Jan 02

Plasterboard and Cornice

BGC Plasterboard is an interior lining material which provides a blemish free, monolithic surface ready for decorative paint and thin cover finishes for both commercial and residential applications.

BGC Plasterboard is manufactured using a gypsum core covered with a linerboard which is wrapped around the gypsum to protect the core.

Complementing its plasterboard sheet range, BGC Plasterboard manufactures a range of cove and decorative cornices which provide a solution for the finishing of joints between walls and ceilings.

BGC Plasterboard:

  • Interior wall lining system
  • Suitable for residential & commercial applications
  • Cost effective
  • Ready for decoration
  • Quick and simple to install
  • Excellent acoustic performance
Product Information

BGC Plasterboard is purpose designed as a complete plasterboard wall and lining system, which complies with the requirements of the Building Code of Australia (BCA).

BGC Plasterboard has been tested by the CSIRO (Manufacturing & Infrastructure Technology) in accordance with AS 2588 – 1998: Gypsum Plasterboard; see report DTS698, April 2003.

BGC Plasterboard interior lining provides a blemish free, monolithic, smooth surface ready for decorative paint and thin cover finishes for homes, offices and institutional buildings.

BGC Plasterboard is to be installed as detailed in AS 2589:2007 ‘Gypsum Linings – Application and Finishes’.

Support framing must conform to the BCA and Australian Standards, be plumb, true and level, prior to the application of the plasterboard, see table 2 page 7. Refer to section 4.2.2 AS2589:2007

BGC Plasterboard may be fixed to timber or CFS (Cold-Formed Steel) light-steel framing or masonry, using plasterboard screws, nails and or adhesive.

Only screws or nails must be used for tiled areas and over existing lining or vapour barriers.

Jointing is effected with Plaster Cement Jointing Compounds and paper tape, to give reinforced crack resistant and seamless surfaces.

Key Benefits

  • Cost effective, easy to install drywall system.
  • Seamless, smooth monolithic appearance.
  • Excellent fire resistance and acoustic performance.
  • High serviceability performance.

Plasterboard Finish Selection

Selecting the level of finish of the interior lining depends on the function of the space, lighting and the desired decorative surfaces required.

For most applications, Finish Levels 4 or 5 are used, as detailed in AS 2589:2007.

Level 3 is used, where heavy to medium texture finishes are applied and the lighting is non-critical.

Level 4 is most commonly used in commercial and residential work, where the finishes are satin, flat or low sheen paint systems and the lighting is non-critical.

For large area walls and ceilings, where critical and severe glancing lighting have an effect, a Level 5 finish must be used to minimize any adverse effects of harsh lighting.

Early Fire Hazard Indices

BGC Plasterboard has been tested by the NATA accredited AWTA for fire resistance in accordance with AS 1530.3; see Report Test Number: 7-518246-CN, April 2003.

Ignitability Index – 13
Spread of Flame Index – 0
Heat Evolved Index – 1
Smoke Developed Index – 3

Sheet Sizes 

THICKNESS(mm) & PRODUCT WIDTH(mm) SHEET WIDTH (mm)
2400 2700 3000 3600 4200 4800 5400 6000
10 Plasterboard 1200 x x x x x x x x
1350 x x x x x
13 Plasterboard 1200 x x x x x x x x
1350 x x x x
10 Ceilingboard 1200 x x x x x x x x
1350 x x x x x x
10 Water ResistantPlasterboard 1200 x x x x x x x
1350 x x x x x
13 Water ResistantPlasterboard 1200 x x x x x
1350 x x x
13 Fireboard 1200 x x x x
16 Fireboard 1200 x x x x
10 Moisture ResistantFlameboard 1200 x x
1350 x
13 Wet Area Fireboard 1200 x
16 Wet Area Fireboard 1200 x x x
10 Soundboard 1200 x x
1350 x
13 Soundboard 1200 x
6.5 Curveboard 1200 x
13 Impactboard 1200 x

Some sizes may not be available in all states, please check with your local BGC Plasterboard office for availability. 

Installation

BGC Plasterboard recommends that this section should be read in conjunction with the architects’ specifications to determine the Level of Finishes.

BGC Plasterboard should be installed after all preceding trades have been completed.

Ceilings should be installed first. BGC Ceilingboard should preferably be fixed with their long edges perpendicular to the windows or light sources, to obviate unwanted light reflections across the joints.

For the walls, BGC Plasterboard sheets should be laid with their long edges horizontal, to minimise the number of joints as well as light reflections across the joints. This is most important when Finish Levels 4 or 5 are specified, as indicated in Table 2 page 7.

BGC Plasterboard may be cut by scoring the face side and snapping back away from the score. Then cut the paper on the second side following the original score line. Neat straight cuts can be made using a straight edge.

The cut edges should be sanded smooth to form clean joints.

