Page 144 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

There are several different types, as described below:

● Collapsing cavity fixings: these are probably the strongest plasterboard
fixing. They can be used to hang sanitary ware, radiators and many other
types of appliance.
First, a hole is made large enough to pass the fixing through. Then, the fixing
is tightened, collapsing the fixing on to the plasterboard.
● Self-drill plasterboard fixings: these are used to hang small appliances and
p Figure 2.55 Collapsing cavity radiators. The body of the fixing is self-drilling and is simply screwed into the
fixing
wall using a screwdriver. The hanging screw is then screwed into the fixing
body.
● Rubber nut fixings: because of their lack of strength, rubber nut fixings can
p Figure 2.56 Self-drill be used only as lightweight fixings. As the fixing is tightened, the rubber
plasterboard fixing compresses onto the plasterboard.
● Spring loaded toggle bolts: also known as butterfly bolts, the spring toggle
is an excellent plasterboard fixing that can be used to hang radiators and
other small appliances.
First, a hole large enough to pass the toggle through is made in the wall.
Then, as the bolt is pushed through the hole, the spring opens the toggle,
allowing it to be drawn up against the wall and creating the fixing.

Plastic wall plugs
Plastic wall plugs are used in conjunction with screws to fasten appliances,
sanitary ware and many other pieces of equipment to masonry, concrete and
stone walls. They are available in different sizes to match screw gauge and are
colour coded for easy identification. The wall must be drilled with a masonry
drill bit of a specific size for the colour of the plug (see Table 2.38).

 Table 2.38 Rawlplug size to hole diameter
Colour Screw gauge/size Plug length mm Hole diameter mm
Yellow No. 4–10 25 5
Red No. 6–12 35 6
Brown No. 10–14 45 7
Orange No. 8–12 25 6.5
Grey No. 8–10 35 5.5
White No. 8–12 35 6.5
Blue No. 10–14 35 8

Installing rawlplugs (to hang a radiator bracket), step by step

1 Mark and drill the hole using the correct size drill to the correct depth for the
plug.
2 Insert the plug into the hole and push it slightly below the walls surface.
3 Using the correct size screw, fasten the radiator bracket to the wall using a
screwdriver.

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