Combustible Walls; Installations In Timber Frame Buildings - Valor 474 Valentia Installation And Owner's Manual

6.1

COMBUSTIBLE WALLS

A. For installation on walls constructed or comprising combustible materials,
reference should be made to the requirements of BS 5440 and the Building
Regulations.
B. Timber Framed Housing: For a timber framed house, the fire can be installed as
directed in The Institute of Gas Engineers Utilization Procedure IGE/UP/7 GAS
6.2

INSTALLATIONS IN TIMBER FRAME BUILDINGS.

A. The combustible wall kit is suitable for walls in which the combustible part is not
more than 195 mm thick measured from the inside of the building.
B. The combustible wall kit required is RW number 994530, GC No. 154 759. If the
whole of the wall is of combustible material, the outer wall plate must be used,
requiring access to the outside of the building.
C. If the screws and the wall plugs supplied are not suitable for a particular
application, proprietary cavity wall fixings may be used.
D. Proceed as detailed in Section 6 for brick walls, EXCEPT for the following
points: -
(a) Cut the hole for the flue to a diameter of 178 mm through the plaster board
taking care not to damage the Vapour Control Layer (VCL).
(b) Cut the VCL 10 mm less in diameter than the hole just cut in the plasterboard.
This will ensure a seal around the flue liner.
(c) Continue the 178 mm diameter hole through the remainder of the combustible
material. If the outer leave of the wall is constructed of non-combustible material then
cut the hole 135 mm diameter making allowances for the shrinkage of the timber
frame.†
(d) Measure the thickness of the combustible part of the wall and cut the flue liner
to this length, cutting off the end without the fixing brackets. Fit the liner to the sealing
plate using the screws provided.
(e) Push the liner through the VCL taking care not to damage the VCL, and
ensuring that the liner DOES NOT protrude into the cavity by more than 10 mm.
(f) If the wall is wholly of combustible material, install the outer wall plate centrally
over the hole from the outside as shown in the diagram below. It is recommended that
a silicone sealing compound is applied to the inner face of the wall plate to provide a
watertight installation.
(g) Fit the flue, see the Fit Flue section in the Installation Instructions provided with
the appliance. NOTE: When determining the flue length, measure the wall thickness
from the face of the outer wall plate.
(h) Slide the rope seal over the flue, until it touches the back of the heater, prior to
removing the tape from the flue foam sealing strip.
(i) Before installing the flue into the wall is necessary to provide a moisture barrier
around the flue at the point which will be in the centre of the cavity. Either of the
following methods are acceptable: -
(i) Wrap a wire which will not cause corrosion tightly around the flue.
(ii) Form a bead of mastic or silicone around the flue.
©
GDC Group Ltd. 2014
INSTALLER GUIDE
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