Carpenter Red Seal Exam Prep · Question
A client is concerned about ice damming and moisture accumulation in their unvented attic space. The existing soffit vents provide 0.05 m² of net free area, and the ridge vent provides 0.03 m² net free area. The attic floor area is 120 m². Is the current venting adequate based on the 1:300 NBC 2020 ratio?
The required total net free venting area is 120 m² / 300 = 0.40 m². The current total is 0.05 m² (soffit) + 0.03 m² (ridge) = 0.08 m². Therefore, the current ve
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Question: A client is concerned about ice damming and moisture accumulation in their unvented attic space. The existing soffit vents provide 0.05 m² of net free area, and the ridge vent provides 0.03 m² net free area. The attic floor area is 120 m². Is the current venting adequate based on the 1:300 NBC 2020 ratio?
Answer options:
- Yes, the total venting area is sufficient. ✅ No, the total venting area is insufficient.
- The soffit vents are adequate, but the ridge vent is not.
- The ridge vent is adequate, but the soffit vents are not.
Correct answer: No, the total venting area is insufficient.
Explanation: The required total net free venting area is 120 m² / 300 = 0.40 m². The current total is 0.05 m² (soffit) + 0.03 m² (ridge) = 0.08 m². Therefore, the current venting is insufficient as it is far below the required 0.40 m².
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