England · Statutory guidance
Structure: Approved Document A
Guidance on structural loading, foundations, walls, floors, roofs and disproportionate collapse.
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- 2004 edition incorporating 2010 and 2013 amendments
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Structure
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O N L I N E V E R S I O N
A1/2
Section 2D: Proportions for masonry
chimneys above the roof surface
Height to width relationship
2D1 Where a chimney is not adequately
supported by ties or securely restrained in any
way, its height if measured from the highest point
of intersection with the roof surface, gutter, etc.
should not exceed 4.5W, provided the density of
the masonry is greater than 1500kg/m3, where:
W is the least horizontal dimension of the
chimney measured at the same point of
intersection, and
H is measured to the top of any chimney pot or
other flue terminal (see Diagram 20).
Diagram 20 Proportions for masonry
chimneys
See para 2D1
Approved Document A Structure
O N L I N E V E R S I O N 35
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