Click on the photos for a larger view
Vermiculite is a very lightweight, high temperature insulant. It is mixed with cement in a ratio
of 6:1 to fill the void between the flue liners and walls. Use very little
water to make the cement mix. Alternately, use Perlite - 10:1 with cement
|
The liners are built up - but don't build up too many before filling the
cavity with Vermiculite cement.
|
Eventually the structure emerges from the roof line.
|
The photos below show the start of a flue formed from concrete liners. These are
larger than clay liners and are square in section.
|
The first concrete liner is bedded onto concrete
lintels that are spanning the chimney breast.
|
In this build the liners were not surrounded by vermiculite cement - no need.
|
The concrete liners are stacked one upon another.
The end result is the same - a gas tight flue.
|