INSTALLATION METHOD 3 (timber framed buildings)
Where removal of any part of a timber frame is undertaken the structural integrity of the wall
must be retained. The advice of your local building control officer should be sought. If the prop-
erty is under any NHBC warranty it is also advised that their advice on this kind of modification
is sought.
Either of the two preceding installation methods may be adapted for timber framed buildings,
providing extra care is taken in ensuring combustible materials are adequately protected from
the effects of heat.
The appliance must be installed in accordance with the British Gas documents DM2 and DM3 or
the Institute of Gas Engineers published procedure document IGE/UP/7.
Special attention must be paid to the location of studwork frames of the inner leaf and the appli-
ance positioned accordingly. Wires and pipes that run within the wall must also be taken into
account.
Installation as per method 1 (against inner wall)
When using this method of installation the following amendments should be incorporated.
A 75mm air gap or 75mm of insulation (e.g. rockwool) must be provided between combustible
materials and the sides and rear of the cavity box. A 100 mm air gap or 100mm of insulation
(e.g. rockwool) must be provided to the top of the cavity box. It is also a good idea to enable as
much airflow as possible, into and out of the area behind the fire without excessive heat loss
from the room when the fire is off.
7
Outer Cavity Leaf
Rockwool Insulation 75mm
sides and rear 100mm top
Inner Cavity Leaf
Non-combustible
Backpanel
Cavity Box
6.5
Superimposed Hearth
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