K10 Plasterboard dry linings/ partitions/ ceilings (continued) K10
K10 PLASTERBOARD DRY LININGS/ PARTITIONS/ CEILINGS
To be read with Preliminaries/ General conditions.
TYPES OF DRY LINING
K10/110 METAL STUD PARTITION SYSTEM: (GYPROC SYSTEM REF A206067)
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Partition type: Gypwall’ Metal studs (48mm), 2 x board finish to each face generally,
1x board finish to corridor face to link.
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Partition height: to suit locations up to max 3400mm.
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Thickness; 100mm ‘
63mm to link corridor.
- Head condition: to suit locations and surrounding structure
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Head deflection allowance: to be confirmed by SE to suit partition location and
surrounding structure, min 25mm.
- Structural performance:
- Strength grade to BS 5234-2: Severe.
Max partition Ht; 3.40m
- Fire resistance of complete partition assembly to BS 476-20 and -22:
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Integrity/ insulation: 90 minutes.
30 minutes min to Corridor Link
- Metal framing: As recommended for the purpose by the board manufacturer,
Framing sections; to suit overall height of wall lining
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Linings: 2x12.5mm Fireline board, as clause K10/404, fixed to each face linings
amended to suit locations and environmental conditions.
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1x15mm Duraline board, as clause K10/401, fixed to one face,
to Corridor link.
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Finishing: Plaster skim, as clause 680
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
- Accessories: to suit locations
- Other requirements: fire stop around all services penetrations
K10/115 METAL STUD PARTITION SYSTEM: (GYPROC SYSTEM REF A233008/028)
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Partition type: ‘Gypwall’ Metal studs (70mm), inc’ board finish to each face,
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Partition height: to suit locations UP TO MAX 5000mm.
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Thickness; 208mm + skim finishes
- Head condition: to suit locations and surrounding structure
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Head deflection allowance: to be confirmed by SE to suit partition location and
surrounding structure min 25mm.
- Structural performance:
- Strength grade to BS 5234-2: Severe.
Max partition Ht; 5.0m
- Fire resistance of complete partition assembly to BS 476-20 and -22:
- Integrity/ insulation: 90 minutes.
- Metal framing: As recommended for the purpose by the board manufacturer,
Framing sections; to suit overall height of wall lining
- Linings: 2 layers of 12.5mm Soundblock board, as clause K10/402, fixed to each face. linings amended to suit locations and environmental conditions.
- Cavity insulation: 50mm Isowool APR 1200 to cavity, as clause 425, between studs.
- Finishing: Plaster skim, as clause 680
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
- Accessories: to suit locations
- Other requirements: fire stop around all services penetrations.
140 WALL LINING SYSTEM –DriLyner Basic System
- Manufacturer: Gyproc
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Product reference: ‘DriLyner Basic system with
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15mm Duraline plasterboard, as clause K10/401.
- Background wall: Existing brick/blockwork and concrete dependant on location.
Thickness; 25mm + skim finish
Fixing details; Gyproc Dri-Wall Adhesive applied in accordance with BS8212 and
BS 8000: Part8. To give min 20% area of contact between board and background.
- Finishing: Durafinish skim, as clause 680.
Primer/ sealer: Gyproc Drywall sealer prior to decoration.
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Other requirements: fire stop around all services penetrations, provide fire barriers as clause K10/530.
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K10/155 WALL LINING SYSTEM (METAL STUDS)
- Manufacturer: Gyproc.
- Product reference: GypLyner IWL system.
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Studs: 48mm studs for heights up to 2.7m
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92mm studs for heights up to 5.7m.
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Type: 48 I 50 studs
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92 I 90 studs.
- Centres: 600mm.
- Cavity width: 20mm.
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Unbraced height (maximum): 48mm studs for heights up to 2.7m
92mm studs for heights up to 5.7m..
- Head condition: to suit locations and surrounding structure.
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Head deflection allowance: to be confirmed by SE to suit partition location and
surrounding structure min 25mm..
- Cavity insulation: 50mm Isowool APR 1200 to cavity.
