A Self-Learning Manual - Institution of Engineers Mauritius

A Self-Learning Manual
Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU
normally the following components are:
(i) Above the structural finish level of the concrete roof, a screed of
uniform thickness is applied to provide a smooth surface for the
application of waterproofing membrane. (Screed of varying thickness
can also be designed on the roof to create a slope for drainage.) The
screed used for providing a surface for membrane should be thin and
possess good adhesion to the substrate. Moreover, the screed aids in
the thermal insulation of the roof.
(ii) Above the screed, waterproofing membrane is provided to ensure
watertightness of the roof.
(iii) An insulation board may be placed on top of waterproof membrane for
thermal insulation. In cold weather condition where the loss of heat at
the roof is significant, the insulation board helps to reduce these
losses. On the contrary, in summer the roof is heated up by direct
sunlight and the insulation layer reduces the temperature rise inside
the pumping station.
10. In pumping stations one of the choices for the material of water
tanks is fibre-reinforced plastic (FRP). What are the advantages
associated with this kind of material?
There are two main advantages for FRP water tanks:
(i) It possesses high strength to weight ratio and this leads to the ease of
site handling.
(ii) It is highly resistant to corrosion and thus it is more durable than steel
water tank.
11. What is the difference among cement plaster, cement render and
cement screed? Under what situations should each of the above be
used? (PS2)
The purpose of plastering, rendering and screeding is to create a smooth,
flat surface to receive finishes like paint, wallpaper etc.
Plastering is the intermediately coating of building materials to be applied
on the internal facade of concrete walls or blockwalls.
Rendering is the intermediate coating for external walls only.
Screeding is the coating laid on floors to receive finishes like tiles, carpet,
and marble...
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