4 External Render

How much sand is required for a 4:1 sand and cement mix if the total batch weight is 75kg?

• 15kg.

• 30kg.

• 45kg.

• 60kg.

A 25kg bag of one coat render covers 2.25m², how many bags are required to cover 135m²?

• 40.

• 50.

• 60.

• 70.

Hard lumps found in a mix of mortar could be a result of

• out of date cement

• too much plasticiser

• poorly graded sand

• too much lime.

Bagged cement should be stored off the ground to prevent

• air setting

• wet setting

• pack setting

• accidents.

A strong render mix should not be applied to

• a strong background

• a weak background

• dense concrete.

• EML.

Sea sand is not recommended for rendering because it

• is washed and well graded

• contains salt

• is too coarse

• is too fine

Galvanised beads are not recommended for rendering because they

• are expensive

• are only available in short lengths

• can rust

• don’t allow for a thick enough coat.

Which type of sand is generally preferred for a scratch coat?

• Sharp

• Silica

• Silver

• Soft

Which of the following additives equalises suction?

• Plasticiser

• Retarder

• Accelerator

• Waterproofer

What is the purpose of a frostproofer?

• To act as a plasticiser

• To act as a retarder

• To act as an accelerator

• To act as a bonding agent