Foundation Waterproofing & Drainage Systems
Below-Grade Drainage Board
Dimpled high-density polyethylene drainage board designed to help keep foundations, basements, and flooring systems dry by creating a waterproof vapor barrier and drainage air space.
Durable HDPE Construction • Waterproof Vapor Barrier • Moisture Control • All-Weather Installation • Foundation & Basement Protection
Product Overview
Below-Grade Moisture Protection
Drainage Board is a dimpled high-density polyethylene membrane that creates a protective waterproof vapor barrier and continuous air space between the foundation wall and surrounding materials. The dimpled design allows concrete to breathe while directing and controlling moisture around below-grade walls and flooring assemblies.
System Highlights
Material
HDPE
High-density polyethylene
Membrane Type
Dimpled
Creates a drainage air space
Primary Use
Below Grade
Foundations and flooring
Crack Bridging
Up to ¼ in.
Bridges compatible foundation cracks
Key Benefits
Strong HDPE Construction
Manufactured from durable high-density polyethylene for long-term below-grade performance.
Basement Leak Protection
Helps manage moisture and address water-infiltration problems around basement foundation walls.
Waterproof Vapor Barrier
Creates a continuous protective layer that helps control moisture and vapor movement.
Drainage Air Space
The dimpled profile creates an air gap that allows concrete to breathe while directing moisture downward.
Economical Protection
Provides a practical and cost-effective solution for below-grade drainage and moisture management.
All-Weather Installation
Designed for installation in a wide range of weather and job-site conditions.
No Additional Protection Required
Durable membrane construction helps protect the foundation without a separate protection board.
Crack Bridging
Can bridge compatible foundation cracks measuring up to approximately ¼ inch.
Recommended Applications
Foundation Walls
Installed on below-grade exterior foundation walls to manage water and moisture.
Basement Waterproofing
Helps protect basement walls and interior spaces from moisture infiltration.
Below-Grade Floors
Suitable for compatible flooring assemblies requiring moisture and vapor management.
New Construction & Renovation
Suitable for new foundation construction and compatible basement repair projects.
Installation Accessories
Fastening Accessories
Metal Fasteners — Bulk
325 Units
Metal Fasteners — Bag
65 Units
Washers
65 per Bag
Washer Packaging
20 Bags per Box
Finishing Accessories
Molding
10 Units
Plugs
250 per Bag
Plug Packaging
8 Bags per Box
System Type
Complete Drainage Assembly
Product Resource
Product Sheet
Download the Below-Grade Drainage Board Product Sheet
Installation Tip: Use the recommended metal fasteners, washers, plugs, and molding to secure the membrane and properly finish the upper edge of the drainage system.
Important: Confirm foundation preparation, membrane orientation, fastening layout, seams, terminations, drainage conditions, and local waterproofing requirements before installation.