Expansion joints should also be located below shelf angles to account for vertical expansion of brick.
Brick wall expansion joint spacing.
For unrestrained masonry such as parapets and free standing walls vertical joint spacing should be reduced to 5 6m centres.
Thus for a 10 foot high wall control joints should be.
The rst movement joint approximately half the stated joint spacing from the corner see diagram 3.
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 that reason mortar should never.
Assuming a 0 0009 expansion factor the spacing of vertical control joints will depend on the joint capacity to expand or contract.
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.
Vertical expansion joints in brick veneer.
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.
So if you have 12 metres between joints then the joint should be 16mm 12m 4 30 16mm.
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.
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.
When spacing between vertical expansion joints in para.
For brickwork without openings space no more than 25 ft 7 6 m o c.
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.
Scj wi x ei 0 09 where scj control joint spacing m wi width of expansion joint m and ei.
Table 1 empirical control joint spacing for concrete masonry walls.
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.
For copings and cappings which may be prone to greater movement further provision of joints should be considered.
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.
Expansion joints will get smaller as clay products expand closing the gap.
