Tn 18A web-nov06. indd



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Offsets and Setbacks. Parallel walls will expand toward 

an offset, rotating the shorter masonry leg, or causing 

cracks within the offset, as shown in 

Figure 4a

. Place 

expansion joints at the offset to allow the parallel walls to 

expand, as 

Figure 4b

 illustrates. Expansion joints placed 

at inside corners are less visible.



Openings. When the spacing between expansion joints 

is too large, cracks may develop at window and door 

openings. In structures containing punched windows and 

door openings, more movement occurs in the brickwork 

above and below the openings than in the brickwork 

between the openings. Less movement occurs along 

the line of openings since there is less masonry. This 

differential movement may cause cracks that emanate 

from the corners of the opening, as in 

Figure 5


. This 

pattern of cracking does not exist in structures with 

continuous ribbon windows.


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