as glued polystyrene porous block. The GeoTech Insulated Drainage Panel
is a geocomposite which serves as a sheet-drain that consists of two geosynthetic
materials: a geofoam and a geotextile.
Tested according to ASTM standards and the Department of the Army Corps
of Engineers Laboratory Soils Testing Manual (EM 1110-2-1906, Appendix
VII), the drainage panels have exhibited excellent performance characteristics.
They provide permanent, permeability efficiency which is maintained to
depths of up to 40 feet (e6.55m) and with lateral pressures of up to
1,600 lbs/ft (80kPa).
With the costs of construction and energy continuing to escalate, the
necessity to make all building space environmentally habitable and energy
efficient is paramount. Realizing that buildings leak both water and energy,
GeoTech Insulated Drainage Panels were developed to offer the following
- Relief of hydrostatic pressure
- Protects waterproofing system and structure from damage during backfill
- Will not puncture, deform or injure critical waterproofing membranes.
- Adds substantial insulation value (R=3.5 per inch - dry, ASTM C-518)
to below-grade interior space.
- Reduces potential of condensation by moving the dew point to the exterior
of the wall.
- Lightweight, factory-fabricated panels handle and install easily resulting
in time and labor savings.
- Helps protect against frost heave and stress from expansive soil movements.
- Requires no special storage areas or equipment for installation.
- No mechanical fastening necessary.
- No longer necessary to depend on site labor for construction of hydrostatic
pressure relief system.
- Inspector can make quick visual check and be assured of proper installation.
- Uniform thickness and quality assures predicable drainage characteristics.
and Materials:GeoTech Insulated Drainage Panels are composed of
high quality expanded polystyrene (EPS) beads. The EPS beads are glued
together with a specially developed waterproof, asphalt adhesive and molded
into blocks. The blocks are then cut into panels of various thicknesses.
The radius to radius bonding creates channels that allow free passage
of ground water and produces excellent permeability ratings.
The panels typically have a geotextile factory laminated to one side
of the board. A vapor retarder such as PVC, foil, polyethylene sheeting,
EPS, etc., can also be added to the interior face of the drainage panel,
if required. This protects the building from condensation, provides a barrier
to pour concrete against in sheeting and shoring applications or adds
to the U-value of the structure.
GeoTech Insulated Drainage Panels have a standard size of 48" x
48" and can be specified in standard thicknesses of 1.5", 1.0",
2.0", 3.0", 4.0" or up to 24" depending on project
specific requirements. Special shapes or other thicknesses are available,
contact local manufacturer/distributor or GeoTech Systems Corporation
for specific capabilities.
Applications: GeoTech Insulated Drainage
Panels are recommended for use over the waterproofing material on below-grade
foundation walls or roof systems. Highway or landscaping retaining walls,
interior or exterior planters, pedestrian pavers, and other critical applications
where ground water may present a problem now or in the future, are also
excellent uses for GeoTech Panels. In areas where energy conservation or
water condensation may be a design consideration, the insulation properties
of the GeoTech Panels present real benefits to the owner at no additional
Limitations: To function as intended, GeoTech
products must be used in conjunction with a perimeter hydrostatic pressure
relief system. They should not be installed under surfaces subject to
heavy point loading and should not be exposed to petroleum solvents, fuels
or uncured solvent-based waterproofing or damp-proofing material.
Waterproofing membranes should be adequately cured so as not to interfere
with the subsequent adhesion of GeoTech Drainage Panels. Compatibility
with the surrounding soil composition should also be determined to ensure
EPS materials (including GeoTech Drainage Panels) should be considered
combustible when directly exposed to flame. They should not be installed
or stored near an open flame or other source of ignition.
Product in Place: The serious and costly problem of keeping below-grade
structures free of water and condensation is greatly reduced by incorporating
GeoTech Insulated Drainage Panels into the initial total system design.
By relieving hydrostatic pressure from the subsurface wall or roof, the
waterproofing system specified is permitted to function as designed. Additionally,
the waterproofing membrane and structure is protected during the backfill
operation. Safety factors for structural loading are also increased due
to lower stress on the walls. This is especially true in horizontal underground
roof applications. By replacing the gravel filtration medium with GeoTech
panels, hydrostatic pressure is reduced as well as the weight of the gravel
on the structure.
