INSTALLATION M
METHOD 11 ((continued)
Centring on the pilot hole already drilled, core drill or chisel a hole 155mm diameter from the inside of the
wall. If loose fill cavity insulation material is present, the material will have to be retained by inserting 25 -
50mm of fibre glass or rock wool insulation tightly into the cavity. Where the cavity does not have such insula-
tion material it is still good practice to do the same to provide protection if it is introduced at a later date.
At this point, the false chimney breast should be installed, taking into account any guidance given in the sec-
tion on timber framed buildings as far as insulation and clearances are concerned. As a general rule, when the
false chimney breast is constructed from combustible materials, the cavity box must be insulated with 50 mm
of fibre glass wool or rock wool to the sides and rear and 100 mm to the top.
Finally install the fireplace or fire surround and back panel/marble to its finished location.
INSTALLATION M
METHOD 22 ((recessing iinto w
wall)
This method allows for installation of the appliance with the rear part recessed into the inner leaf of a cavity
wall. This should enable a standard fire surround and back panel/hearth set to be fitted to the wall with the
fire presented naturally in a flush fitted manner. The structural integrity of the wall must be maintained.
Check on cavity insulation type if installed to the house and if of the loose fill variety, take precautions to pre-
vent excessive loss of material when the inner leaf is opened up. Packing the cavity firmly with min 50mm of
rock wool or glass fibre should help hold back any loose material now or in the future.
To maintain the structural integrity of the wall, the fitment of a suitable lintel is recommended. It is sometimes
possible to install without a lintel depending on wall type, but the guidance of a qualified professional or local
building control officer is essential to confirm this.
A - Opening width Min.
40mm Max. 440mm.
B - Overall Width 480mm.
C - Opening Height Min.
555mm Max 575mm.
D - Overall Height 590mm
E - Recess Depth 187mm
F - Plasterboard protection
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