Masonry Control Joints at Intersection Walls
Masonry Control Joints at Intersection Walls
(OP)
Trying to determine which is correct... our general notes read such that a masonry control joint shall be placed at all masonry wall intersections. However, we also show a typical detail for a T-shaped intersection where T-shaped horizontal joint reinforcement is called for to maintain horizontal joint reinforcement continuity - thus making it impossible to provide a vertical control joint at the location. The same question would also apply to corner conditions.
From my limited number of site visits, I don't recall seeing vertical control joints at these locations. However, it would seem to make sense if they were located there to prevent cracks from temp/shrinkage and movement. We typically specify joints be placed at 20 feet on center, but other than the general note, do no make reference to providing them at corners or intersections.
Any advice or suggestions would be greatly appreciated!
From my limited number of site visits, I don't recall seeing vertical control joints at these locations. However, it would seem to make sense if they were located there to prevent cracks from temp/shrinkage and movement. We typically specify joints be placed at 20 feet on center, but other than the general note, do no make reference to providing them at corners or intersections.
Any advice or suggestions would be greatly appreciated!






RE: Masonry Control Joints at Intersection Walls
Also provide joint and tie where two walls join but are supported by different foundations (for example frost wall foundation and thickened slab). This is to provide for possible differential movement.
RE: Masonry Control Joints at Intersection Walls
T intersections are handled in a variety of ways, and can be somewhat confusing with respect to whether they function as control joints or not. The PCA "Concrete Masonry Handbook" has a section "Intersections" that does a nice job of sorting thru this. You can have a fully bonded or tied intersection with mortar joint, or a 2 way control joint whereby you use sealant in lieu of mortar joint, with no ties or joint reinforcing crossing the joint. You can also have a one way control joint by using sealant, with a 1/4" "Z" strap (say 2" end legs, 24" long). The strap provides lateral support for the (continuous) abutted wall, but has enough flexibility parallel with the abutted wall to allow the abutted wall to move without distressing the intersecting wall.
RE: Masonry Control Joints at Intersection Walls