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8
9
10
Fireplace Opening
X
X
CONSTRUCTIONAL HEARTH
min 225mm
NON COMBUSTIBLE
125mm THICK MINIMUM
Z
Z = At least 150mm or to a
suitably heat resistant wall
8
10
non combustible wall
min thick Y
400mm (16")
Z
- 4 -
9
11
fireback and
insulated infill
Change in flooring
level to distinguish
hearth
C
A
Typical installation
Lintel or
Gather
Constructional Hearth
min 125mm thick
B
Clay Flue pipe
Fireback to
BS1251
min 75mm
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