Graphical Construction Glossary >> masonry. >> brickwork >> Cavity Wall
These walls because of the cavity are always built in stretcher bond. The architect or designer will usually specify the number and placing of the cavity ties which are essential if the wall has to have any strength at all. The ties come in a variety of patterns and materials. The pressed metal and wire types always have a kink in them at the middle which must always point down to allow any moisture to drip off. The bricklayer lays the ties in the first skin built as the work proceeds and then the second wall when it is being built gets the ties bedded in also. The ties are fixed in a staggered pattern.
The DPC can also be a variety of materials. It is usually placed a couple of courses higher than outside ground level. The inside part of the DPC sits one course higher than the outside to allow any accumulated moisture to escape through the weep holes.
The weep holes are simple end joints every third brick or so that have no mortar in them.
The cavity is normally 50mm or 2" wide. It must be kept clean and no mortar dags should be allowed to bridge the gap between the brick skins. The normal sequence is for the brickies to get all the walls up to DPC height and the the cavities up to that level are filled with concrete.
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