- PERMANENT R5 PER 1-1/16 INCH
- IMPROVED THERMAL PERFORMANCE
- LIGHTWEIGHT & DURABLE
Halo® Subterra® is a rugged foam board insulation designed specifically for below-grade applications. It features a high-performance GPS core, laminated on both sides with a thick polypropylene film, making it highly durable and suitable for various below-grade uses such as perimeter insulation, frost shields, under slabs, and grade beams. Subterra provides excellent long-term thermal performance, waterproofing protection, and energy efficiency. When taped, Subterra acts as a vapor barrier, making this 2-in-1 insulation board cost-effective both in terms of materials and labor.
Features & Benefits
- Below-grade applications
- When taped, qualifies as a vapor barrier
- R-5 per nominal inch*
- Air and moisture barrier
- GPS provides a permanent long-term R-value and won’t deteriorate over time like XPS and ISO
- Minimizes the energy loss from thermal bridging
- Light, durable, easy to cut and install
- GPS is 100% recyclable which contributes to environmental sustainability
- Available thicknesses from 1” – 3 3/16”, 25 PSI
* Thermal performance claim based on a thickness of 1-1/16”
Specifications
| Thickness | R Value |
| 1” | R4.7 |
| 1 1/16” | R5 |
| 1 ½” | R7.05 |
| 1 ⅝” | R7.5 |
| 2” | R9.4 |
| 2 ⅛” | R10 |
| 2 ½” | R11.75 |
| 2 ⅝” | R12.5 |
| 3” | R14.1 |
| 3 3/16” | R15 |
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FAQs
What tape is recommended to seal seams for Halo Subterra to ensure a proper vapor barrier is formed?
To ensure a proper vapor barrier is formed when sealing seams for Halo Subterra should be taped with Perma”R” Contractor Grade Sheathing Tape or a qualified pro-grade sheathing tape.
What is the required PSI for residential below grade applications?
A minimum compressive strength of 16 psi is recommended for most underslab insulation applications.
What adhesive is recommended to use to adhere Subterra to concrete walls?
To adhere Subterra to concrete walls, Perma “R” Products recommends using PL300 Foam Board Adhesive by Loctite. This adhesive is compatible with EPS and provides high bonding strength once cured.