0345 Walls that Extend Above Ceiling Joists - Wall Systems - Solid Masonry Walls -

Image Text: Cross section > 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 > B: rafter bottom above ceiling joist > roof rafter > the section of solid masonry wall above the ceiling joist cannot resist the horizontal rafter force > ceiling joist