INSTALLATION METHOD 2 (recessing into a non-combustible 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 the cavity insulation type (if applicable). If cavity insulation is of a loose fill variety, take
precautions to prevent excessive loss of material when the inner leaf is opened up by packing
the cavity firmly with a minimum 50mm of rockwool or glass fibre. This will hold back any loose
material now or in the future.
To maintain the structural integrity of the wall it is recommended that a suitable lintel is fitted.
It is sometimes possible to install this appliance without a lintel, depending on the type of wall.
The guidance of a qualified professional or local building control officer is essential to confirm
this.
Mark out the area of the proposed fireplace opening on the wall. Obtain a suitable concrete or
steel lintel from a builder's merchant. Drill four holes at the corners of the lintel position and
squarely over the fireplace opening, and if possible centrally under a block joint . Clear out the
block work in the area and insert the lintel by saw, or stitch drill and chisel. Do not dry bed the
lintel - always bed on mortar and securely slate pin. Clear out the block work from below the lin-
tel to form the opening for the cavity box of the fire to be inserted.
The top of the exposed area of cavity must be sealed against the ingress of moisture dripping
from above. The best way to do this is a cavity tray but an easier and quicker method is to affix
a 'Supalux' or equivalent board into the cavity. Slope the board towards the outside wall and sup-
port with screws, cement, 'Unibond' or silicone mastic etc. This will guide all moisture, harm-
lessly, to the outside wall. The exposed sides of the cavity must be packed with a suitable depth
(minimum 50mm) of glass fibre or rock wool to prevent draughts and heat loss, even if no loose
fill material is present. It is good practice to insulate the rear of the fire from the cavity to pre-
vent heat loss and condensation.
The non-combustible hearth may now be put in place. Again this should not bridge the cavity
where it projects into the wall space. Finally install the fireplace or fire surround and back
panel/marble to its finished location.
6
A- Opening Width; Max
440mm, Min 410mm
B- Opening Height; Max
580mm, Min 560mm
C- Recess Depth; 90mm
Outer Cavity Leaf
Superlux Board
Lintel
Inner Cavity Leaf
Non-combustible Backpanel
Superimposed Hearth
B
A
C
6.4
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