Carpentry 2: Ceiling Framing
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What is the main purpose of ceiling joists?
Tie exterior walls together
How should ceiling joists be fastened to the wall plates?
Must be toe nailed to the wall plate with two 82 mm (3/4") long nails.
Identify 3 ways in which ceiling joists can meet on top of an interior bearing wall.
- a) butted and cleated together
- b) lapped
- c) lapped with blocking between them that is the same thickness as the rafters
How is joist layout affected when joists are lapped over an interior wall?
Layout on one exterior wall will be offset by the thickness of the ceiling joists.
What must be done to the outside ends of ceiling joists?
Joists need to be angled cut that matches the roof slope.
What are sub joists?
- Short ceiling joists that run at 90 degrees to the regular joists.
- Used on buildings with hip roofs, where the regular joists would interfere with the rafters.
According to the National Building Code, what is the minimum size of an attic access require for a single-family home?
0.32 square metres with no dimension less than 545 mm (21.5")
What must be done to the joists if an opening in the ceiling is wider than two joist spacings?
Must be doubled.
Where would a flush beam be required?
In an area in which no interior bearing wall is available to support the ceiling joists and the width of the building exceeds the maximum allowable span of the joists.
What is a strongback?
- An L-shaped framing member that is fastened to the tops of the ceiling joists.
- It stiffens the joists, reduced deflection and maintains the proper on-centre spacing.
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