What is a movement joint in brickwork?
What is a movement joint in brickwork?
Abstract: Expansion joints are used in brickwork to accommodate movement and to avoid cracking. This Technical Note. describes typical movement joints used in building construction and gives guidance regarding their placement.
What is a recessed mortar joint?
Brickwork mortar joint that is raked out to a consistent depth, between 5–10 mm below the surface of the brickwork. The joint tends to hold water that falls on the surface of the wall.
What do you call the joints between bricks?
In masonry, mortar joints are the spaces between bricks, concrete blocks, or glass blocks, that are filled with mortar or grout.
Why we do not want continuous vertical joint in brick masonry?
The rule is, “Vertical joints of the successive courses of bricks should not coincide, that is, a continuous vertical joint across the wall should be avoided since it will gradually result into cracks development.” The strength and stability of the wall is less as compared to the properly bonded brickwork.
How often should you have 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.
Is recessed pointing good?
Recessed Pointing During placing of mortar the face of the pointing is kept vertical, by a suitable tool. This type gives very good appearance.
What is recessed pointing?
Recessed pointing, sometimes referred to as raked joints, is when the mortar joint is raked back a certain depth from the face of the brick. The mortar is first made flush with the brick and then raked out to the desired depth.
What is a concave joint?
A recessed masonry joint, formed in mortar by the use of a curved steel jointing tool; because of its curved shape it is very effective in resisting rain penetration; used in areas subjected to heavy rains and high winds.
What is a movement joint in a 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.
Do movement joints go below DPC?
1 Where the dpc is less than 600 mm above ground level, movement joints for expansion do not generally need to extend below the dpc. 2 Where the dpc is more than 600 mm above ground level, consideration should be given to continuing the expansion joint through the masonry below the dpc.
What is the relationship between brickwork movement joints spacing and thickness?
This may continue for a number of years, but at a reduced rate. The spacing and thickness of movement joints is related to the detailed design, length and height of the brickwork, together with any requirements for structural restraint.
What is recessed joint in construction?
Recessed joint. This is an extra raked joint. The mortar is applied 2 to 5 mm deeper than the visible surface of the facade. The emphasis is laid on the horizontal aspect of the facade, especially in combination with full vertical head joints or even no vertical head joints at all.
What kind of joint is used for brickwork?
Grapevine joints were very popular during America’s colonial period and are now most often used when dealing with antiques or retro-styled brickwork. Raked Joint. Raked joints are similar to flush joints, but rather than aligning perfectly with the brick, they sit back about 2mm.
When to include movement joints in brickwork?
If a return in the length of brickwork is less than 675mm, movement joints should be included to avoid the risk of cracking. This can be achieved by the introduction of a vertical, compressible joint or a “slide-by” detail (see below). Fig. 5 Mechanical couple in short return of clay masonry 675mm