Rub-R-Board: The Drainage Board That Protects Waterproofing and Relieves Hydrostatic Pressure

Every contractor knows: waterproofing a foundation is only half the battle. The real test comes when soil, groundwater, and backfill rock push relentlessly against that membrane. Without proper drainage, hydrostatic pressure builds up. Without a protection course, rocks puncture the waterproofing during backfill. Either way, you’re left with a compromised system and an unhappy client.

That’s why the Rub-R-Wall Waterproofing System isn’t complete without Rub-R-Board — a dimpled drainage and protection board engineered to do two critical jobs at once:

1. Protect the membrane from damage during backfill.

2. Channel water away from the foundation to relieve hydrostatic pressure .

It’s the unsung partner that ensures the waterproofing you install today continues working for decades.

How Rub-R-Board Works

Rub-R-Board is built with a light-duty impermeable polymeric sheet, heat-formed into a dimpled core. On top of that sits a bonded nonwoven filter fabric that allows water to pass while blocking soil particles and fine debris .

• Filter Fabric: Keeps soil, sand, and grout out of the drainage system.

• Dimpled Core: Creates continuous drainage channels that move water vertically down to perimeter collection systems.

• Protection Layer: Acts as a buffer between sharp backfill rock and the waterproofing membrane.

By combining these functions, Rub-R-Board doesn’t just drain water — it protects the entire waterproofing investment.

Why Contractors Choose Rub-R-Board

Installing Rub-R-Board is like adding insurance to your waterproofing job. Here’s why it’s a must-have on professional sites:

• Hydrostatic Pressure Relief: With flow rates up to 12.5 g/min/ft (155 L/min/m) under load , Rub-R-Board ensures water doesn’t linger at the foundation.

• Membrane Protection: Resists punctures with a CBR puncture strength of 250 lbs. .

• High Compressive Strength: Handles 5,200 psf (249 kNm²) of soil load without crushing .

• Durability: UV resistant (70% strength retention at 500 hours) and engineered for long-term soil contact .

• Easy Installation: Available in multiple roll widths (4, 6, and 8 ft) to match foundation sizes .

• Lightweight & Manageable: Roll weights as low as 35 lbs. make it easy for crews to handle .

Bottom line: Rub-R-Board keeps the waterproofing membrane intact and functioning as designed.

Technical Strength That Performs in the Ground

For spec-driven contractors and engineers, Rub-R-Board offers tested performance backed by ASTM standards:

• Compressive Strength: 5,200 psf (ASTM D1621)

• Thickness: 0.31 in. (7.87 mm)

• Flow Capacity: 12.5 g/min/ft (ASTM D4716)

• CBR Puncture: 250 lbs. (ASTM D6241)

• Grab Tensile: 100 lbs. (ASTM D4632)

• AOS (Apparent Opening Size): 70 U.S. Sieve / 0.212 mm (ASTM D4751)

• UV Resistance: 70% retention at 500 hrs. (ASTM D4355)

This data proves Rub-R-Board isn’t just another plastic sheet. It’s a performance-driven drainage layer engineered to support commercial- and residential-grade waterproofing systems.

Rub-R-Board vs. No Protection

Contractors who use Rub-R-Board reduce callbacks, warranty claims, and liability — while delivering better long-term value to property owners.

The Bottom Line: Don’t Stop at the Membrane

Waterproofing doesn’t end when the sprayer shuts off. The real durability test comes when tons of backfill are pushed against the wall. Protect your work with Rub-R-Board, the drainage and protection course engineered for the Rub-R-Wall Waterproofing System.

• Shields membranes from punctures.

• Channels water away to relieve pressure.

• Lightweight, durable, and easy to install.

With Rub-R-Board in place, you’re not just waterproofing a foundation — you’re building confidence into every wall.

Protect More Than the Wall — Protect Your Reputation

Don’t let backfill undo your hard work. Add Rub-R-Board to your waterproofing system and ensure every foundation you build stays dry and protected.