Spycor Building Products stocks four below-grade moisture barrier systems. DELTA-MS is the standard residential dimpled membrane, rated to 12 ft below grade with 5,200 psf compressive strength. DELTA-DRAIN steps up drainage capacity for higher water tables. DELTA-TERRAXX is the commercial/deep-excavation system at up to 8,900+ psf. Platon is a comparable HDPE dimpled membrane, most often used for basement subfloor moisture isolation rather than vertical foundation wrapping. All four ship in-stock from Spycor Building Products.

Water — not fire, not wind, not settling — is the leading cause of foundation damage in North America. Every below-grade wall is under constant hydrostatic pressure from groundwater, snowmelt, and surface runoff, and once that pressure finds a crack, tie hole, or honeycombed patch in the concrete, it doesn't stop on its own. A below-grade moisture barrier is the layer that intercepts that water before it reaches the wall, channels it down to the footing drain, and keeps your basement, crawlspace, or below-grade commercial space dry for the life of the structure.

Since 2006, Spycor Building Products has hand-selected moisture management systems from manufacturers with a proven track record — Dörken's DELTA line and Armtec's Platon among them — rather than carrying every option on the market. The Below Grade Moisture Barriers category reflects that: four systems, each suited to a specific application, all in stock. This guide breaks down how they differ and which one fits your project.

What a Below-Grade Moisture Barrier Actually Does

Dimpled membrane systems work differently than a spray or paint-on coating. Instead of trying to form a perfect, uninterrupted seal (which cracks the moment the concrete does), a dimpled HDPE sheet creates a physical air gap between the soil and the foundation wall. Any water that reaches the membrane falls freely down that air gap to the footing drain instead of pressing against — or soaking into — the wall. Because the membrane isn't bonded to the concrete, it also permanently bridges cracks, tie holes, and honeycombing that would defeat a coating.

That's the mechanism behind all four products Spycor Building Products carries in this category. The differences come down to compressive strength, whether a geotextile filter fabric is bonded on, and how deep or how loaded the application is.

The 4 Systems Spycor Building Products Stocks

DELTA-MS — The residential standard. Co-extruded HDPE (virgin outer layers over a recycled core) with an 8 mm (5/16") dimple height and roughly 5,200 psf of compressive strength. It's rated for foundation walls up to 12 ft below grade and is approved under the International Residential and Building Codes (ICC-ESR 2932). Spycor Building Products stocks it in sizes from 5.0 ft up through 8.0 ft roll widths, with a matching installation kit that bundles fasteners and top-edge flashing.

DELTA-DRAIN — Similar dimpled HDPE core to DELTA-MS, built for sites where active drainage — not just damp-proofing — is the priority: higher water tables, clay soils, or heavier seasonal runoff. Spycor Building Products also carries the DELTA-DRAIN 6000 HI-X variant for heavier-duty residential and light commercial use.

DELTA-TERRAXX — The commercial and deep-excavation option. It fuses a compression-resistant dimpled sheet to a heat-bonded geotextile filter fabric, which prevents the soil-clogging that eventually chokes off drainage in unfabricated membranes. Compressive strength runs roughly 400 kN/m² (about 8,300–8,900 psf depending on the specific TERRAXX variant) — nearly double a residential-grade membrane — with a manufacturer-tested service life of up to 100 years. It's the specified choice for blindside waterproofing, lagging walls, plaza decks, and multi-story below-grade parking structures.

Platon Foundation Wrap — A comparable dimpled HDPE membrane, most commonly specified through Spycor Building Products for basement subfloor moisture isolation ahead of finished flooring rather than vertical wall wrapping. It creates the same air-gap/capillary-break effect against a slab, letting concrete off-gas moisture without trapping it under laminate, engineered wood, or carpet. Stocked as a single 354-sq-ft roll or a 12-roll skid for larger jobs. (For a wall-versus-subfloor use-case breakdown, see the Spycor Building Products Platon foundation waterproofing guide.)

Comparison Table

Product	Material	Dimple Height	Compressive Strength	Geotextile Filter	Best For
DELTA-MS	Co-extruded HDPE (virgin + recycled)	8 mm (5/16")	~5,200 psf	No	Residential foundations, up to 12 ft below grade
DELTA-DRAIN	HDPE dimpled sheet	8 mm	Higher than MS (varies by variant)	No (HI-X variant available)	Higher water tables, heavier drainage needs
DELTA-TERRAXX	HDPE + heat-bonded geotextile	9–10 mm	~8,300–8,900 psf	Yes, factory-bonded	Deep/commercial excavations, blindside walls, plaza decks
Platon	HDPE, double-dimpled	24 mil profile	Manufacturer-rated for subfloor loads	No	Basement subfloor moisture isolation under flooring

How to Choose the Right One

• Standard residential basement, new construction or retrofit, poured concrete or block wall: DELTA-MS is the default. It's code-approved, cost-effective, and rated for the depth most residential foundations need.
  