Control joints should be set at twelve (12) metres maximum, or at construction joints, which ever is the lesser (refer page 6).

Control Joints

Control joints must be installed in walls and ceilings at a maximum spacing of 12m, or at control/construction joints, whichever is the lesser.

Architectural features, openings, and the like may be used as control joint set out points.

Rondo ‘P35’ or MBS ‘PXJ-30’ are suitable control/ expansion joints.

Control joints are centrally located across the 15mm minimum gap between adjacent BGC Plasterboard sheets, and the flanges nailed at 300mm centres to the framing behind.

Framing

BGC Plasterboard may be fixed to timber, CFS light steel framing or furring channels, which satisfy the BCA requirements and which have been plumbed true and straight.

Timber framing must comply with the requirement of AS1684 ‘National Timber Framing Code’ and AS1720.1&.2 ‘Timber Structures’ and have a moisture content less than 16% at time of lining.

CFS light-steel framing must be in accordance with AS/NZS4600 ‘Cold-Formed Steel Structure Code’, AS3623 ‘Domestic Metal Framing’ and AS1397.

BGC Plasterboard may be fixed to CFS steel framing not exceeding 1.25mm BMT. Framing members must have a 35mm minimum face width for nail fixing and 32mm for screw fixing.

Steel Frame Application

Framing

Frames must be plumbed true and straight, to comply with the degree of finish required of the BGC Plasterboard.

The tolerance deviation over 1.8m spans, along and across members, for 90% of the wall and ceiling framing, shall be as set out in Table 2.

Frame Alignment Deviation – Table 2

LEVEL 3 AND 4 LEVEL 5
Deviation of
90% of area
(mm)
Deviation of
remaining area
(mm)
Deviation of
90% of area
(mm)
Deviation of
remaining area
(mm)
4 5 3 4

Maximum spacing of framing members depends on the structural requirements for the building, in accordance with AS1170 and AS4055, however the maximum allowable spacing for studs, joists, furring channels or battens shall be as set out in the Table 3.

Spacing of Frame Member  – Table 3

THICKNESS
(mm) & PRODUCT
APPLICATION MAX. SPACING
OF FRAMING
MEMBER (mm)
10 Plasterboard Walls 600
Ceilings 450
13 Plasterboard Walls 600
Ceilings 600
10 Ceilingboard Walls 600
Ceilings 600
10 Water Resistant
Plasterboard
Walls 600
Ceilings 450
13 Water Resistant
Plasterboard
Walls 600
Ceilings 600
13 Fireboard Walls 600
Ceilings 600
16 Fireboard Walls 600
Ceilings 600
10 Moisture Resistant
Flameboard
Walls 600
Ceilings 450
13 Wet Area Fireboard Walls 600
Ceilings 600
16 Wet Area Fireboard Walls 600
Ceilings 600
10 Soundboard Walls 600
Ceilings 450
13 Soundboard Walls 600
Ceilings 600
6.5 Curveboard* Walls 450
Ceilings 450
13 Impactboard Walls 600
Ceilings 600

Trimmers are to be used where the main structural members change direction and all openings must be framed.

*Refer to the Curveboard brochure for further information on spacing of framing members as this may change depending on the angle of the curve required.

Adhesive, Nails or Screws

BGC Plasterboard may be fixed to the framing with either adhesive and nails or adhesive and screws as appropriate.

Water-based acrylic gypsum plaster adhesives such as BGC Stud Adhesive, which comply with AS2753, are suitable for fixing BGC Plasterboard to both metal and timber framing

Adhesive fixing is used in conjunction with fasteners, except for wet and tiled areas, fire-rated construction, over vapour-barriers or existing work, where mechanical fasteners, nails or screws only must be used.

The position of daubs of BGC Stud Adhesive ‘O’ and permanent fasteners ‘X’ should be as set out as shown in the Table 4.

Position and Number of Adhesive Daubs and Fasteners Across Sheet – Table 4

SHEET WIDTH
(mm)
WALL INTERNAL
CEILINGS
EXTERIOR
CEILINGS/
GARAGES
1200 XOOOOX XOOXXOOX XOXOXOX
1350 XOOOOX XOOXXOOX XOXOXOX

Ensure that contact surfaces are free from grease, oil, dust or other loose material prior to placing BGC Stud Adhesive daubs (always clean down steel furring before fixing plasterboard sheeting).

Galvanised 2.8mm standard or ring-shank clouts are used to fix the BGC Plasterboard to timber, see Table 5.

Minimum Nail Fastener Length – Table 5

THICKNESS
(mm)
SUBSTRATE MATERIAL
HARDWOOD SOFTWOOD
10 2.8mm x 30mm galvanised nail or
2.8mm x 25mm ring shanked nail
2.8mm x 40mm galvanised nail or
2.8mm x 30mm ring shanked nail
13 2.8mm x 30mm galvanised nail or
2.8mm x 25mm ring shanked nail
2.8mm x 40mm galvanised nail or
2.8mm x 30mm ring shanked nail
16 2.8mm x 40mm galvanised nail 2.8mm x 50mm galvanised nail

A full mechanical fastening system may be necessary in regions experiencing high loads on external ceiling areas such as carports, garages and verandahs.

