Carpenter Red Seal Exam Prep · Question
A carpenter is installing a header for a 2.1-metre wide window opening in an exterior load-bearing wall supporting only a roof. If using two 38x184 mm (2x8) Spruce-Pine-Fir (SPF) members with a 12.5 mm plywood spacer, approximately what is the maximum permissible length (span) that these headers can accommodate under standard Canadian residential roof loads?
For two 38x184 mm SPF members (a built-up 2x8 header), supporting only roof loads, they can typically span up to approximately 2.7 metres according to prescript
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Question: A carpenter is installing a header for a 2.1-metre wide window opening in an exterior load-bearing wall supporting only a roof. If using two 38x184 mm (2x8) Spruce-Pine-Fir (SPF) members with a 12.5 mm plywood spacer, approximately what is the maximum permissible length (span) that these headers can accommodate under standard Canadian residential roof loads?
Answer options:
- 2.4 metres ✅ 2.7 metres
- 3.0 metres
- 3.3 metres
Correct answer: 2.7 metres
Explanation: For two 38x184 mm SPF members (a built-up 2x8 header), supporting only roof loads, they can typically span up to approximately 2.7 metres according to prescriptive header tables found in the NBC appendices, before professional engineering is required.
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