will provide test certificates for published fire, sound and structural
data covering systems designed and constructed in accordance with
the Companys published specifications.
are conducted on Company systems to meet performance requirements
set down by regulatory authorities. System performance following
substitution of materials or compromise in design cannot be certified.
Failure may result under critical conditions.
Shaft Wall surfaces should be isolated with control joints or
other means where:
Type of construction changes within the plane of the Shaft
Provide control joints at 9 metre maximum centres. Ceiling-height
door frames may be used as control joints as may less than ceiling-height
door frames if control joints extend to ceiling from both corners.
Penetrations of the Shaft Wall by door frames and fire dampers
require additional reinforcement at corners to distribute concentrated
stresses if a control joint is not used. Where access panels or
large fire damper penetrations occur in shafts having pressure
loads, headers, sills and adjacent channels may require reinforcing
to properly distribute these loads.
Where Shaft Walls enclose lift and return air shafts, and intermittent
pressures up to 700 Pa are expected, sealant is recommended to
seal peripheries, at intersections with floor slabs, columns and
similar abutments, at penetrations, to minimize whistling and
dirt accumulation due to air movement.
Shaft Walls may be used for air handling with sustained pressures
up to 500 Pa (for pressures exceeding 350Pa, refer Boral Plasterboard
Sales Offices). Sealant selection, together with joint treatment,
surface coatings and details to seal the wall under these sustained
pressures, must be provided by the designer. When air pressure
exceeds 500 Pa, the air handling should be contained within a
Cavity Shaft Wall will accommodate outlet boxes with depths up
to the studs depth.
Boral Plasterboard Needle Point Type S and Drill Point Type D screws
are suitable for fixing plasterboard to 0.55mm, 0.8mm and 0.9mm
B.M.T. steel studs. Boral Plasterboard Drill point Type D screws
should be used for fixing plasterboard to steel up to 2mm uncoated
Screw lengths should be minimum 30mm for base layer, 45mm for face
layer and at least 10mm longer than the total thickness for other
applications. Boral Plasterboard Type L laminating screws should
be specified for laminating plasterboard to plasterboard, as required
in back blocking penetrations, closing to Jamb Struts and around
Runners and studs fixed to beams and columns should be installed
before steel is spray-fireproofed. Excess fireproofing should be
removed from runners, studs, beams and columns before installing
Shaft Wall Liner and applying sealant.
Steel door frames should be rust resistant coated and have throats
accurately formed to overall thickness of the Shaft Wall plus 2.5mm
minimum to 3.5mm maximum. Jamb fixing straps should be 3mm thick
mild steel welded to door frame. Screw fix steel Jamb Struts to
Apply Boral Plasterboard Jointing Compound just before inserting
face layer into frame. Do not terminate plasterboard against door
frame return. Provide bracing where required by installing diagonal
bracing from Jamb Struts to structure.
Screw fix Jamb Struts to door frame. Provide bracing where required
by installing diagonal bracing from Jamb Struts to structure.
Where Cavity Shaft Wall height exceeds maximum available panel height,
Shaft Liner Panel end joints should be positioned within the upper
and lower third of wall and joints reinforced with horizontal CH
Stud, cut to fit between adjacent vertical studs. Walls over 4.8
metres high should have studs screw-fixed to runners. Joints in
adjacent plasterboard sheets should be staggered top and bottom
to prevent a continuous horizontal joint.