BELOW GRADE INSULATION

Below Grade Insulation

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Insulation Solutions for Waterproofing and Thermal Protection

Welcome to our Below Grade Insulation Solutions page, where we offer comprehensive solutions for waterproofing and thermal protection in below-grade structures.


Our foam insulation products are engineered to provide effective moisture resistance, thermal insulation, and protection against soil gases for various applications in construction. Request a quote today to get started.

Key Features of Our Below Grade Insulation

  • Waterproofing: Prevent water infiltration and moisture damage with our durable and water-resistant below-grade insulation.
  • Thermal Insulation: Maintain consistent indoor temperatures and reduce energy loss in below-grade environments, enhancing comfort and energy efficiency.
  • Soil Gas Protection: Mitigate the risk of soil gas intrusion, including radon, methane, and volatile organic compounds (VOCs), ensuring a safe and healthy indoor environment.

Applications for Below Grade Insulation

  • Foundation Wall: Ensure durable and reliable insulation for foundation walls, protecting against moisture infiltration and thermal bridging.
  • Underslab: Provide effective insulation and moisture protection for underslab applications, maintaining optimal conditions for flooring systems.
  • Cold Storage: Preserve temperature-sensitive materials and maintain cold storage conditions with high-performance below-grade insulation solutions.
  • Plaza Decks: Enhance waterproofing and thermal performance in plaza decks and pedestrian areas, extending the lifespan of structures and minimizing maintenance requirements.

Benefits of Below Grade Insulation

  • Enhanced Durability: Extend the lifespan of below-grade structures by protecting against water damage, moisture intrusion, and soil gases.
  • Energy Savings: Reduce heating and cooling costs for below-grade spaces while improving occupant comfort and energy efficiency.
  • Environmental Protection: Create a healthier indoor environment by minimizing exposure to moisture, mold, and soil contaminants, promoting occupant health and well-being.


Get in touch with us today to learn more about our below-grade insulation solutions and how they can benefit your construction project.


  • ThermalStar Below Grade Insulation Board Brochure (Rev. 01/13/23)

    ThermalStar Rigid Insulation

    Below Grade Insulation Board

    Foundation Wall | Underslab | Cold Storage

    Download Brochure

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Source Mountain Supply, LLC

Located in West Bend, WI, Source Mountain Supply, LLC sells industrial supplies, including foam packaging products. 10% new customer discount. Meeting or beating competitor prices. Quick turnaround times. Fill out our form for a free quote.

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