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Below-Grade Drainage

Delta Drain Drainage Boards

High-capacity dimple/drain board for foundations and decks — controls below-grade water and relieves hydrostatic pressure on vertical and horizontal applications.

Delta Drain is a dimple/drain board that controls the flow of below-grade water. These drainage composites have high water-flow capacity to ensure effective drainage and relief of hydrostatic pressure buildup. Delta Drain can be used on both horizontal and vertical applications for residential and light commercial uses.

Delta Drain Drainage Composite
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7
Delta Drain Drainage Composite - 6' x 65'7

Delta Drain Drainage Composite - 6' x 65'7"

$1,077.31
Delta Drain Drainage Composite
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7
Delta Drain Drainage Composite - 8' x 65'7

Delta Drain Drainage Composite - 8' x 65'7"

$667.09
Delta Drain 2000 HI-X
Delta Drain 2000 HI-X - 4' x 50'
Delta Drain 2000 HI-X - 4' x 50'
Delta Drain 2000 HI-X - 4' x 50'
Delta Drain 2000 HI-X
Delta Drain 2000 HI-X - 4' x 50'
Delta Drain 2000 HI-X - 4' x 50'
Delta Drain 2000 HI-X - 4' x 50'

Delta Drain 2000 HI-X - 4' x 50'

$301.22
Delta Drain 2000 HI-X
Delta Drain 2000 HI-X - 6' x 50'
Delta Drain 2000 HI-X - 6' x 50'
Delta Drain 2000 HI-X - 6' x 50'
Delta Drain 2000 HI-X
Delta Drain 2000 HI-X - 6' x 50'
Delta Drain 2000 HI-X - 6' x 50'
Delta Drain 2000 HI-X - 6' x 50'

Delta Drain 2000 HI-X - 6' x 50'

$516.41
Delta Drain 6000 HI-X
Delta Drain 6000 HI-X - 4' x 50'
Delta Drain 6000 HI-X - 4' x 50'
Delta Drain 6000 HI-X - 4' x 50'
Delta Drain 6000 HI-X
Delta Drain 6000 HI-X - 4' x 50'
Delta Drain 6000 HI-X - 4' x 50'
Delta Drain 6000 HI-X - 4' x 50'

Delta Drain 6000 HI-X - 4' x 50'

$313.00
Delta Drain 6000 HI-X
Delta Drain 6000 HI-X - 6' x 50'
Delta Drain 6000 HI-X - 6' x 50'
Delta Drain 6000 HI-X - 6' x 50'
Delta Drain 6000 HI-X
Delta Drain 6000 HI-X - 6' x 50'
Delta Drain 6000 HI-X - 6' x 50'
Delta Drain 6000 HI-X - 6' x 50'

Delta Drain 6000 HI-X - 6' x 50'

$534.08
Delta Drain 6200 HI-X
Delta Drain 6200 HI-X - 4' x 50'
Delta Drain 6200 HI-X - 4' x 50'
Delta Drain 6200 HI-X - 4' x 50'
Delta Drain 6200 HI-X
Delta Drain 6200 HI-X - 4' x 50'
Delta Drain 6200 HI-X - 4' x 50'
Delta Drain 6200 HI-X - 4' x 50'

Delta Drain 6200 HI-X - 4' x 50'

$326.33
Delta Drain 6200 HI-X
Delta Drain 6200 HI-X - 6' x 50'
Delta Drain 6200 HI-X - 6' x 50'
Delta Drain 6200 HI-X - 6' x 50'
Delta Drain 6200 HI-X
Delta Drain 6200 HI-X - 6' x 50'
Delta Drain 6200 HI-X - 6' x 50'
Delta Drain 6200 HI-X - 6' x 50'

Delta Drain 6200 HI-X - 6' x 50'

$554.07
Delta Drain 9000 HI-X
Delta Drain 9000 HI-X

Delta Drain 9000 HI-X

$632.66
Delta Drain Grip Fastener
Delta Drain Grip Fastener

Delta Drain Grip Fastener

$151.51
Delta Drain Mold Strip
Delta Drain Mold Strip

Delta Drain Mold Strip

$133.50
Delta Drain Screw Fastener
Delta Drain Screw Fastener

Delta Drain Screw Fastener

$67.35
Delta Drain T-FASTner
Delta T-FASTner
Delta T-FASTner
Delta Drain T-FASTner
Delta T-FASTner
Delta T-FASTner

Delta T-FASTner

$28.43
Delta Drain Sealant
Delta Drain Sealant

Delta Sealant

$25.54
Delta MS Flash - 2
Delta MS Flash - 2

Delta MS Flash - 2" x 6' - 33 Strip Bundle

$108.64
What It Is

What Is Delta Drain?

Delta Drain is a two-layer dimple board — a below-grade drainage composite from Cosella-Dörken that controls the flow of water against foundation walls and decks. The molded HDPE core creates an air gap that channels water down to the footing drain, while a heat-bonded Typar® geotextile keeps soil out of the drainage path.

