Chimney Heat Monitors
Heat transfer is generally caused by faulty
chimneys, poorly or incorrectly fitted
liners and the addition of high flue gas
temperatures being generated by these
efficient stoves. The thatch is at a much
greater risk of the effects of heat transfer
if the chimney is not lined.
TAS-33 Thatch Alert Chimney Monitor
Systems can be installed to monitor the
temperature of the chimney brickwork
(heat transfer) at the point where it
meets the thatch. In the event of high
temperatures being recorded, the system
will trigger an audible alarm allowing the
homeowner to take action.
Heat transfer is further increased at
the point where the thatch meets the
chimney. This is due to the insulating
properties of the thatching material. The
heat transfer process can cause thatch to
smoulder and ignite if temperatures in
excess of 200oC are reached.
Fire Barriers
Physical fire barriers for thatched roofs
are designed to create a separation
between the thatch and the rest of the
building. The principle being, in the event
of a fire the thatch is seen as sacrificial.
In terms of fire resistance either a
fireboard or firewall membrane can
be used to achieve the required fire
resistance (integrity) and a noncombustible Thatchbatt® for further
fire protection as well as acoustic and
insulation values.
Both TAS100 fireboards and TAS firewall
membranes are designed to resist spread
of flame and penetration as set out in
BS476: Part 3: 2004 & CEN/TS 1187: 2012,
test 4. Both products are water resistant
and will reduce the potential water
damage that can be generated as part of
the firefighting process.
The TAS100 fireboards are normally used
for new builds, extensions or
Page 143 - Archetech
the brickwork of the chimney to the
thatch, this is known as heat transfer.