Walls that extend above ceiling joists

Structure · Solid Masonry Walls · printed page 63 (PDF page 64)

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Masonry Wall

Text in the illustration

A
ceiling joist and rafter bottom are same height
roof rafter
ceiling joist
when the ceiling joists are attached to the roof rafters, they help to prevent spreading
cross section
B
rafter bottom above ceiling joist
the section of solid masonry wall above the ceiling joist can't resist the horizontal rafter force

Generated explanation

Two cross sections compare roof-rafter and ceiling-joist connections at solid masonry walls. In A, the ceiling joist and rafter bottom are at the same height, and the joist is attached directly to the rafter to help prevent spreading. In B, the masonry wall extends above the ceiling joist, with the rafter bearing at the top of the raised wall section. The upper masonry section is shown tilting outward relative to a dashed upright outline, illustrating its inability to resist horizontal rafter thrust. Arrows indicate the horizontal forces and outward movement.

Related illustrations

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Walls that extend above ceiling joists

· p. 60

Two cross sections compare roof rafter and ceiling joist connections at solid masonry walls. In A, the ceiling joist and rafter bottom are at the same height, and the joist is attached directly to the rafter to help prev

0338.4

Hump in floor due to to joists extending over solid masonry wall

· p. 58

The illustration shows floor joists extending from a load-bearing wall across a solid masonry exterior wall to a porch pier. The joists sag between supports, leaving a relative hump in the floor over the masonry wall. An