Durable Below Grade GPS Insulation - Halo Subterra Plus

Halo Subterra Plus

Below-Grade GPS Insulation with Tough Cross Woven Laminate

Halo Subterra Plus combines a high-performance graphite polystyrene (GPS) core with a tough woven polypropylene facing for demanding below-grade applications.

Halo Subterra Plus

Halo Subterra Plus is a rigid below-grade insulation board made with a graphite polystyrene (GPS) core and a durable woven facing. It is designed for under-slab and foundation wall applications where continuous insulation, moisture resistance, and jobsite durability are important. Its facing helps provide vapor control and added protection in wet, demanding below-grade conditions.

Halo Subterra Plus Applications

R-Value
R-5, R-7.5, R-10
Board Thickness
1-1/16″, 1-5/8″, 2-1/8″
Compressive Strength
16, 30 psi (110, 210 kPa)

Halo Subterra Plus Technical Data

Halo Subterra Plus is available in the standard 4′ x 8′ (1230mm x 2460mm) sizing. Custom compressive strength is available.

Tough Woven Laminate for Demanding Below-Grade Applications

Halo Subterra Plus - Durable Flexible Below Grade Insulation
Halo Subterra Plus features a tough cross-woven laminate that adds durability, flexibility, and added protection in demanding below-grade applications. Designed to hold up in rough jobsite conditions it helps protect the board while supporting long-term thermal performance.

Planning a project with Halo Subterra Plus?

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

Explore the Full Halo Product Line...

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!