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Carpenter Red Seal Exam Prep · Question

When framing an opening for an exterior door, what is the recommended practice for applying building paper (sheathing membrane) around the rough opening before installing the door frame?

To create an effective weather seal, building paper should be cut and folded into the rough opening. This technique, often referred to as a modified 'I' or 'H'

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Question: When framing an opening for an exterior door, what is the recommended practice for applying building paper (sheathing membrane) around the rough opening before installing the door frame?

Answer options:

  • Install the building paper after the door frame is completely installed and shimmed.
  • Cut the building paper flush with the rough opening studs and header. ✅ Cut the building paper in a modified 'I' or 'H' shape, bringing the flaps into the opening and fastening them to the jambs and headers.
  • Fold the building paper back onto itself and tape it to the exterior sheathing around the opening.

Correct answer: Cut the building paper in a modified 'I' or 'H' shape, bringing the flaps into the opening and fastening them to the jambs and headers.

Explanation: To create an effective weather seal, building paper should be cut and folded into the rough opening. This technique, often referred to as a modified 'I' or 'H' cut, creates integrated flashing that directs water away from the opening.

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