TBF High Density Thermal Break is a rigid, high-R thermal break material for low-load structural connections, cold storage and foundation isolation. Where STB-1 is built for strength, TBF is built for maximum thermal resistance, with R-values up to 3.1 per inch.
TBF is available in three grades, TBF-150, TBF-200 and TBF-280, so you can match compressive capacity to the connection without paying for strength you do not need. We cut TBF to size in house and can produce parts in as little as 3 days.
TBF Grades and Properties
| Grade | Density (lb/ft³) | Compressive Stress (psi) | Thermal Conductivity k (BTU·in/hr·ft²·°F) | R-Value per Inch | Operating Temperature (°F) |
|---|---|---|---|---|---|
| TBF-150 | 15.0 | 560 | 0.32 | 3.1 | -328 / +176 |
| TBF-200 | 20.0 | 1,100 | 0.38 | 2.6 | -328 / +176 |
| TBF-280 | 28.0 | 2,150 | 0.53 | 1.9 | -328 / +176 |
Density tested to EN 1602 / ASTM D1622. Fire behaviour: DIN 4102 Class B3. Data are nominal and subject to change; verify data for your application and contact us for the current data sheet.
Where TBF Is Used
- Cold storage and freezer foundation isolation – under slabs, column bases and racking supports to limit heat transfer between the cold space and the ground
- Roof anchors, HVAC supports and heat transfer points – isolating lightly loaded attachments that penetrate the roof membrane or insulation
- Foundation and slab connections – thermal separation between slabs, grade beams and foundation walls
- Isolation blocks – thermally isolating equipment, pipe supports and miscellaneous steel
Choosing a TBF Grade
Start with the sustained bearing pressure on the pad, then pick the lightest grade that carries it with your required safety factor:
- TBF-150 – the highest R-value (3.1 per inch) for the lightest loads
- TBF-200 – a balance of thermal resistance and capacity for typical light structural supports
- TBF-280 – the highest compressive capacity in the TBF range
Important: TBF High Density Thermal Break should not be used in moment connections. For balconies, canopies, cantilevered beams and other moment or high-load connections, specify STB-1 Structural Thermal Break, which carries up to 48,000 psi in compression.
Benefits of TBF
- Cost-effective, high R-value thermal break
- Can contribute toward LEED certification points
- Lightweight and easy to handle on site
- Will not rust or corrode
- Cut to size in house, available in as little as 3 days
Not sure whether your connection needs TBF or STB-1? Read What Is a Structural Thermal Break? or send us the loads and we will recommend a material.
Request a Quote or Data Sheet
Send us your connection drawings, bolt schedule or load requirements and we will quote STB-1, TBF, washers and bushings cut and machined to your specification. Data sheets and design support are available for engineers and architects.
Call 800-580-4195 or use the form below. STB-1 typically ships in 5–7 days; TBF in as little as 3 days.