Amdrain: Foundation Insulation

Supplementary component in all types of foundation wall systems where there is a need for insulation with integrated drainage.

Easy Tongue & Groove Installation

Durability and Lightweight

High Vapor Permeance

Long term thermal resistance

Cost Effective

About Amdrain Foundation Insulation

Amdrain is a two-in-one rigid Expanded Polystyrene (EPS) insulation board with integrated drainage channels. The panel is designed to be used in both exterior and interior applications for below grade foundation walls. The inner side (in contact with foundation wall) has vertical grooves (9/16”/14.2mm deep) creating small air gaps and allowing for moisture drainage while the opposite side is flat.

Amdrain EPS panel comes in 4’x8’ (1.22m x 2.44m) sheets with the thickness ranging from 1.5” (38mm) to 5” (127mm). The panels are designed to be installed in the vertical orientation only. The tongue and groove interlock helps maintain the continuity of the insulation eliminating the need for taping of the joints.

Product Features

Amdrain Data Sheet

Thermal Resistance
4 hr.ft2.F/Btu/1 inch (0.70 m2K/W per 25mm)
Vapor Permeance
3.2 US perms (183 ng/Pa.s.m2)
Compressive Strength
22 psi (151 kPa)


Exterior below-grade applications

Interior below-grade applications

Download Brochure & Specs

Building with Amdrain

Superior Thermal Insulator

Amdrain has exceptional long-term R-value retention as well as increased thermal resistance in lower temperatures.

No Risk of Trapped Moisture

Made from EPS with high permeance to allow the passage of water vapor.

Easy to Install

Amdrain foundation insulation is installed with no special tools, equipment or skills.


Has excellent resistance to mold, mildew and maintains its performance over time.

Moisture Management

When installed on the interior, the vertical grooves provide a drainage plane separating potential condensation from the wood framing.

Additional Protection for Waterproofing and Damp Proofing Systems

Provides additional protection during backfill to the waterproofing and/or damp roofing system installed on the foundation wall.

Improved Drainage

When installed on the exterior, the vertical grooves provide an additional drainage plane relieving any hydrostatic pressure, allowing moisture to be redirected down to foundation drain.

The Alleguard Advantage

With a combined 60-year history and proven track record of supporting our customers’ visions, Alleguard is strategically built from the ground up to expand and shape your business. Whether you’re in construction, protective packaging, cold-chain or other industries, we are relentless in going the extra mile to help your business succeed.

About EPS

EPS has high R-value retention, is fully recyclable, and is easily customizable. EPS is made without ozone-harming compounds or any kind of dye. It is available in a variety of compressive strengths and has superior bonding capabilities. Best of all, EPS will save you time and money. So the real question is: Why not EPS?

Shaping A More Sustainable World

Sustainability is one of our top priorities, both for our products themselves and for what our products make possible. Manufactured without ozone-damaging compounds, recyclable and endlessly reusable, EPS has a smaller carbon footprint and results in less pollution than the manufacturing of alternative materials. And EPS helps create a more sustainable world by making buildings more energy efficient, reducing greenhouse gas emissions, preventing product damage and waste, and reducing shipping fuel usage, just to name a few. We’re constantly working to find new ways to be good stewards of our customers’ visions and of our environment.


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