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Flexible
chimney linings guidelines for fitting…
Good stove Ltd
Usually the flexible lining is constructed with two layers of
stainless steel the inside lining is directional. It is smooth
one way to the touch and the opposite direction has ridges and
sharp edges to the touch.
Looking up the chimney from the bottom or fire end of the liner
the sharp edges should be pointing down to you [sharp to the
touch as you put your hand up the chimney lining]. In this way
corrosive liquids and residues will run down the smooth lining
and into the fire rather than those liquids getting caught under
these sharp ridges of the liner.
It is desirable to backfill the liner, when in position, with
a suitable insulting material [before top plate is added]. filling
the chimney void and giving good liner heat retention and prevention
of condensation If the void is to large for a sensible amount
of material to be added then a suitable wrap insulation with
ties can be used to good effect. [Please ask us for information
on these materials]
The top of the liner should have the finishing piece inserted
into it [the insert] and the top plate [with hole] secured with
cement mix to the top of the stack. The clamp holds the liner
from dropping through the hole. When the liner has been fully
lowered to its desired height with a few inches of the liner
left including the rim of the insert standing proud of the plate.
Then a nice tapering rim of 6/1/1 mortar with lime can be used
to seal the liner against the plate etc making a water repelling
taper [shaped like a low volcano]. the rim of the insert can
finish flush with the mortar and a good weather proof seal can
be effected . It is important to prevent water travelling down
the outside of the flex liner and into the chimney void causing
damp and water damage to the masonry etc.
Void ventilation
If neither loose insulation or wrap insulation is to be used
then it is recommended that the inside of the chimney void be
given slight ventilation to allow a passage of air to travel
upwards and out of the cavity allowing the prevention of condensation
and damp to effect the internal masonry.
2 x 20mm holes in the register plate at the bottom of the installation
and 2 x pipe vents set at a slope in the chimney stack would
be suitable for this purpose.
Drill two holes 6 inches apart at a 45 degree angle into the chimney
stack approximately 1 3rd from the top of the stack .these slope
down wards when looking from top down . Tap 2 x pieces of copper
water pipe of suitable dimension into the holes, mortar sealing
around the inserted pipe if required. Leave 2-3 inches of pipe
protruding visibly sloping down. Water cannot enter the drilled
holes and will run down and off the protruding pipe vents. Air
in this way can circulate from the room below and up and through
the chimney void and escape from the copper pipe vents. |