The result is a foundation drainage board with high water-flow capacity that relieves hydrostatic pressure and protects the waterproofing layer during backfill — on both vertical and horizontal applications, for residential and light commercial construction. Every Delta Drain roll, fastener, and accessory on this page ships free.

The Range

The Delta Drain Product Line

This collection carries the full Delta Drain range, from standard drainage composite rolls to the high-performance HI-X series. Match a Delta Drain product to your application, then open the listing for exact dimensions and pricing.

Delta Drain ProductRoll WidthsBest For
Delta Drain Drainage Composite6' & 8' wideStandard below-grade foundation drainage board
Delta Drain 2000 HI-X4' & 6' × 50'Vertical foundation walls
Delta Drain 6000 HI-X4' & 6' × 50'Higher-flow wall and deck drainage
Delta Drain 6200 HI-X4' & 6' × 50'Heavy-duty drainage applications
Delta Drain 9000 HI-XRollMaximum-flow plaza and deck drainage

Delta Drain grip fasteners, screw fasteners, T-FASTners, mold strips, sealant, and flashing are stocked here too — complete a Delta Drain installation with matching accessories.

Why It Works

Why Choose Delta Drain

A poor waterproofing system lets hydrostatic pressure build up, cracking foundations and driving water inside. Delta Drain is the most effective drainboard for controlling below-grade water, with the flow capacity for excellent drainage across nearly all residential and light commercial applications.

High-flow HDPE core

The molded drainage core lets incoming water drain freely to the footing perimeter and relieves hydrostatic pressure.

Backfill protection

The dimple pattern delivers high compressive strength and shields the waterproofing membrane during backfill.

Won't-rot geotextile

Heat-bonded Typar® is thermally welded to the dimple crowns for superior filtering and no clogging.

60% recycled, virgin-faced

A recycled HDPE core protected by virgin HDPE outer layers resists oxidation, acidic soils, and stress cracking.

Largest rolls on the market

6' and 8' wide rolls mean faster installation with fewer seams and overlaps, vertical or horizontal.

Code approved

Approved under National Building Code CCMC 13209-R.534 for below-grade drainage.

Delta Drain dimple board installation
Delta Drain Dimple Board Installation
Delta Drain dimple board vertical application
Delta Drain Vertical Application
The Build

How Delta Drain Is Made

The Delta Drain dimpled membrane is made of special high-density polyethylene (HDPE) and polypropylene (PP) non-woven Typar® geotextile. The HDPE drainage core is designed with a dimple pattern for high compressive strength and excellent drainage.

It is manufactured with an exclusive co-extrusion method: 60% recycled HDPE in the middle, with two thin virgin-HDPE layers on the outside that guard the recycled core against oxidation and environmental elements such as acidic soils or alkalinity. The finished board is a two-layer geocomposite — a drainage core that carries water freely to the footing perimeter drain, bonded to a heat-bonded PP geotextile that will not rot, absorbs water, and keeps the flow passages from clogging.

Delta Drain has multiple attachment options
Delta Drain Has Multiple Attachment Options
Delta Drain drainage board on the jobsite
Delta Drain on the Jobsite
Installation

How to Install Delta Drain

  1. 1
    Apply waterproofing first. Delta Drain is installed over liquid or sheet-applied waterproofing on the foundation wall.
  2. 2
    Unroll dimples to the wall. Run the dimple board up against the wall with the dimpled side facing in toward the structure.
  3. 3
    Set the top at grade. Install the top edge of the drainboard at grade level and fasten with grip, screw, or T-FASTners.
  4. 4
    Drain to the footing. Place the bottom edge close to the perimeter footing drain so water exits freely; finish terminations with mold strip and sealant.
Questions

Delta Drain FAQ

What is a dimple board?

A dimple board is a dimpled plastic drainage membrane installed against a foundation wall. Delta Drain is a dimple board with a molded HDPE core and a bonded geotextile: the dimples create an air gap that lets water drain freely down to the footing, while the fabric keeps soil out of the drainage path.

What is Delta Drain used for?

Delta Drain is used to manage below-grade water on foundation walls, retaining walls, plaza decks, and planters. It relieves hydrostatic pressure, protects the waterproofing membrane during backfill, and drains water to the perimeter footing drain on both vertical and horizontal applications.

How do you install Delta Drain on a foundation?

Unroll Delta Drain dimples-against-the-wall over your applied waterproofing, set the top edge at grade level, and run the bottom edge to the perimeter footing drain. Fasten and lap per the installation guide, using Delta Drain grip fasteners, screw fasteners, or T-FASTners.

What sizes does Delta Drain come in?

Delta Drain drainage composite comes in 6-foot and 8-foot wide rolls — the largest drainboard on the market — and the HI-X series (2000, 6000, 6200) is stocked in 4-foot and 6-foot widths in 50-foot rolls, with the 9000 HI-X for maximum-flow applications. Open any product listing for exact dimensions.

Where can I buy Delta Drain?

You can buy Delta Drain here at Overlake Supply. Every Delta Drain roll, fastener, and accessory on this page ships free on all orders. If you need volume pricing on a large quantity, use the quote request page for a written quote.

Where is Delta Drain made?

These products are made and shipped from Ontario, Canada.