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Vapour control layer: To external wall situations Tyvek or similar, all
joints to be sealed with adhesive tape.
- Linings: 2 x layers 12.5mm Gyproc Fireline board as clause K10/404.
Profilex Access panels 550mm x 550mm.
- Finishing: Plaster skim, as clause 680.
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
- Accessories: to suite locations.
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Other requirements: fire stop around all services penetrations.
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K10/215 CEILING LINNING ON TIMBER
- Drawing references:7769-17, 7769-18 and 7769-20.
- Background: New and Existing Timber roof joists/SW Framing.
- Linings: 2x 12.5mm Fireline board, as clause K10/404.
- Finishing: Plaster skim, as clause 680.
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
- Other requirements: fire stop around all services penetrations.
K10/216 CEILING LINNING ON TIMBER
- Drawing references:7769-31, 7769-21.
- Background: New Timber roof joists/SW Framing and Plywood underdrawing.
- Linings: 12.5mm Fireline board, as clause K10/404.
- Finishing: Plaster skim, as clause 680.
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
- Other requirements: fire stop around all services penetrations.
K10/237 SUSPENDED CEILING SYSTEM (GYPROC MF SYSTEM)
- Manufacturer: British Gypsum.
Fire resistance; Min 1HR FR
- Structural soffits: Existing trapezoidal metal roof deck and steel lattice beams.
- Suspension system:
- Product reference: Gyproc Casoline MF system to include;
- Hangers, primary support channels, ceiling sections and perimeter channels to suit.
- Linings: 2 layers 12.5mm Fireline board, as clause K10/404 – all joints staggered.
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Access units: For access to M and E services to be 1 hour fire rated Blazedor/PF
600 x 600 as supplied by M & M Access Ltd, (tel 01604 644 944)
- Finishing: Skim finish as clause K10/680.
Accessories; fire stop around all services penetrations.
Provide ‘Envirograf’ Acoustic/Intumescent downlighter covers and
cages to all light fittings.
K10/240 BULKHEADS TO SUSPENDED CEILING SYSTEMS
- Drawing references: 7769/20, 7769/21
- Manufacturer: British Gypsum.
- Structural soffits: various existing concrete and steel downstands.
- Suspension system:
- Product reference: Gyproc Casoline MF system to include;
- Hangers, primary support channels, ceiling sections and perimeter channels to suit.
- Linings: Gyproc 12.5mm Soundbloc boards as clause K10/402, fixed to suspension system.
- Finishing: Skim finish as clause K10/680.
- Primer/ sealer: Gyproc Drywall sealer prior to decoration.
GENERAL/ PREPARATION
K10/325 PREPARATION OF SOLID BACKGROUNDS TO RECEIVE WALL LININGS
- General: Suitable to receive lining system. Redundant fixtures and services removed. Cutting, chasing and making good completed.
- Holes, gaps, service penetrations, perimeter junctions and around openings: Seal completely.
- Adhesive fixings: Prepare to achieve effective bonding.
- Contaminants: Remove loose material, dirt, grease, oil, paper, etc.
- Absorption: Control by dampening, priming or using bonding agents as necessary.
K10/335 ADDITIONAL SUPPORTS
- Framing: Accurately position and securely fix to fully support:
- Partition heads: Running parallel with, but offset from main structural supports.
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Fixtures, fittings and service outlets: To suit fixings. Mark framing positions clearly
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and accurately on linings.
- Board edges and lining perimeters: As recommended by board manufacturer to suit type and performance of board.
K10/375 NEW WET LAID BASES
- Dpcs: Install under partitions/ freestanding wall linings, cut to full width of partition/ lining.
COMPONENTS
K10/401 GYPSUM DURALINE PLASTERBOARD
- Exposed surface and edge profiles: Suitable to receive specified finish.
K10/402 GYPSUM PLASTERBOARD (IMPROVED SOUND INSULATION)
- Type: To BS 1230-1, type 1, Gyproc ‘Soundbloc’, or similar, 12.5mm.
- Core density (minimum): 820 kg/m³.