Framing

Needle-point (NP) or self drilling and tapping point (SDP), bugle-head screws are used to fix to CFS light steel framing, and must comply with AS3566, see Table 6.

Minimum Screw Fastener Length – Table 6

THICKNESS
(mm)
SUBSTRATE MATERIAL
HARDWOOD SOFTWOOD STEEL
SCREW LENGTH mm SCREW GUAGE NO. SCREW LENGTH mm SCREW GUAGE NO. S SCREW LENGTH mm SCREW GUAGE NO
10 25 needle point
(see note 1)
6 30 Type W
(see note 1)
6 25 S point
(see note 1)
6
13 25 needle point
(see note 1)
6 30 Type W
(see note 1)
6 25 S point
(see note 1)
6
16 30 needle point 6 45 Type W 6 20 S point 6
  1. Screws used for fixing plasterboard to timber ceiling substrates (hardwood and softwood) shall have a minimum length of 30mm.
  2. S point screws shall be used for steel thickness less than or equal to 0.75mm base material thickness (BMT).
  3. Drill point screws shall be used for steel thick ness greather than 0.75mm base material thickness (BMT).

Note: When fixing into preservative treated timbers, Class A AS 3566 coatings of screws and nails are to be used.

Fixing to Framing

Walls

Daubs of BGC Stud Adhesive, 25mm diameter x 15mm high are positioned in the pattern as shown in Table 4, spaced at a maximum of 300mm and a minimum of 200mm.

BGC Stud Adhesive must not be used at wall-to-wall and wall-to-ceiling junctions, around openings, butt joints or fastener points.

BGC Plasterboard is placed horizontally along each wall. Sheets to be packed 6-10mm from floor and fastened along the top recessed edge at each stud or furring channel.

The sheets are then pressed firmly against the studs and temporary fastened midway across the sheet at every second stud or furring channel.

Next, fasten the other recessed edge at each stud, or furring channel.

Fasteners must not coincide with BGC Stud Adhesive daubs, and fasteners should be kept to a minimum distance of 200mm from adhesive daubs.

Fasteners around openings should be placed at a maximum spacing of 300mm centres. Allow at least 24 hours for the adhesive to set.

Interior Ceilings

BGC Stud Adhesive, 25mm dia. x 15mm high, are positioned in the pattern as shown in Table 4, spaced at maximum of 250mm and minimum of 200mm centres.

BGC Stud Adhesive must not be used at wall-to-wall and wall-to-ceiling junctions, around openings, butt joints or fastener points.

BGC Ceilingboards are placed at right angles to the ceiling joists, battens or furring channels, and fastened along one recessed edge at each joist, batten or furring channel.

Next, press the sheets firmly against the framing, and fix two nails (for timber framing) or one screw (for CFS steel framing), along the centre of the sheet at each framing member.

Then, fasten off the sheets along the other recessed edge, at each framing member. Fasteners must not coincide with BGC Stud Adhesive daubs, and fasteners should be kept to a minimum distance of 200mm from BGC Stud Adhesive daubs.

Where allowed, fasteners at butt joints and around openings should be placed at a maximum spacing of 150mm for nails and 200mm for screws.

Allow at least 24 hours or 48 hours in slow drying weather, for the BGC Stud Adhesive to cure.

Ceiling Sheet Application

Exterior Ceilings

An exterior ceiling covers areas outside the main enclosed living area of a house such as entertainment areas (Alfresco), carports and garages.

The different environments of exterior ceilings are often severe and can be effected by:

  • The generally constant high humidity,
  • The climate of the region,
  • Wind loads,
  • Garage Roller Door Vibration,
  • Insufficient perimeter support.

To overcome potential problems in these areas it is important to consider the following points:

  • The correct choice and installation of lining materials, fasteners, jointing and coating materials, designed to suit the environments,
  • Correct placement and installation of battens and installation methods,
  • The design and detail of the structural components and their protection from moisture,
  • Final paint decoration.
Condensation
Surface condensation and wind loads can be the main causes of lining board and jointing system failure. Insufficient protection can lead to the plasterboard distorting as well as potential mould attack.
Use sarking or foil backed insulation underneath metal roofing as metal is more susceptible to condensation build up than roofing tiles.
It is important that ceiling cavity areas are well ventilated to prevent condensation build up. The installation of eave and gable vents, roof ventilatiors etc. can assist in this by providing permanent cross flow ventilation.

Building materials and systems may be adversely affected by these severe environmental and physical conditions, which if not installed correctly can lead to ceiling failure and or collapse.

