The Installation Handbook - Howarth Timber

STUD
Max. Height Guidance Table (m)
12.5mm Plasterboard
1 Layer of 2 Layers of
Plasterboard Plasterboard
IS50/RX 2.4 2.7
IS60/B 3.0 3.9
IS70/B 3.6 4.5
IS90/B 4.5 5.4
Preparation
Set out the Lafarge GTEC Independent Wall Lining System
inside the external wall construction; allow a minimum cavity
width of 10mm between the external wall and the back of the
metal framing, or to the insulation if the thickness of the
insulation is greater than the width of the framing.
Note: ensure that the walls are appropriately treated for any
dampness.
Insulation
Where required, insert mineral wool batts into the framing
within the flanges of the studs and tracks. Ensure that they
are fully inserted into the framing, and that the cavity
between the lining and the external wall is maintained.
Where batts are thicker than the framing width, fit the batts
with the exposed face level with the face of the framing.
The back edges of the batt should be pushed onto the rear
flanges of the track and I stud components. GTEC Insulation
Hold Strips can also be used to hold quilts and narrower batts
in position; fit 150mm from top of lined wall, and thereafter
at 1200mm vertical centres using GTEC Wafer Head Self
Drilling screws. The use of GTEC Vapour Board should be
considered to control condensation.
Existing Wall
Plasterboard
Insulation tucked
into GTEC I Stud
Movement Control Joint
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
plasterboards and use GTEC I Studs on each side of the joint
to support the plasterboard edges.
Cut GTEC Movement Control Joint to length. Butt joint lengths
end to end where necessary. Attach to board surface with
13mm stainless steel staples at 150mm centres. Apply GTEC
Joint Filler or GTEC Allset Extra in two coats, feathering out the
edges of the second coat. After finish-ing, remove the masking
strip from the centre of the joint.
Internal Corners
THE INSTALLATION HANDBOOK 2008
15