WorksheetsL1 Cavity - Air Bricks and Ties
Total questions: 11
Worksheet time: 11mins
Why do cavity walls need to be air tight?
To control carbon emissions
To keep vermin out
To hold the insulation in place
Prevent condensation
Identify this brick
Filter Brick
Flowing Brick
Air Brick
Core Brick
Why are air bricks used on cavity walls?
To provide air flow to the cavity
To provide air flow to suspended floors (dead spaces)
How many bricks in a square metre?
40
50
60
70
How many blocks in a square metre?
5
10
15
20
What material is a wall tie made from?
Mild steel
Galvanized steel
Reinforced steel
Stainless steel
What is the minimum distance a wall tie bedded?
25mm
35mm
40mm
50mm
What is the centre of a wall tie called?
Drip
Bend
'W'
Slip
What is the maximum distances wall ties should be spaced?
400mm horizontal
400mm vertical
450mm horizontal
900mm vertical
500mm horizontal
800mm vertical
300mm horizontal
800mm vertical
What type of block should be used to improve the thermal efficiency of a cavity wall?
Aerated lightweight
Dense
Trench
Hollow
What is the minimum height DPC should be bedded above ground?
75mm
125mm
150mm
225mm