Plasterboard Materials

BGC 10mm and 13mm Water Resistant Plasterboard, 10mm Moisture Resistant Flameboard, 10mm Ceilingboard and 13mm Plasterboard may be used as suitable lining materials in exterior ceiling areas.

Installation

All perimeters must have appropriate framing/noggings etc. In order to support all sheet edges. Perimeters to be screw fixed only at 300mm centres. The perimeter may be fixed out with timber noggings, metal plasterers angle (Rondo P18) or equivalent.

Plasterboard sheets fixed to exterior ceilings must be either mechanically fixed with appropriate screws or using the 1/3 spacing method using appropriate screws and stud adhesive as per AS/NZS 2589:2007. Paper tape must be used in conjunction with setting type base products in the recessed joins. Base and topping to comply with ASTM C475. All trowelled joins to be back blocked in accordance with AS/NZS 2589:2007.

Plasterboard sheets to have a minimum 6-10mm space from perimeter walls.

Fascia boards/perimeter beams should continue at least 20mm below the bottom of the plasterboard ceiling or the perimeter wall/ceiling trim.

Framing centres to be at a maximum of 450mm.

Ceiling Area

For long runs of sheets and or large sheet areas, with set joints, movement control (expansion) joints must occur at maximum prescribed distances.

Generally, set joint areas should not exceed 20m2, with a maximum distance of 3.6m across the sheets and a maximum of 5.4m along the sheets.

1/3 Fixing

Garage Areas

Roller/tilt door operation can result in differential movement due to vibration resulting in positive joint cracking and adhesive breakdown/failure.

While the finish and appearance of these areas remains the same as ceiling in habitable areas additional details are required.

BGC Plasterboard recommends the use of Water Resistant Plasterboard with 1/3 fixings.

  • Screw and glue fix only.
  • Back block all joints.
  • Use of proprietary branded quality sealer prior to painting.
  • Use wet area base coats in jointing system.

Considerations

Before lining the building it is prudent to consider the following design and construction issues:

  • Consideration must be given to the framing, this may vary throughout Australia especially in high wind and coastal areas.
  • It is highly recommended to batten out the ceiling with Rondo 16mm metal battens or 16mm Furring Channel or 28mm Furring Channel or equivalent. These are to be fixed on the appropriate direct fix clips.
  • High-pressure differentials across a wall, may cause the wall to bend and move.

Ensure that wall and ceiling areas do not exceed maximum allowable areas, heights or lengths, and provide movement and or relief control joints where necessary.

  • Decoration is as important as the plasterboard installation and is vital in protecting both plasterboard and the set trowelled areas. The surface of the installed plasterboard ceiling should be decorated with an approved exterior grade paint. Please refer to your paint manufacturer for the appropriate grade required.

Alfresco Coffer Detail

Eaves Details – Casing Bead

Timber Stop

Back Blocking

Back blocking is used to reinforce unsupported butt or recessed joints and must be positioned midway between supporting members, in ceilings and walls.

Back blocking must be used in open areas of ceilings (back of recessed joints) with 3 or more joints and where there is a likelihood of excessive shrinkage and movement in the structure.

Black Blocking Procedure For Recessed Edge Joins

  1. Cut back blocks at least 200 mm wide and long enough to fit between the framing members with a gap not greater than 30 mm at each end.
  2. Apply BGC Back Blocking Cement over the full face of the back block. A notched spreader providing 6 mm × 6 mm beads at approximately 20 mm centres at right angle to the joint would be satisfactory.
  3. Fix the plasterboard to framing members.
  4. Place back blocks centrally along the full length of the board edge.
  5. Immediately after the back blocks are in place, fix the next sheet.

Alternatively, ceilings back blocks may be cemented into position from above the ceiling after the sheets have been fixed and before they are flush jointed.

 Back Blocking Procedure

Jointing Application

Paper tape joints produce stronger and more enduring results than those that are set with fibreglass tapes.

BGC Plasterboard recommends the use of paper tapes.

  • Self-adhesive paper tapes should not be used.
  • Where fibreglass tape joints are used, they must be back

blocked before the joints are set (in accordance with the instructions set out in Back Blocking, page 12).

Tape & First Coat

Apply the BGC Base Coat bedding cement to fully fill the
recess of the joint.

Centrally bed the perforated paper tape into bedding coat and remove any air bubbles. Apply additional cement and cover lightly with BGC Base Coat.

Stop-up all fixing points and apply BGC Base Coat to any damaged areas.

Allow the BGC Base Coat to set and dry for a minimum of 24 hours in damp or humid conditions or 1 hour for setting type cements (or as per compound manufacturer’s recommendation).

Second Coat

Lightly sand the first coat.

Check the Level of Finish required in the architects’ specification, before applying the second coat as detailed in Plasterboard Finish Selection (page 4).

Apply a second coat of BGC Base Coat 180mm wide over the joints, making sure to feather out the edges.

