This method allows for installation of the appliance with the rear of the firebox 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 offi-
cer 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 mer-
chant. 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 lin-
tel - always bed on mortar and securely slate pin. Clear out the block work from below the lintel to form the opening for the
firebox 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 support 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 prevent heat loss and condensation.
The hearth may now be put in place (If fitted). 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.
Figure 6
Outer leaf of building
Non combustible back panel
Non combustible inside wall of building
Lintel
Figure 7
©
2013 Focal Point Fires plc.
6.4 INSTALLATION METHOD 2
(recessing into a non-combustible wall)
GB IE
7
