A new condominium complex in Saskatoon uses steel studs for framing exterior walls. What specific challenge does this material choice present regarding thermal performance compared to traditional wood-frame construction, and how is it typically addressed?

Question: A new condominium complex in Saskatoon uses steel studs for framing exterior walls. What specific challenge does this material choice present regarding thermal performance compared to traditional wood-frame construction, and how is it typically addressed?

Answer options:

• Steel studs are too lightweight, requiring thicker insulation; addressed by using higher-density batts. ✅ Steel studs have a much higher thermal conductivity than wood, leading to significant thermal bridging; addressed by using continuous insulation on the exterior.
• Steel studs are prone to rust, requiring a vapour barrier on the exterior; addressed by using a breathable membrane.
• Steel studs are difficult to insulate with traditional batts; addressed by only using spray foam.

Correct answer: Steel studs have a much higher thermal conductivity than wood, leading to significant thermal bridging; addressed by using continuous insulation on the exterior.

Explanation: Steel studs have significantly higher thermal conductivity than wood studs (approx. 300-400 times greater), making them severe thermal bridges. This issue is typically addressed by incorporating continuous insulation (ci) on the exterior of the stud-framed wall assembly, which breaks the thermal bridge and improves the overall effective RSI of the wall.