Rain water, soil waste and vent pipes can be embedded in the walls and floors or fixed on them. When they are embedded no fixing devices, are required. But for ease in repairs and maintenance usually they are fixed on the outside of walls.
For fixing them special types of brackets are required. Fig. 24.12 shows one most common type of fixing bracket having aluminium painted clips. These brackets fit closely round the pipe or accessory directly beneath the socket and have ears for securing to the face of the face of the structure. When fixed, they present a neat appearance.
The jointing of pipes and accessories is done as follows. First a gasket or hemp yarn saturated with Bitumastic jointing compound is caulked to about 2.5 cm depth. Then the space between the collar and plain end is ground with stiff mortar of cement. Fig. 24.13 shows the method of jointing A.C. pipe.
After fixing and jointing all pipes and accessories must be tested for water tightness. This is done by dividing the whole work in sections and testing each section one by one.