Apply a second coat to all fasteners and damaged areas, feathering out by about 25mm.

Allow the second coat to set and dry for a minimum of 24 hours or 1 hour for setting type cements (or as per compound manufacturer’s recommendation).

Third Coat

Lightly sand the second coat.

Apply a thin finish coat of BGC Top Coat centrally over second coat, after it has set and hardened. Dampen the outer edges of the finish coat, with a sponge to feather out the BGC Top Coat about 280mm approx wide.

Apply a thin final coat of BGC Top Coat over all fasteners and damaged areas.

Sanding and Finishing

Allow the BGC Top Coat to dry at least 24 hours.

Lightly sand smooth with 150 grit paper or with 220 sanding mesh.

Wipe off excess dust with a slightly damp cloth.

BGC Plasterboard will perform to the architects’ specification and the Australian Building Codes, provided all procedures are followed as per the compound manufacturers’ specification.

Decoration

BGC Plasterboard does not recommend spray painting to achieve level 4 or higher finish.

Ensure all stopping of joints and nail holes is completed to AS/NZ 2589:2007.

Brush down area prior to painting to ensure board is free from sanding dust.

Roller apply a proprietary branded quality sealer, to the entire sheet area including joints, followed by two coats of full weight flat acrylic paint.

Choice of colour should be considered carefully – darker colours will exacerbate any defects and highlight any imperfections.

Where high humidity is of concern, ensure the chosen painting system will protect joints from moisture absorption.

Cove Cornice

BGC Plasterboard Cove Cornice is designed to give a clean continuous line at the junction of walls and ceilings, and can be used with confidence on both Plasterboard lining and cement plastered walls alike.

BGC Plasterboard Cove Cornice is made of a plaster core with paper face to complement BGC Plasterboard and Ceilingboard. Cove Cornice should be fixed using BGC Cornice Cement with few special tools required.

The use of a mitre box and hand saw for cutting internal and external corner mitres is recommended.

Cove Cornice Sizes – Table 7

SIZE
(mm)
LENGTH
3000 3600 4200 4800 5400
55 x x x x x
75 x x x x
90 x x x x x

Decorative Cornice

The Decorative Cornice range from BGC Plasterboard adds the finishing touch to the interior décor of your new home or renovation.

Esperance provides a timeless design suiting many different styles of home. The soft undulation of the curve provides a stylish finish to any room.

For the bolder finish, don’t look any further than the Albany decorative cornice. With dramatic steps and bold curves, Albany creates an eye catching feature in a room.

Decorative Cornice

Decorative Cornice Sizes – Table 8

DESIGN SIZE
(mm)
LENGTH mm
4800
Esperance 75 x
Albany 95 x

Fixing

Clean down area where cornice is to be applied, remove any excess render or loose material.

Mark a guide line to suite the bottom edge of the cornice (90, 75 or 55 down) and pre-cut lengths as required.

All corner joints, internal and external, are to be mitred.

Where butt joints are unavoidable, ensure both ends are prepared to align accurately.

Apply (butter) a 10mm bead of cornice cement to both long edges and ends of the cornice.

Locate cornice to guide lines and temporarily block as required.

Fill mitres, cleaning off excess cement as you go.

Remove temporary blocking after BGC Cornice Cement has set.

Apply second topping coat to mitres and joints as required.

Note: only ever butter one length at a time and install immediately.

Contact surface may require damping down prior to fixing cornice, depending on drying conditions.

BGC Plasterboard is a proud Australian owned manufacturer of Plasterboard products.
BGC has state-of-the-art manufacturing facilities in Perth and distribution centres in all states of Australia and in New Zealand.

Our distribution network ensures that our entire product range is readily available in all states of Australia.
BGC has a team of technical specialists who can assist with all specification and design information.

Find Out More

Dec 29

NULINE WEATHERBOARD

NULINE IS A UNIQUE, WEATHERBOARD-STYLE CLADDING SYSTEM THAT LOOKS LIKE REAL TIMBER WEATHERBOARD, BUT DOESN’T COME WITH ANY OF THE MAINTENANCE ASSOCIATED WITH NATURAL TIMBER WEATHERBOARD CONSTRUCTIONS.

NULINE IS A UNIQUE, WEATHERBOARD-STYLE CLADDING SYSTEM THAT LOOKS LIKE REAL TIMBER WEATHERBOARD, BUT DOESN’T COME WITH ANY OF THE MAINTENANCE ASSOCIATED WITH NATURAL TIMBER WEATHERBOARD CONSTRUCTIONS.

