Cavity wall-Materials and construction

What is the primary purpose of the cavity in a cavity wall?

• To provide structural support
• To improve insulation and prevent damp
• To create additional living space
• To reduce the weight of the wall

Which type of brick is ideal for use below ground level?

• Facing bricks
• Common bricks
• Engineering bricks
• Sand lime bricks

What does "DPC" stand for in construction?

• Damp-proof course
• Drainage prevention course
• Durable panel construction
• Design performance coefficient

How does a cavity wall contribute to thermal insulation?

• By reflecting sunlight
• By trapping air in the cavity
• By absorbing heat
• By sealing all gaps

Which material is commonly used as insulation in cavity walls?

• Sand
• Fibreglass
• Concrete
• Timber

What is the recommended minimum height for a DPC above ground level?

• 50 mm
• 100 mm
• 150 mm
• 200 mm

Which type of block is commonly used for the internal skin of a cavity wall?

• Dense concrete blocks
• Facing bricks
• Sand lime bricks
• Lightweight insulation blocks

Which of the following is NOT a benefit of cavity walls?

• Damp prevention
• Thermal insulation
• Sound insulation
• Increased structural stability

What is the primary reason for using wall ties in cavity walls?

• To prevent cracking
• To hold the cavity insulation in place
• To bond the inner and outer walls
• To improve aesthetic appearance

What is the typical thickness of modern internal blocks in cavity wall construction?

• 75 mm
• 100 mm
• 125 mm
• 150 mm