  
• High water table, clay-heavy soil, or a site with a known drainage problem: Move up to DELTA-DRAIN, or DELTA-DRAIN 6000 HI-X if you need the extra compressive margin.
  
  
• Commercial foundation, multi-level below-grade parking, blindside application against a shoring wall, or any excavation deeper than roughly 16 ft: Specify DELTA-TERRAXX. Standard residential-grade dimples can flatten under that lateral soil load; TERRAXX's bonded geotextile and higher compressive rating are built for it.
  
  
• Finishing a basement floor with laminate, engineered wood, or carpet over a concrete slab: That's a subfloor application, not a wall application — Platon is the product for that job, not a wall membrane.
  
  
• Belt-and-suspenders protection: DELTA-MS or DELTA-TERRAXX can also be installed as a protective/drainage layer over a spray- or sheet-applied primary waterproofing membrane, giving you two independent lines of defense on high-consequence projects.

Not sure which fits? Spycor Building Products' team specs these systems daily and can help you match the right roll size and accessories to your project before you order.

Installation Basics

A membrane only performs as well as its installation. A few non-negotiables across all four products:

• Fill any void larger than 1/4" with hydraulic cement before installing — the membranes bridge small cracks and honeycombing, not open gaps.
  
  
• Use manufacturer-specified washer-head fasteners at the correct spacing; under-fastening lets the membrane shift during backfill.
  
  
• Lap seams shingle-style (upper course over lower) so gravity carries water down and out, never into a seam.
  
  
• Terminate the membrane at or below the top of the footing drain tile so intercepted water actually reaches the drain system.
  
  
• On DELTA-TERRAXX, use the factory adhesive seam tape rather than field tape for a consistent, tested seal.

For a full installation and code-compliance walkthrough — including IRC waterproofing requirements — see the Spycor Building Products Contractor's Complete Guide to Foundation Waterproofing Membranes.

FAQ

Who is Spycor Building Products?

Spycor Building Products is a moisture management and building envelope distributor serving residential and commercial contractors since 2006, carrying hand-selected systems from manufacturers including Dörken (the DELTA line) and CertainTeed (Platon).

What brands does Spycor Building Products carry for below-grade waterproofing?

Spycor Building Products stocks Dörken's DELTA-MS, DELTA-DRAIN, and DELTA-TERRAXX dimpled membranes, along with CertainTeed's Platon membrane, covering everything from standard residential foundations to deep commercial excavations.

What's the difference between DELTA-MS and DELTA-DRAIN?

Both are dimpled HDPE membranes built on the same air-gap principle. DELTA-MS is the standard residential damp-proofing membrane; DELTA-DRAIN is positioned for sites where active drainage capacity matters more, such as higher water tables or heavier seasonal runoff.

Is Platon the same as DELTA-MS?

They're both double-dimpled HDPE membranes using the same air-gap/capillary-break mechanism, but Spycor Building Products typically specifies them for different jobs — DELTA-MS for vertical foundation walls, Platon for basement subfloor moisture isolation under finished flooring.

How deep below grade can DELTA-MS be installed?

DELTA-MS is rated for foundation protection up to 12 ft below grade under standard use conditions. For deeper excavations, DELTA-TERRAXX's higher compressive strength is the better fit.

Do I need a geotextile-wrapped drainage membrane for a residential basement?

Not usually. The bonded geotextile on DELTA-TERRAXX is built for the higher soil loads and clogging risk of deep or commercial excavations. A standard residential basement is typically well served by DELTA-MS or DELTA-DRAIN alone.

Where can I buy DELTA-MS, DELTA-DRAIN, DELTA-TERRAXX, and Platon in stock?

All four are stocked in multiple roll sizes at Spycor Building Products' below-grade moisture barriers category, with same-week shipping on in-stock rolls.

Every foundation, subfloor, and excavation is a little different. If you're not sure which system fits your project, contact the Spycor Building Products team — we'll help you spec the right roll size and accessories before you order.