NVQ Diploma L2 6705-23

Unit 206 Construct cavity walling forming masonry structures

Aim

The aim of this unit is to provide the learner with the
knowledge and skills to construct walling to form masonry structures

Learning outcome

The learner will:

3.8 Describe methods of establishing face bonds for cavity walls

Dry Bond

When setting out a building is good practice to place a course of bricks to gauge along the length of the wall in Dry Bond which is laying bricks without mortar on the bed and perp joints to the co-ordinating size of 225mm which is the working size of a brick with perp joint.

Generally, architects will design Buildings with the aid of a brick dimension table to minimise cuts during construction

Therefore, there are three different combinations when setting out or measuring bricks and mortar as follows;

CO+ Brick + 2x10mm mortar joints
CO Brick + 1x10mm mortar joint
CO- Brick dimension only.

Time is saved on the wasteful cutting of bricks can be avoided and the overall appearance of the face brickwork appearance will be enhanced.

Window and Door Reveals

During the dry bonding process, you must take all the relevant dimensions from the working drawings for windows, doors or any openings to ensure they conform to the architects coordinate sizes.

The reveals are shown in dark orange bricks in the above diagram you will notice the bond on either side of the reveals is symmetrically on each course of brickwork.

Perps Joints

Perps are vertical joints between each brick which must be plum through the height of the wall, using a pencil mark on the face of the brick every fourth or fifth course will help you to keep to vertical perp joints plumb.

Bond Size

Broken bond solutions for a stretcher bond wall

Bond Size means the length of the wall or pier has no cut bricks in the brick courses, for example, each course has a stretcher at each end or a header.

If you need to insert a broken bond into your brick courses ideally needs to be in the middle of the wall or pier, in some situations this may not be possible bricklayers must use their discretion on placing broken bond so the overall effect is not lost in bond and arrangement.

Here are some Bonding Solutions for Stretcher Bond

The above example of stretcher bond wall works to half a brick length, in this situation you can place stretcher at one end and half-brick at the opposite end which is repeated every alternate course.

Reverse Bond at Window Reveals

Instead of slightly and evenly adjusting the cross joints to avoid broken bond, it may be possible to use reverse bond to avoid any broken bond that occurs.

Reverse bond allows bricks in reveals either side of openings or at the end of walls to be asymmetrical.