Minimize Thermal Bridging in Cold-Formed Steel (CFS) Framed Buildings

To mitigate thermal bridging in cold-formed steel (CFS) framed buildings, the focus should be on applying continuous exterior insulation, using thermally broken connections, and adopting advanced framing techniques. These strategies effectively reduce heat transfer through structural components and enhance the building's energy efficiency. Here's a more detailed breakdown: 

1. Continuous Exterior Insulation

Objective: Establish a seamless thermal barrier to limit heat loss through steel framing components.

Recommended Materials: Options such as expanded polystyrene (EPS), extruded polystyrene (XPS), and graphite polystyrene (GPS) are frequently used.

Application: Insulation should be installed on the exterior side of CFS framing without leaving any gaps or voids.

Advantages: Provides a consistent thermal barrier, reduces heat loss, and minimizes the risk of moisture-related issues.

2. Thermally Broken Connections

Objective: Introduce thermal breaks at connection points to disrupt the flow of heat through steel components.

Examples: Thermal strips, shims, or slotted studs can be incorporated as effective solutions.

Advantages: Reduces conductive heat transfer, enhancing the energy efficiency of the building envelope.

3. Advanced Framing Techniques

Objective: Optimize framing designs to decrease the exposure of steel to exterior temperatures.

Examples: Utilizing staggered stud walls or double stud walls can significantly lower conductive heat paths.

Advantages: Streamlines framing, reduces thermal bridging, and improves insulation continuity.

4. Additional Measures

- High-Performance Windows and Doors: Choose products with low U-values and thermal breaks within their frames for improved efficiency.

- Airtightness: Seal all gaps, cracks, and penetrations in the building envelope to minimize air leaks and maintain indoor comfort.

- Ventilation: Implement proper ventilation systems to manage indoor humidity and minimize condensation risks.

- Material Selection: Opt for cladding and other building materials with low thermal conductivity wherever feasible.

Combining these approaches helps create a more energy-efficient and comfortable building while minimizing potential long-term issues related to thermal bridging.