SilveRboard® Graphite

Graphite polystyrene (GPS) rigid board insulation with double-sided reflective film that improves thermal comfort and energy efficiency.

Easy Installation

Durability and Lightweight

Higher R-value per dollar

Increased Thermal Performance

Cost Effective

Expanded Polystyrene Embedded with Graphite Particles

SilveRboard® Graphite XS can be used as the second plane of protection under exterior cladding when the joints are properly taped and sealed, eliminating the need for an additional membrane. The laminated film comes micro perforated by default (denoted by XS) but is also available without perforations by special order.


Both SilveRboard® 35XS and SilveRboard® Graphite XS are available in a wide range of thicknesses ranging from 1/2″ (13mm) to 6″ (152mm). Standard board dimensions include 4×8′ and 4×9′ (1.2×2.4m and 1.2×2.7m).

R4.43 (RSI 0.78)
Vapor Permeance
Perforated 2.74 US perms (157 ng/Pa.s.m2) Non-perforated 0.77 US perms (44 ng/Pa.s.m²)


Exterior above grade wall

Attic ceiling

Cathedral ceiling

Interior foundation wall


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Why Build with SilveRboard® Graphite

Contractor & Installer

Lightweight, flexible continuous insulation that provides a higher R-value per dollar and easy installation

Architect & Engineer

Sustainable, innovative graphite continuous insulation that helps achieve building code requirements

Builder & Developer

Achieve building code requirements and construction permits while remaining cost effective


Increase thermal comfort, energy efficiency and achieve a better insulated 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 Graphite Polystyrene Insulation (GPS)

High performing and cost effective non-structural graphite polystyrene (GPS) rigid insulation board for exterior wall applications on wood or steel frame construction. The expanded polystyrene (EPS) core is embedded with graphite particles which increase the thermal performance, compared to conventional EPS.

In addition to the increased thermal resistance, the foam is laminated with a reflective film on both sides increasing board strength and flexibility, reducing site damage and waste. The reflective laminated surfaces are micro perforated giving the panel high water vapor permeance greatly reducing the likelihood of trapped moisture through the increased drying potential. The larger panels and laminated film help improve job site efficiency and reduce labor costs.

Building with SilveRboard® Graphite

Superior Thermal Insulator

SilveRboard® Graphite has a high R-value and an exceptional long-term R-value retention. It also provides increased thermal resistance in lower temperatures.

Permeable Barrier

The perforated boards provide high vapor permeance allowing walls to dry out and can act as a second plane of protection when taped and sealed.

Durable, Lightweight, Flexible

Each panel is easy to handle due to the ultra-low weight and is easily cut.

Improved Indoor Air Quality

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

Environmentally Friendly

Graphite EPS foam saves energy during manufacturing.

Increases Comfort & Energy Savings

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

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