Cavity Wall Construction

What is the collective term given to all work carried out above ground level?

• Substructure

• Superstructure

• Above Datum

• Walling

What document is issued in conjunction with a plan or working drawing and provides written information about the work to be carried out?

• COSHH statement

• Risk assessment

• Specification

• Time sheet

What would be placed between the two leaves of blockwork in footings before backfilling takes place?

• Insulation

• Lean mix concrete

• Mortar

• It is left hollow

Masonry cement should not be used in substructure walling because:

• It produces a mortar that is too light in colour

• It contains a plasticiser that weakens the mortar

• It is too expensive

• The curing time is too long

A strip foundation for a 300mm cavity wall is usually excavated to a width of:

• 450mm

• 600mm

• 750mm

• 900mm

What is the minimum distance a damp proof course should be positioned above ground level?

• 150mm

• 300mm

• 450mm

• 600mm

The three classifications of damp proof course are:

• Flexible, semi-flexible, rigid

• Brick, slate, plastic

• Flexible, semi-rigid, rigid

• horizontal, vertical, diagonal

What is the purpose of a core hole, as shown in the image?

• It allows air to ventilate the cavity

• It provides access to the concrete floor slab

• It allows for the cavity to be cleared of mortar droppings at the end of each day

• It is where air bricks will eventually be positioned

What is the minimum distance a tie iron should be bedded in to each leaf of a cavity wall?

• 25mm

• 50mm

• 75mm

• 100mm

Which of the following statements is correct with regard to tie iron spacings in a cavity wall with a cavity of 100mm?

• Tie irons should be spaced 450mm horizontally and 450mm vertically

• Tie irons should be spaced 900mm horizontally and 900mm vertically

• Tie irons should be spaced 450mm horizontally and 900mm vertically

• Tie irons should be spaced 900mm horizontally and 450mm vertically