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Parapet walls

The minimum thickness and maximum height of parapet walls should be as indicated in the diagram below.

If the criteria indicated below cannot be attained design calculations should be submitted to indicate suitability.

Cross section of cavity wall showing height of parapet walls

Type A cavity wall

Thickness Parapet height H to be not more than
t1 + t 2
equal or less than 200
600 millimetres
t1 + t 2
greater than 200
equal to or less than 250
860 millimetres

Cross section of solid wall showing height of parapet walls

Type B solid wall

Thickness Parapet height H to be not more than
t=150 600 millimetres
t=190 700 millimetres
t=215 860 millimetres

Note: t should be less than or equal to T

Note, the above guidance relates only to structural aspects of parapet wall design.

Further advice should be obtained with regard to moisture penetration.