Problems associated with condensation are reduced due to the insulating
qualities of the GeoTech panels. The energy requirements necessary to
maintain a comfortable environment are also reduced, thus creating a return
on investment for the owner at no additional cost.
GeoTech Insulated Drainage panels also provide a conduit for the transmission
of ground-borne gasses such as radon and methane away from below-grade
- Density/Weight: 2.0 pcf nominal
- Coefficient of Permeability: 1.24 cm/sec (ASTM D-2434)*
- Hydraulic Transmissivity: Approximately 12 gpm at 4" thickness.
Radial flow to gravity well - 10' radius.
- Thermal Conductivity: K=0.285 (dry) @ 75°F (ASTM C-518)
- Thermal Resistance: R=3.5 (dry) @ 75°F (per inch of thickness
- Compression Strength: Under short term loading, compression of approximately
800 psf (40 kPa) will result in a 10% deformation (ASTM D-1621-73).
- Under installed conditions, pressure of 1200 psf (57 kPa)(equivalent
to ground pressure at a depth of 50 feet with an equivalent fluid pressure
of 40H psf), will result in compression of approximately 30%.
- Stability: GeoTech products are permanently resistant to moisture,
including total immersion, and are unaffected by normal acidic or aklylinic
*Tested under compression according to Department of the Army Corps
of Engineers Lab, Soils Testing Manual (EM 1110-2-1906, May 1980) Appendix
For foundations or retaining walls below-grade, attach Drainage Panel
to the wall after installation of the waterproofing system. Place six daubs
of an approved adhesive as required by Architect/Engineer on the board surface and press onto vertical
surface with the filter fabric placed toward the earth.
panels are furnished with a 2" minimum fabric lap joint. Installation
should begin at the perimeter drain. When applying to walls, butt sheets
together and stagger vertical joints. All outside or inside corners should
be lapped with the full thickness of the board. If field applying geotechnical
fabric over panels, follow fabric manufacturer's recommendations regarding
the amount of overlap at joints.
Field cutting of the Drainage Panel is accomplished with a handsaw. For
walls placed directly against sheeting or shoring, Drainage Panel must
be secured by adhesive and/or mechanical fastening prior to placement
of concrete or masonry. A polyethylene separator sheet should be installed,
thus blocking the migration of concrete into the Drainage Panel. Sleeves
(4" min.) spaced at 20 foot centers must be provided through the
foundation wall beneath the floor slab to provide through-drainage to
the interior hydrostatic pressure relief system.
For planter boxes, etc., apply Drainage Panel to bottom and or side surfaces
with sufficient amount of OSI QB-300 (or equal) adhesive to prevent dislodging
during placement of earth. Ensure that filter fabric side faces the soil.
Adhesives specified other than GeoTech products should be checked for
compatibility with the Drainage Panel.
Availability and Cost: GeoTech products are
available nationally. Material costs vary depending on thickness and,
if necessary, the type of geotextile laminate applied. For pricing and
delivery contact GeoTech Systems Corporation, P.O. Box 1045, Georgetown Pike,
Great Falls, Virginia 22066, (703-759-0300).
Warranty: GeoTech Systems Corporation warrants
for a period of 5 years that the Drainage Panel will be free of manufacturing
defects. The company will, at its option, either replace any material
proven to be defective or refund the purchase price of the material. GeoTech
Systems Corporation does not assume any other liability, direct or indirect,
nor any consequential damages.
THE ABOVE WARRANTY IS OFFERED IN LIEU OF ALL OTHERS, IMPLIED OR EXPRESSED,
AND MAY BE MODIFIED OR EXTENDED ONLY IN WRITING BY CORPORATE OFFICERS
OF THE COMPANY.
Maintenance: GeoTech Insulated Drainage Panels
require no maintenance once installed.
Technical Services: Complete technical services
are available from GeoTech Systems Corporation and its licensed manufacturers
or distributors. Services include assistance during the design and specifications
stages. Sales representatives can also work with the contractor through
the initial stages of application to assure proper installation.