13.3 Mark out, where possible, centrally beneath a block joint
where the lintel is to be fitted. Unless lime mortar has
been used it will be necessary to drill four holes with a
masonry drill and then use a mechanical cutter such as a
‘SHARK’ saw to cut out the correct size of slot required
for the chosen lintel (see Fig 11.).
13.4 Fit the lintel and slate pin, leaving the wall above safe
and firm. Always bed the lintel on mortar, never on a dry
bed (see Fig 12.).
13.5 Remove the masonry below the lintel and clear all the
debris from the cavity. Construct the opening to the size
specified in Section 7.0 Non-Combustible Wall
Installation (see Fig 4.).
A Rockwool™ (or similar seal such as Superlux™ type
board) must be used to prevent the cavity insulation
coming into contact with the hot surfaces of the heater
(see Fig 2.).
Note: the cavity itself must not be bridged by any other
part of the fire other than the flue duct, however the
firebox may encroach into the cavity by up to 40 mm.
In all installations ensure that there is no structural
damage to the property or to the damp coarse.
Fig 13.
Fig 11.
Fig 12.
16
