For copings and cappings which may be prone to greater movement further provision of joints should be considered.
Brick wall expansion joint spacing.
For brickwork without openings space no more than 25 ft 7 6 m o c.
Expansion joints will get smaller as clay products expand closing the gap.
Thus for a 10 foot high wall control joints should be.
Scj wi x ei 0 09 where scj control joint spacing m wi width of expansion joint m and ei.
For walls containing masonry parapets consider the parapet as part of the masonry wall below when determining the length to height ratio if it is structurally connected by masonry materials.
Expansion joints should also be located below shelf angles to account for vertical expansion of brick.
Expansion joints are placed in clay masonry walls to allow room for the wall to expand.
The amount of expansion depends on firing characteristics of the masonry units but is typically not more than 0 10 inches in 25 ft.
For unrestrained masonry such as parapets and free standing walls vertical joint spacing should be reduced to 5 6m centres.
Table 1 empirical control joint spacing for concrete masonry walls.
Assuming a 0 0009 expansion factor the spacing of vertical control joints will depend on the joint capacity to expand or contract.
In theory an expansion joint could be located at the corner but this would a ect the buttressing o ered by the return wall unless the masonry was suitably tied in accordance with an engineer s design.
As mentioned in the expansion joints discussion the design of control joint spacing and location is the responsibility of the designer.
When accent bands of other materials such as precast or concrete masonry units are included in a wall it may be prudent to include a bond break or slip joint between the two dissimilar materials if their coefficients of expansion are.
With respect to horizontal expansion joints for vertical movement the outer leaf should be supported at.
This can be determined from the properties of the sealant applied in the joint as follows.
For brickwork with multiple openings consider symmetrical placement of expansion joints and reduced spacing of no more than 20 ft 6 1 m o c.
When spacing between vertical expansion joints in para.
Joint positions will also be impacted by the type of brick the change in height of external materials the placement of windows and door openings the location of wall ties and the bed joint reinforcement.
So if you have 12 metres between joints then the joint should be 16mm 12m 4 30 16mm.
Vertical expansion joints in brick veneer.
When no joint reinforcing is used national concrete masonry association ncma tek 53 design of concrete masonry for crack control recommends spacing control joints in straight wall sections without openings no farther apart than twice the height of the wall 40 feet maximum.
