NBS Source
Armatherm™ Grade FRR Balcony Connection

Application

Suitable for use to maximize insulation values so heat loss can be reduced in wall assemblies.

Description

A combination of low thermal conductivity and high compressive strength that can be used in structural steel framing connections for transferring load in moment and shear conditions without creating significant rotation.

Armatherm™ FRR has been structurally tested for creep, rotation and any impact on bolt force, minimizing heat flow whilst retaining the structural performance of connections.

The product can support up to 275 N/mm² and have a thermal resistance (R-value) of 0.9 m²K/W per inch (25 mm), which can be reduced by as much as 60%. The material is made of a reinforced, thermoset resin which is fire resistant and has very limited creep under load, making it suitable for use in structural steel and façade thermal breaks.

The most common interface details for structural framing are canopies and balconies that use cantilevered steel or aluminium elements. These elements are typically connected to slab edges or spandrel beams on the interior side of the thermal envelope, passing through insulation and air barrier layers. Using a thermal break at these connections will improve the thermal transmittance (U-value) of a wall assembly which includes this type of point transmittance (heat flow) by as much as 70%.


Performance (scenarios):

- Continuous beam:

  • Exterior insulation 1D R-value: R-15 (2.64 m²K/W).
  • Clear wall R-value: R-18.5 (3.25 m²K/W).
  • U-value: 0.054 (0.31 W/m²K).
  • R-value (effective with slab and beam): R-6.9 (1.21 m²K/W).
  • U-value (effective with slab and beam): 0.145 (0.83 W/m²K).
  • Point transmittance of beam: 1.73 (0.92 W/K).

- 25 mm Armatherm FRR using steel bolts:

  • Exterior insulation 1D R-value: R-15 (2.64 m²K/W).
  • Clear wall R-value: R-18.5 (3.25 m²K/W).
  • U-value: 0.054 (0.31 W/m²K).
  • R-value (effective with slab and beam): R-7.3 (1.28 m²K/W).
  • U-value (effective with slab and beam): 0.138 (0.78 W/m²K).
  • Point transmittance of beam: 1.56 (0.83 W/mK).
  • Reduction in heat loss: 10%.

- 25 mm Armatherm FRR using stainless steel bolts:

  • Exterior insulation 1D R-value: R-15 (2.64 m²K/W).
  • Clear wall R-value: R-18.5 (3.25 m²K/W).
  • U-value: 0.054 (0.31 W/m²K).
  • R-value (effective with slab and beam): R-8.4 (1.48 m²K/W).
  • U-value (effective with slab and beam): 0.119 (0.68 W/m²K).
  • Point transmittance of beam: 1.16 (0.62 W/mK).
  • Reduction in heat loss: 33%.

- 25 mm Armatherm FRR using stainless steel bolts and FRR washers and bushings:

  • Exterior insulation 1D R-value: R-15 (2.64 m²K/W).
  • Clear wall R-value: R-18.5 (3.25 m²K/W).
  • U-value: 0.054 (0.31 W/m²K).
  • R-value (effective with slab and beam): R-9.2 (1.61 m²K/W).
  • U-value (effective with slab and beam): 0.109 (0.62 W/m²K).
  • Point transmittance of beam: 0.95 (0.50 W/mK).
  • Reduction in heat loss: 45%.

- 50 mm Armatherm FRR using stainless steel bolts and FRR washers and bushings:

  • Exterior insulation 1D R-value: R-15 (2.64 m²K/W).
  • Clear wall R-value: R-18.5 (3.25 m²K/W).
  • U-value: 0.054 (0.31 W/m²K).
  • R-value (effective with slab and beam): R-10.2 (1.79 m²K/W).
  • U-value (effective with slab and beam): 0.098 (0.56 W/m²K).
  • Point transmittance of beam: 0.72 (0.38 W/mK).
  • Reduction in heat loss: 58%.

General information

Uniclass

Pr_35_90_15_89 Thermal break connection platesPrimary

CAWS

E40/440 Load transfer systems

Specification data - Thermal break connection plates Enhanced data

Dimensions

-

Thickness (maximum)

13 mm.

15 mm.

20 mm.

25 mm.

50 mm.

Operating temperature (maximum)

-51°C to 90°C.

Product Reference

Armatherm™ Grade FRR Balcony Connection

Accessories

 Bushing and washers:


  • With a bolt-through insulation pad, there is the possibility of a slight thermal transfer along the connecting bolt; however, this effect can be reduced with the addition of insulation washers and bushing.
  • In extreme applications (e.g. swimming pools), to prevent condensation on the bolt head, a polyurethane nut cap can be supplied to effectively screen this cold surface from the internal environment.
  • For added thermal breaking, bushes and washers can be used on the warm face of the structure.

None.

Bushings.

Insert size, M12, M16, M20 and M24 available.

Washers.

Insert size, M12, M16, M20 and M24 available.

ShearStrength

110 N/mm².

CompressiveStrength

4640 N/mm².

SurfaceSpreadOfFlame

Class A, 25.

Density

1350 kg/m³.

ThermalConductivity

0.30 W/m·K.

For comparison, the thermal conductivity of carbon steel is 56 W/m·K

Literature

Armatherm Structural Thermal Breaks

Armatherm Structural Thermal Breaks

Armatherm FRR - Structural Thermal Break

Armatherm FRR - Structural Thermal Break

Steel Canopy/Balcony Thermal Break - Armatherm

Steel Canopy/Balcony Thermal Break - Armatherm

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