INSTALLATION METHOD 2
This method allows for installation of the appliance with the rear part of it's firebox recessed
into the inner leaf of the cavity wall. This will enable a standard fireplace to be flush fitted to
the wall and the appliance will then be fitted flush into the fireplace. The structural integrity of
the wall must be maintained.
Check on the type of cavity insulation used, and if it is of the granular type then take suitable
precautions when opening up the wall not to allow excessive loss of insulation material from
the cavity. Packing the cavity with Rockwool should help hold back loose fill insulation material.
Unless lime and mortar has been used, it will be necessary to drill four holes with a masonry,
drill, and then use a mechanical cutter (Sharksaw) to cut out the correct size of 'slot' required
for the chosen lintel.
NOTE: Obtain a lintel 750mm long x 75mm deep x thickness of the inner leaf. We would sug-
gest either a pre-cast concrete or steel lintel; Catnic CN52 or CN46 depending on thickness.
Typical inner leaf weights when sizing a lintel over a 450mm wide opening are 90kg for 100mm
blockwork and 120kg for 125mm blockwork.
Plan to minimise disruption to occupants and protect any other parts of the building against
dust infiltration. Areas that are opened up will need to be protected against rain or snow during
the work and if there is a risk of frost, replacement brickwork will require protection until mor-
tars have hardened.
Set out where possible centrally beneath a block join
as shown. Use a drill for guide holes, and a 'shark
saw' or angle grinder to form an opening to suit the
lintel.
The lintel should be inserted and securely slate
pinned, leaving the wall above safe and firm.
Note: Always bed on mortar, DO NOT dry bed.
Remove all masonry from below the lintel, and
clear debris from the cavity.
The top of the exposed cavity must be sealed with
Superlux board or a similar non-combustible materi-
al. The board should be fixed at an angle, lower at
the back, so as to direct any moisture coming down
to the outside wall. This board should be fixed with
screws, Unibond, or a similar adhesive. It is impor-
tant to fit this board or a cavity tray to protect the
property and the appliance from drips of water. The
sides of the opening where the cavity is exposed
should be packed with Rockwool or similar non-
combustible material to a minimum depth of 50mm.
The Rockwool packing must extend from the base of the opening to the Superlux board.
The non-combustible hearth should now be formed or secured in place.
8
8.4
©
2009 Focal Point Fires plc.
