when a bricklayer lays DPC (damp proof course membrane) on a house extension, it has to be at least 6 inches from the ground, so rain cannot splash and hit the bricks that are higher than the damp. If the ground level makes it not possible to have the DPC at 6 inch, it can be raised higher than on the house… The only problem with that is you usually put your air grates level with the existing ones on the house, and lay the damp over the top.
To get over this, we put it in telescopic air grates. You can then put the air grates level with the house and project the air upwards and under the joists, meaning water at ground level can go through the air grates and cause no issue, but the air can still get in up and under the joists.
Next is to set out the brick work ready to start building corners on the house extension. The method which all bricklayers use is to measure out from the house in measurements of 900mm a time. This number corresponds to 4 bricks at 215mm and 4 mortar joints at 10 mm thus equalling a total of 900.
Once the bricks have been measured out and they all fit correctly it’s time for some corners to be built. When you build a corner, it is imperative that it’s plumb and gauge. After that, it’s a matter of putting the line on and running the bricks in to lay the course.
Our current extension we are on has a total of 6000 bricks and 1000 blocks in it, and we have just reached the top now and are about to begin the cut up (that’s the triangle part of the brick work most houses have, it’s a trickier part of the job to do because it’s all angles and involves a bit of geometry).
Simon says he wishes he’d paid more attention in maths class sometimes!
Its more difficult also because the bricks, blocks, the mortar and the tools all have to be carried up a massive ladder to reach the top. Sometimes the building trade is not a job for those afraid of heights…