Where do control joints go in masonry walls?
In vertically reinforced masonry walls with masonry lintels, vertical control joints should be located between openings, or at least 24-inches away from the opening – not to exceed 25-feet on-center (Figure 1).
Are control joints required in masonry walls?
Control joints are typically required in exposed above grade concrete masonry walls, where net aesthetic shrinkage cracking may detract from the appearance of the wall, and to limit moisture or air infiltration. Shrinkage cracks in concrete masonry are not a structural concern.
What are concrete masonry control joints?
Control joints in masonry are vertical weak planes intentionally built or cut into masonry to control where cracking occurs. Control joints should be installed in any masonry assembly that expected to experience net shrinkage over time. Usually, we think of control joints in concrete masonry (CMU).
How often do you need control joints in masonry?
The National Concrete Masonry Association (NCMA TEK 10-2C) recommends that control joints be spaced at 25 feet or 1.5 times the height of the wall, whichever is less.
Does thin brick need control joints?
To accommodate this movement, a system of movement joints should be installed through the entire layer of adhered thin brick veneer. If movement joints are not placed properly or are not used at all, cracking may occur. For other thin brick installation methods, incorporate movement joints at regular spacings.
What is the maximum distance of control joints from corners in masonry walls?
Typical joint spacing should be 24 – 26 feet maximum for continuous walls. 2. 16 – 20 ft spacing with lots of openings 3. No more than 12 feet from outside corners on each side 4.
How often do you need a movement joint in brickwork?
In order to avoid the detrimental effects of differential vertical movement between the inner and outer leaves of a wall a horizontal movement joint should be provided at no more than every third storey or 9m, whichever is the less.
Why are expansion joints required in brick walls?
3. Use expansion joints in your brickwork. Expansion joints separate brick masonry into seg- ments to prevent cracking caused by temperature change, moisture expansion, elastic deformation, settlement, or creep. They can be horizontal or vertical.
What is a soft joint in masonry?
A soft joint, or control joint, is simply one grout line, all the way down the length of your installation, that is filled with colored silicone or caulk rather than grout. The purpose of a soft joint is to allow movement in your installation without cracking tiles or grout.
What types of movement joints are required in a concrete masonry wall in a brick masonry wall where should these joints be located?
What type of movement joints are required in a brick masonry wall and where are they installed? Expansion joints are required to control expansion of brick wall by temperature changes in both vertical and horizontal directions. Installed at wall offsets, changes in wall height, and below shelf angles.
What is the difference between control joint and construction joint?
Both isolation and construction joints are formed before the concrete is poured; contraction joints (or control joints) are “placed” in the fresh concrete before it has a chance to create its own joints—also known as cracks.
What is the difference between control joint and expansion joint?
In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement. By contrast, an expansion joint (or movement joint) is sized and formed at a width prescribed by the building design team and sealed and bridged later by an expansion joint system.