2. Now complete these sentences with the properties:

1. The polythene membrane can prevent moisture from rising into the concrete floor. This means that polythene is ….

2. The T-shaped aluminium section can resist chemical action, i.e. aluminium is ….

3. The stone block cannot be lifted without using a crane. This means that stone is ….

4. The corrugated iron roof cannot prevent the sun from heating up the house, i.e. iron is …

5. Glass wool can help to keep a house warm in the winter and cool in the summer, i.e. glass wool is …

6. The ceramic tiles on the floor cannot be scratched easily by peo­ple walking on them. This means that ceramic tiles are ….

7. Asbestos sheeting can be used to fireproof doors. In other words asbestos is …

8. Black cloth blinds can be used to keep the light out of a room, i.e. cloth is …

3. Make sentences about other properties of materials from this table.

Steel	has the property of	good sound insulation.
Stone		good thermal insulation.
Glass wool		high compressive strength.
Brick		high tensile strength.

This means	it can resist high compressive forces.
	it can resist high tensile forces.
	it does not transmit heat easily.
	it does not transmit sound easily.

4. Answer the following questions.

Why is glass used for window panes? Because glass is ….. Why is glass wool used to keep the heat in hot-water tanks? Because glass wool has the property of …. Why is some steel covered with a thin layer of zinc? Because zinc is ….. Why are some fire doors covered with asbestos sheets? Because asbestos is …. Why are some metal sheets formed into a corrugated shape? Because the corrugated shape makes the sheet … Why is concrete used for the columns of a building structure? Because ….

Task 7. Look and read:

These are drawings of the three types of components used in building:

1. Study the diagrams of building components and classify these building components into three types:

• Section

• Unit

• Compound unit

B. Now read the dialogue. Copy and complete this table to classify the components:

	Section	Unit	Compound unit
Name of the component