THE NULINE WEATHERBOARD EXTERNAL CLADDING SYSTEM:

  • FEATURES A LEVEL JOINING SYSTEM, WHICH GIVES A SEAMLESS FINISH
  • IS QUICK AND EASY TO CUT, HANDLE AND INSTALL
  • COMES IN TWO DIFFERENT PROFILESOFFERING ‘DESIGN’ CHOICE
  • IS DURABLE
  • WON’T ROT OR DECAY
  • IS LOW MAINTENANCE
  • OFFERS A RANGE OF ATTRACTIVE CORNER AND END FINISHES
  • IS ENVIRONMENTALLY FRIENDLY
  • IS FIRE RESISTANT
  • IS TERMITE RESISTANT
  • ACHIEVES BAL 40 AS REQUIRED IN AS3959:2009 – CONSTRUCTION OF BUILDINGS IN BUSHFIRE PRONE AREAS.
  • QUICK AND SIMPLE TO INSTALL USING MANUAL NAILING, GUN NAILING OR SCREW FIXING.

PRODUCT DESCRIPTION

NuLine Weatherboards are a general-purpose fibre cement cladding for external applications.
They are manufactured as planks, which are reminiscent of traditional weatherboards both in
appearance and installation methods.

NuLine Weatherboards are not subject to timber rot, decay, or white ant damage and will not support combustion. The result is a safer, more durable cladding that requires minimum maintenance.

NuLine is available in a smooth finish. At 14 mm thick, NuLine has the strength to withstand the rig-ours of all normal family activities.

ADVANTAGES

  • Features a level joining system utilising a biscuit joiner
  • Quick and easy to cut, handle and install
  • Durable and low maintenance
  • Won’t rot or decay
  • Environmentally friendly

ENERGY EFFICIENCY CONSIDERATIONS

the Building Code of Australia (BCA) for both commercial and residential buildings. Thermal heat transfer into and out of the building envelope will effect the running cost of the building
and careful consideration of thermal heat transfer needs to be addressed by the architects, engineers and building designers.

Thermal bridging through steel framing will diminish the total R-Value; thermal conductance, of the wall. Thermal breaks are required for steel framed buildings and should be installed
between the Peer top hat sections and the Duracom cladding. Thermal break tapes should have a minimum R-Value of 0.2.

PRODUCT INFORMATION

NuLine Weatherboards are manufactured from Portland cement, finely ground silica, cellulose fibres and water. Planks are cured in a high-pressure steam autoclave to create a durable, dimensionally stable product.

NuLine Weatherboard fibre cement products are manufactured to conform to the requirements
of AS2908.2 Cellulose-Cement Products and are classified as Type A Category 3 for external use.

FIRE RESISTANCE

BGC Fibre Cement products have been tested in accordance to Australian Standard AS1530.3 – 1989.

These tests deemed the following Early Fire Hazard Indices:

  • Ignition Index                                  0
  • Spread of Flame Index                  0
  • Heat Evolved Index                        0
  • Smoke Developed Index                0-1

PANEL SIZES AND MASS

Nuline weatherboard panels are available in the following sizes.
THICKNESS
mm
MASS
KG/M2
WIDTH
mm
LENGTH
mm
14 4.13 175 Smooth 4200
4.83 205 Smooth 4200

Sizes available in Square and Bullnose profiles.

PLANK TOLERANCES

  • Width +0/-1 mm
  • Length +0/-2 mm
  • Thickness +10%/-0%
  • Diagonals difference (max) 2 mm
  • Edge straightness deviation (max) 1 mm

PROFILES

HEALTH AND SAFETY

BGC NuLine is manufactured from cellulose fibre, finely ground sand, Portland cement and additives. As manufactured, the product will not release airborne dust, but during drilling, cutting and sanding operations cellulose fibres, silica and calcium silicate dust may be released.

Breathing in fine silica dust is hazardous and prolonged exposure (usually over several years) may cause bronchitis, silicosis or cancer.

AVOID DUST INHALATION

When cutting planks, work in a well-ventilated area and use the methods recommended in this literature to minimise dust generation. If using power tools wear an approved (P1 or P2) dust mask and safety glasses.

These precautions are not necessary when stacking, unloading or handling fibre cement products.

QUANTITIES READY RECKONER

Table 1 is provided to assist in calculating the number of planks required to cover a given wall height.

For triangular areas such as Gable ends, halve the quantities derived for a rectangular wall then add 10% to cover off cuts.

Table 1 Plank Course Ready Reckoner
PLANK COURSES WALL HEIGHT
175 mm PLANK30 mm OVERLAP 205 mm PLANK30 mm OVERLAP
1 175 205
2 320 380
3 465 555
4 610 730
5 755 905
6 900 1080
7 1045 1255
8 1190 1430
9 1335 1605
10 1480 1780
11 1625 1955
12 1770 2130
13 1915 2305
14 2060 2480
15 2205 2655
16 2350 2830
17 2495 3005
18 2640 3180
19 2785 3355
20 2930 3530

CUTTING AND DRILLING

Nuline planks may be cut to size on site. If using power tools for cutting, drilling or sanding they must be fitted with appropriate dust collection devices or alternatively an approved (P1 or P2) dust mask and safety glasses shall be worn. It is recommended that work always be carried out in a well-ventilated location.

