High-Density SilveRboard®: Reflective Insulation

High density insulation to improve thermal comfort for below grade applications.

Easy Installation

Durability and Lightweight

Exterior Grade

Increased Thermal Performance

Cost Effective

SilveRboard® Reflective & Under Slab Insulation

SilveRboard® is a rigid insulation board made from Expanded Polystyrene (EPS) covered with a layer of polypropylene reflective lamination on both sides. This highly effective combination of materials offers high compressive strength and great thermal performance when used in below grade and under slab applications.

The double-sided lamination dramatically increases board strength and flexibility, reducing site damage and waste. The availability of larger panels and laminated film help improve job site efficiency and reduce labor costs.

Product Features

SilveRboard® Data Sheet

R4.1, R4.3, R4.35 and R5
Compressive Strength
12psi (83 kPa), 20psi (138 kPa), 25psi (172 kPa), 35psi (241 kPa), 40psi (276 kPa)
Flexural Strength
40psi (275 kPa), 60psi (414 kPa), 76psi (524 kPa), 84psi (579 kPa), 106psi (730 kPa)


Attic ceiling, cathedral ceiling

Exterior foundation wall

Above/below concrete slab

Frost walls

Radiant floor heating

Snow melt and de-icing

Download Brochure & Specs

Why Build with SilveRboard®?


Lightweight, flexible high density rigid insulation that reduces job site waste and expedites construction schedules

Architect & Engineer

High density, flexible rigid insulation for below grade residential and commercial applications


Improve the thermal performance and comfort of your home

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?

Building with SilveRboard®

Superior Thermal Insulator

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

Built-in Water & Vapor Barriers

When the joints are taped and sealed it can function as a vapor barrier.

Durable, Lightweight, & Flexible

Each panel is easy to handle due to the low weight and can be easily cut.

Improved Indoor Air Quality

SilveRboard does not contain CFCs or HCFCs, no off-gassing and does not promote growth of mold and mildew.

Environmentally Friendly

EPS foam can be recycled and uses only steam and water during manufacturing.

Increases Comfort & Energy Savings

Acts as continuous insulation in the building envelope, reducing thermal bridging and energy consumption while improving home owner comfort.

SilveRboard® Projects & Applications

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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Interested in Learning More?

Whether you need a custom solution for a unique project or have a question, we’re here to help.