Carpenter Red Seal Exam Prep · Question
A residential garage door opening is 3.6 metres wide. The wall above is carrying a floor and roof load. If using Spruce-Pine-Fir (SPF) lumber for the header, what is the minimum required header size to adequately support the loads in this scenario, assuming a standard height wall and typical residential loads for a 2-storey house?
For a 3.6m garage door opening supporting floor and roof loads, standard header tables (derived from CSA O86/NBC) typically require a substantial header. Two 38
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Question: A residential garage door opening is 3.6 metres wide. The wall above is carrying a floor and roof load. If using Spruce-Pine-Fir (SPF) lumber for the header, what is the minimum required header size to adequately support the loads in this scenario, assuming a standard height wall and typical residential loads for a 2-storey house?
Answer options:
- Two 38x235 mm members with a 12.5 mm plywood spacer
- Two 38x184 mm members with a 12.5 mm plywood spacer ✅ Two 38x286 mm members with a 12.5 mm plywood spacer
- Three 38x184 mm members without a spacer
Correct answer: Two 38x286 mm members with a 12.5 mm plywood spacer
Explanation: For a 3.6m garage door opening supporting floor and roof loads, standard header tables (derived from CSA O86/NBC) typically require a substantial header. Two 38x286 mm members with a spacer provide the necessary beam depth and stiffness for this span and load condition.
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