The most suitable cutting methods are:

DURABLADE

180mm Diameter. This unique cutting blade is ideal for cutting Fibre Cement. Can be fitted to a 185mm circular saw, ie Makita or similar. Please ensure safe working practices when using.

NOTCHING

Notches can be made by cutting the two sides of the notch. Score along the back edge then snap upwards to remove the notch.

DRILLING

Use normal high-speed masonry drill bits. Do not use the drill’s hammer function. For small round holes, the use of a hole-saw is recommended. For small rectangular or circular penetrations, drill a series of small holes around the perimeter of the cut out. Tap out the waste piece from the sheet face while supporting the underside of the opening to avoid damage. Clean rough edges with a rasp.

Large rectangular openings are formed by deeply scoring the perimeter of the opening. Next, form a hole in the centre of the opening (refer method above) then saw cut from the hole to the corners of the opening. Snap out the four triangular segments. Clean rough edges with a rasp. (see method above) then saw cut from the hole to the corners of the opening. Snap out the four triangular segments. Clean rough edges with a rasp.

HANDLING AND STORAGE

NuLine planks must be stacked flat, up off the ground and supported on equally spaced (max 300mm) level gluts.

Planks must be kept dry. When stored outdoors it must be protected from the weather. Care should be taken to avoid damage to the ends, edges and surfaces. Planks must be dry prior to fixing, jointing or finishing.
COASTAL AREAS

The durability of galvanised nails and screws used for external cladding in coastal or similar corrosive environments can be as low as 10 years.

For this reason BGC recommend the use of stainless steel fasteners within 1km of the coast or other large expanses of salt water.

ACCESSORIES AVAILABLE FROM BGC

INTERNAL ALUMINIUM CORNER 2700mm  
EXTERNAL ALUMINIUM CORNER 2700mm  
INTERNAL OBTUSE ANGLE 2700mm  
EXTERNAL OBTUSE ANGLE 2700mm  
J MOULD 2700mm  
STARTER STRIP 2700mm  
JOINERS Pack of 60  

FASTENERS

NuLine must be fastened at every stud (or batten for vertical installations).

Fasteners must not be placed closer than 12 mm from the plank edge.

NULINE TO TIMBER FRAME

No. 65 x 2.8mm galvanised flat head nails

/ For renovation projects where the original cladding is not removed, longer nails (70 x 2.8mm or longer) will be required.
/ Care is needed when using nail guns. If variability occurs the gun should be set to under drive and the nails tapped home with a hammer.

Nails must not be driven closer than 50 mm from the plank end.
Nails or fasteners can be located 20 mm minimum from the plank end if the fastener hole is predrilled. Except for straight joints, planks must be fixed a maximum of 100 mm from the
plank end.

NULINE TO STEEL FRAME

No. 8 x 40mm galvanised self embedding head screws

/ Screw fasteners should be located 35mm from the plank edge.

CONSTRUCTION DETAILS

FRAMING

In general, the layouts presented in this publication will be satisfactory for low-rise (up to two storey) domestic and light commercial buildings in non-cyclonic regions.

Buildings in cyclonic regions, high-rise buildings, large industrial and commercial complexes will generally require a specific design to be undertaken. The relevant design details pertaining to NuLine for various wind classifications, are presented in Figure 2.

NuLine is suitable for installation on either timber or lightweight steel framing.

Figure 2. WALL AND GABLE END CLADDING

TIMBER FRAMING

Timber framing must be dry prior to fixing NuLine. If planks are fixed to ‘wet’ framing, problems may occur at a later date due to excessive timber shrinkage.

It is strongly recommended that kiln dried framing is used.

LIGHT WEIGHT STEEL FRAMING

NuLine may be fixed directly to lightweight steel framing. The steel framing must not exceed 1.6 mm in thickness.

When rigid steel framing is used, it must be battened out with either timber or lightweight steel battens prior to fixing NuLine Weatherboards.

TIMBER BATTENS

Timber battens must have a minimum thickness of 40 mm to allow adequate nail penetration.

STEEL BATTENS

Steel battens are typically 50mm wide on the face x 35mm deep x 0.75mm thick.
FRAMING CENTRES

GENERAL

Figure 3 depicts the general framing requirements for NuLine installed horizontally.

SARKING

The installation of a vapour permeable sarking between NuLine and the framing is recommended. The building’s internal pressure will generally be less than the external air
pressure under windy conditions, which will tend to draw water through the planking, flashing and seals if sarking is not used.

Use of a reflective sarking will enhance the insulation properties of the cladding system (eg. Gladiator Perforated Wall Wrap or Sisalation 499) or equivalent.

