Insulating Chimney Liner Installations
There are many differing opinions regarding the use of
insulation with chimney liner installations. Some insist on it,
others insist on not using it.
In our experience, the majority of installations do not need
additional insulation. The air between the liner the the stack warms
and act as insulation itself.
We recommend only using additional
insulation where the stack is either very high, very large or
external in an extremely exposed position.
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Micafil -
Description and Usage
Micafil is a lightweight expanded
mineral. It is fireproof, fibre free and safe. Typical uses include loft
insulation, internal cavity fill, garden use and packaging of liquid and
hazardous goods. Micafil mixes with cement to form lightweight concrete
- ideal for insulated floors screeds and filling around chimney flues
and boilers. It may also be used with gypsum to produce a backing
plaster.
Loft Insulation
Poured straight from the bag, Micafil simply flows into and over all
potential loss areas covering the whole loft floor with a continuous
heat trapping carpet of insulation. Micafil can be laid over existing
insulation where it seal and covers to any depth. 10 bags will cover
10m² to a depth of 100mm
Internal Cavity Fill
Use Micafil within dry cavities to improve thermal and sound insulation.
Used as an aggregate with Portland
cement, Micafil forms an ultra lightweight concrete suitable for many
non structural applications. Mix 1 bag Micafil with 1 bag cement dry
before sprinkling over 23 litres of water whilst mixing.
Floor and Roof Screeds
Micafil concrete can be laid over many sub-bases to provide an insulated
and resilient floor. It may be used to advantage over suspended floors,
for infill to accommodate different levels, or where fire resistance is
important. Always use a protective topping when used for floors.
Firebacks and Chimney Linings
Micafil concrete is ideal as filler to insulate around flue linings,
behind firebacks and around pipes when fitting heaters. Use also to fill
between brickwork flue and lining.
Home and Garden
Mix Micafil, 1:4 with compost to improve water holding of hanging
baskets and patio tubs. Use Micafil to store fruit, bulbs and tubers.
Micafil is an ideal barbeque base - it insulates, reflects heat and
absorbs fat.
Industrial Packaging
Use Micafil as the filler around hazardous goods in approved box
systems. Highly absorbent fireproof and inert, any spillage is quickly
absorbed by Micafil, thus retaining liquid within the inner container.
How many bags do
you need ?
Use the table below to calculate how many bags you'll need.
Chimney Liner
Insulation Jackets
Liner insulation jackets
are
used as an alternative to Micafil for insulating multi fuel liners. They
are manufactured from non combustible Rockwool and are sold in 1 metre
lengths. The insulation thickness is 30mm and joints and seams need to
be sealed using 75mm wide aluminium foil tape.
Liner insulation jackets are particularly suited for use in large stacks
where the volume of Micafil required would be prohibitive.
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