What is an expansion joint in brickwork and blockwork? An expansion joint in brickwork and blockwork is a means of solving potential problems caused by movement. This movement could be a result of thermal expansion, moisture movement, creep and structural loading or the effect of chemical changes.
What joint type allows for movement in a brick masonry facade?
An expansion joint separates brick masonry into segments to prevent cracking caused by changes in temperature, moisture expansion, elastic deformation, settlement and creep. Expansion joints may be horizontal or vertical.
What is a vertical movement joint?
A vertical movement joint should be located at no greater than half the maximum spacing from a corner or return in a wall. Hence for joint spacing of 12m in a straight run of walling, a joint is required to be no more than 6m from the corner.
What is a movement joint in a wall?
A movement joint, also known as an expansion joint, is a dynamic component that is designed to relieve or absorb movement between structural elements and help prevent cracking.
How does a movement joint work?
An expansion joint or movement joint is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials, and vibration, or to allow movement due to ground settlement or seismic activity.
What is the difference between expansion joint and movement 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.
What types of movement joints are required in a concrete or brick masonry wall?
Movement joints are used to allow dimensional changes in masonry and to minimize random wall cracks and other distress. There are various types of movement joints in buildings: expansion joints, control joints, building expansion joints and construction joints.
What are 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).
What is a perp in bricklaying?
The term ‘perpend’ refers to the vertical joints between blocks or bricks that have been laid in a horizontal course to form a wall. Perpends are normally filled and sealed with mortar. The horizontal mortar joint in a wall construction is typically referred to as the bed joint.
What is the difference between movement joint and expansion joint?
How do movement joints work?
Movement joints – typically a movement joint, also known as an expansion joint because its key function is to allow the building components on either side to expand, while the joint effectively shrinks, is a gap in a structure or structural element designed to separate its constituent parts and to accommodate movement …
What are the different joint movements?
Types of joint movement
- Flexion – bending a joint.
- Extension – straightening a joint.
- Abduction – movement away from the midline of the body.
- Adduction – movement towards the midline of the body.
What is a control joint in brickwork?
The control joint is created by providing a horizontal shelf angle with sufficient space between the underside of the angle and the top of the brickwork below the angle to accommodate all the building and brick movements. The joint is made watertight with a backer rod and a commercial sealant.
What is a horizontal movement joint?
Horizontal Movement Joints The support will be positioned directly over the horizontal movement joint. The joint will often incorporate a compressible filler and should be of sufficient size to allow for expansion of the masonry below and any shrinkage or deflection of the structural frame.
Where should vertical masonry movement joints be located?
Vertical masonry movement joints should be located on both sides of outside wall corners so the distance between them does not exceed the appropriate spacing between movement joints for that specific project.
What is an expansion joint in brick?
Expansion joints are movement joints than pass through materials that have properties of expansion – such as clay brick. With expansive clay bricks on both sides of an expansion joint, these joints should be installed ½-inch wide to let them reduce down to 3/8-inch to match typical mortar joints width.