FIGURE 3 HORIZONTAL FIXING

INSTALLATION

/ Calculate the number of NuLine Weatherboards required using the Plank Course Ready Reckoner as detailed in Table 1, on page 5.

/ Fix all flashings to wall openings and external and internal corners. See figures 8a and 8b for corner details using BGC aluminium angles.

/ Fix a starter strip (timber or a strip of plank) to the bottom plate to ensure the first row of NuLine Weatherboards are packed out to the correct angle. This starter strip is to be continuous around the perimeters of the building and to overhang the slab edge by 50mm. See figure 5 for this detail.

/ Set a horizontal datum line around the perimeter of the building using a string line or spirit level. Fix guide nails/screws along this line to act as a stop for the correct placement of the first course of NuLine Weatherboards.

/ NuLine is best suited to be joined off the studs using a factory cut biscuit. See figures 3 and 4 for these details.

/ Commence fixing the bottom course of plank from an external corner. Fasten the bottom edge of the plank to each stud through the starter strip. Ensure that the plank is level and flush with the corner. Do not nail home the corner fixing at this time.

/ Fit the plank joiner (biscuit) to the end of the plank and apply a bead of sealant then continue fixing the bottom course.

/ Install extruded aluminium corners, before nailing home the corner fixing. See figure 7 for this detail.

/ The plank must overlap a minimum of 30mm, and before fixing the second row of planks calculate the overlap so a near full width of plank will finish at the top of the building. Using a piece of timber or plank, fabricate a lap gauge to ensure that the plank coverage is uniform.

/ Fixings must not be driven closer than 50mm from the end of the plank. For fixings between 20mm – 50mm from the end, the plank must be predrilled with a 3mm hole.

FIGURE 4 PLANK JOINT USING BISCUIT

INSTALLATION

FIGURE 5 STARTER PLANK

FIGURE 6A FASTENER DETAIL TIMBER FRAMING

FIGURE 6B FASTENER DETAIL STEEL FRAMING

FIGURE 6C HALF HEIGHT TIMBER FRAME

FIGURE 7A EXTERNAL CORNER DETAIL

FIGURE 7B INTERNAL CORNER

PLANK OVERLAPS

Planks must overlap the previous course by a minimum of 30 mm. Higher overlaps may be used to improve weather proofing (particularly when sarking is not used) or to match the wall
height to the plank width. See Table on page 5.

CUTTING AROUND OPENINGS

When cutting planks around window or door openings, a 5 mm nominal clearance must be provided at the jamb, head and sill.

Plank courses should be set out so that as near to a full plank width as possible remains under a window, or similar openings. See Figure 9.

A plank joint at one end for small openings and both ends of longer openings will make installation easier and eliminate breakages.

Flashing and mouldings must be installed as appropriate to prevent ingress of water into the framing.

FIGURE 8 WINDOW AND DOOR OPENINGS

PAINTING

To enhance both the appearance and performance of NuLine, BGC recommend that at least two coats of a 100% acrylic exterior grade paint be applied. The paint manufacturer’s ecommendation on application and maintenance of the paint system should be followed.

Note: BGC recommend the use of a roller or brush application for best results.

MAINTENANCE

NuLine when used in accordance with this literature requires no direct maintenance.

To guard against water penetrating the structure and damaging the framework, annual inspections of the cladding system should be carried out. Check flashing, sealant joints and
paint work.

Flashing and sealants must continue to perform their design function.

Damaged planks should be replaced as originally installed.Paintwork should be maintained in accordance with the manufacturer’s instructions.

INSULATION

NuLine cladding will require insulation to be installed in some regions that have thermal loss regulations.

Insulation should be installed in accordance with the manufacturers instructions.

Insulation bats must fit snugly between framing members to minimise heat loss.

FREEZE THAW

NuLine subject to freeze / thaw conditions must be painted.

NuLine should not be used in situations where it will be in direct contact with snow or ice for prolonged periods.

THERMAL BRIDGING

Thermal breaks are required for steel framed buildings, In walls enclosing habitable and or useable spaces. Careful consideration of thermal heat transfer and the position of thermal breaks need to be addressed by the architects, engineers and building designers.

Balustrades, parapets, and other non-enclosing wall elements may not require thermal bridging, except where the possibility of high thermal heat transfer exists through the steel CFS
sections to the main structural steel element of the building.

Thermal breaks should be installed between the Nuline weatherboards and the steel framing.

For further information refer to section 3.12.1.4 of the BCA. Thermal bridging is to be no less that R 0.2

WARRANTY

BGC warrants its products to be free from defects caused by faulty manufacture or materials. If any of its products are so defective the Company will at its option, repair or replace them, supply equivalent replacement products or reimburse the purchase price.

This warranty shall not apply to any loss or consequential loss suffered through or resulting from defects caused by faulty manufacture or materials.

Fittings or accessories supplied by third parties is beyond the control of BGC and as such is not warranted by BGC.

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