Solid EPS void form

Dynaflex

EPS Void Form for Subgrade Uplift Protection

Dynaflex is a solid EPS void form designed to protect grade beams, pile caps, structural slabs, and other concrete elements from frost heave and expansive soil uplift.

What is Dynaflex?

Dynaflex is a rigid, closed-cell expanded polystyrene (EPS) compressible fill used beneath grade beams, structural slabs, pile caps, and other near-grade concrete elements. As a solid void form, it compresses under soil movement to help protect structural concrete from damage caused by swelling clay soils and freezing subgrade materials.

Dynaflex Applications

DYNAFLEX Void Form
Available Densities
Standard, MD-2, HD-4
Recommended Max Placing Loads
5.08 psi (35 kPa), 8.70 psi (60 kPa), 13.78 psi (95 kPa)
Supported Concrete Thickness
1.5 m, 2.5 m, 4.0 m

Dynaflex Technical Data

Available Sizing: Dynaflex is available in 4″ to 6″ thicknesses, with board sizes from 8″ × 48″ up to 48″ × 96″.
Solid EPS void form

Planning a project with Dynaflex?

Contact Beaver’s sales team for product specifications, application guidance, and project support.

How Does Void Form Work?

Void forms are used to create space beneath structural elements so movement in the underlying soil can occur without transferring damaging pressure into the structure. Beaver offers multiple void form solutions designed for different applications and site conditions:
Frost Cushion
Low-uplift void form for frost and soil swell.
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Dynaflex
Solid compressible EPS void form for grade beams.
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Dynavoid
Controlled-collapse void form for structural slabs on expansive soils.
Learn More

Rebrand Announcement

For 58 years Beaver Plastics has been a trusted provider of Expandable Polystyrene (EPS) Insulation. We are excited to announce that effective September 2025, 

Beaver Plastics Ltd. is now BEAVER Thermal Solutions Inc.

This change reflects our commitment to innovation, thermal performance, and sustainability—while keeping the same trusted team, values, and high-quality products you know us for.

Welcome to www.bvrthermal.com!