8
INSTALLATION OF MARBLE AND LIMESTONE FIREPLACES
sub-hearth area is suitably sound
and secure. For all solid fuel fires
the hearth should be set in three
equal pieces to reduce the risk of
fracture from thermal shock.
fiTTinG ProcedUre
All stone components should have
mechanical fixing recessed to allow
full stone contact and downturned
into their top to restrain them
excluding the shelf. Each bond of
adhesive should have continuous
contact along its full joint and is
bonded to the masonry along all
of the back edge with the solid
wall, it is important that all joints
and bonded surfaces are clean and
suitably wetted/soaked to allow
the adhesive to set correctly and
in accordance with the
manufacturer’s instructions.
The shelf and other overhanging
components should be adequately
restrained in all instances as they
are liable to tip forward so it is
imperative this is securely fixed
back into the wall so there is no
possibility of any piece tipping
and falling.
for reGisTer GraTes
Installations not involving register
grates please proceed to the
next step.
Suitably reduce the fire chamber
prior to installing the register grate
to reduce the void between the
back/sides of the register grate
and the structural chamber. This
will later be back filled and
flaunched off.
Fix strawboard/corrugated
cardboard to the rear of the insert,
this covers and fits tight to the
complete back of the register grate
and finishes 25mm (1") above the
top of the burning area/firebrick.
Fit the register grate ensuring that
it is correctly positioned and
properly sealed all round using
fire cement. The front of the
register grate should sit on top of
the back edge of the hearth, in
such a position that will be
recessed behind and butting up to
the back of each jamb and the
frieze. Always allow a 3mm
expansion gap between the
register grate and the jambs.
Back fill the space between the
back of the register grate and the
wall of the fire chamber with
vermiculite/pearlite concrete
(6:1 vermiculite/cement or 10:1
pearlite/cement) to eliminate any
voids/ large spaces behind the
register grate fill level to top of the
back of the register grate.
Flaunch-off the top of the backfill
with 1:1:8 mix of cement/lime/sand
to form smooth slope to flue at an
angle of about 45 degrees.
installer tip
whilst the adhesive
is still drying, Keep
checKing the Jambs
are level
