The Installation Handbook - Howarth Timber

Table 2: Use of GTEC Universal Bonding Compound
Board Board Vertical Number of
thickness width centres dabs across
(mm) (mm) (mm) board
9.5 900 450 3
9.5 1200 400 4
12.5 900 450 3
12.5 1200 600 3
GTEC Movement Control Joint
Cavity barriers
Certain floor/ceiling constructions can allow the circulation
of air behind the GTEC Thermal Boards and air may also
enter at junctions with partitions and door/window frames.
This circulation can reduce the thermal performance of the
wall. Building Regulations Approved Document L requires
the application of continuous horizontal or vertical bands
of GTEC Universal Bonding Compound around the specified
wall perimeters, junctions and frames of linings to internal
faces of external walls.
Movement control joints
Movement control joints are required in wall linings at intervals
not exceeding 10 metres and where the drylining crosses or
abuts a structural movement joint. At movement control joints
leave a 12.5mm opening between the GTEC Thermal Boards
and apply a continuous vertical ribbon of GTEC Universal
Bonding Compound to each side of the joint, about 25mm in
from the edge of the GTEC Thermal Board.
Cut GTEC Movement Control Joint to length. Butt joint lengths
end to end where necessary. Attach to the GTEC Thermal
Bond surface with 13mm stainless steel staples at 150mm
centres. Apply GTEC Joint Filler or GTEC Allset in two coats
feathering out the edges of the second coat. After finishing,
remove the masking strip from the centre of the joint.
Thermal Board Linings (Direct Bond)
25mm
300mm
Insert GTEC Nailable Plugs as indicated
Installation
For GTEC Thermal Board linings, fix to wall with 2 nailable
plugs per panel - see diagram for fixing positions. To install
nailable plugs first drill two 6mm diameter holes through the
GTEC Thermal Board and GTEC Universal Bonding
Compound into the masonry background. Ensure each hole
goes through a dab and penetrates the masonry by at least
25mm. The maximum component thickness, including
plaster or render, GTEC Universal Bonding Compound and
GTEC Thermal Board that can be accommodated by each
size plug is as follows: 60mm GTEC Nailable Plug - 35mm,
80mm GTEC Nailable Plug - 55mm, 100mm GTEC
Nailable Plug - 75mm and 120mm GTEC Nailable Plug -
95mm. Insert GTEC Nailable Plugs and drive them just
below the plasterboard surface, ensuring that the
plasterboard paper liner remains intact.
Door and window reveals
Around door and window reveals of masonry construction,
direct bond the GTEC Thermal Board to the background,
as for main wall areas. Complete installation with a GTEC
Nailable Plug at top and bottom of each reveal.
THE INSTALLATION HANDBOOK 2008
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