- Exposed surface and edge profiles: Suitable to receive specified finish.
K10/404 GYPSUM PLASTERBOARD (IMPROVED FIRE PROTECTION)
- Type: To BS 1230-1, type 5, Gyproc ‘Fireline’ or similar, 12.5mm.
- Core density (minimum): 800 kg/m³.
- Core: Including fibres for improved cohesion.
- Exposed surface and edge profiles: Suitable to receive specified finish.
K10/425 ACOUSTIC INSULATION
- Type: Isowool Acoustic Partition roll (1200).
- Thickness: 50 - 100mm, to suit locations.
K10/430 ACCESS UNITS - WALLS
- Manufacturer and reference; Gyproc ‘Profilex FR1 Standard Panels.
Flush metal faced, polyester powder coated finish to match wall finish.
Size; 550 * 550mm.
440 ACCESS UNITS - CEILINGS
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Manufacturer and reference; For access to M and E services to be 1 hour fire rated Blazedor/PF 600 x 600 as supplied by M & M Access Ltd,
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(tel 01604 644 944).
INSTALLATION
K10/435 DRY LININGS GENERALLY
- General: Use fixing, jointing and finishing materials, components and installation methods recommended by board manufacturer.
- Cutting plasterboards: Neatly and accurately without damaging core or tearing paper facing.
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Cut edges: Minimize and position at internal angles wherever possible. Mask with
bound edges of adjacent boards at external corners.
- Fixings plasterboards: Securely and firmly to suitably prepared and accurately levelled backgrounds.
- Finishing: Neatly to give flush, smooth, flat surfaces free from bowing and abrupt changes of level.
K10/445 CEILINGS
- Sequence: Fix boards to ceilings before dry lined walls and partitions.
- Orientation of boards: Fix with bound edges at right angles to supports and with ends staggered in adjacent rows.
- Two layer boarding: Stagger joints between layers.
K10/455 METAL FRAMING FOR PARTITIONS
- Setting out: Accurately aligned and plumb.
- Stud positions: Equal centres to suit specified linings, maintaining sequence across openings.
- Additional studs: To support vertical edges of boards.
- Fixing centres at perimeters (maximum): 600 mm.
- Openings: Form accurately, including:
- Doorsets: Sleeved/ boxed metal studs and/ or suitable timber framing to achieve strength grade requirements for framing assembly and adequately support weight of door.
- Services penetrations: Allow for associated fire stopping.
K10/465 STAGGERED STUD PARTITIONS
- Fixing horizontal frame members (noggins, bearers, etc.) and boards: Between alternate studs and not touching adjacent offset studs.
K10/505 INSTALLING ACOUSTIC INSULATION
- Fitting: Accurately and firmly with closely butted joints and no gaps.
- Widths: Lay insulation in the widest practical widths to suit grid member spacings.
- Services: Do not cover electrical cables that are not sized accordingly.
- Ceilings: Cut insulation carefully around electrical fittings, etc. Do not lay over luminaires.
- Fixing:
- Partitions/ wall linings: Fasten insulation at head of frame to prevent displacement, unless insulation is self supporting and friction fitted between studs.
- Ceilings (vertical/ sloping areas): Fasten insulation to prevent displacement.
K10/510 SEALING GAPS AND AIR PATHS
- Application of sealant to dry lining systems: Continuous beads leaving no gaps or air paths.
- Acoustic sealant: Apply to perimeter abutments with walls, floors, ceilings and around openings.
- Gaps greater than 6 mm wide: After application of sealant, complete sealing with jointing compound.
- Air pressure sealant: Apply to board to board and board to metal frame junctions in pressurised shafts, ducts, etc.
K10/530 CAVITY FIRE BARRIERS WITHIN PARTITIONS/ WALL LININGS
- Metal framed systems:
- Material: Mineral wool.
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Installation: Form accurately and fix securely with no gaps to provide a complete
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barrier to smoke and flame.
- Adhesive fixed wall lining systems:
- Material: Adhesive compound.
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Installation: Form in a continuous line with no gaps to provide a complete barrier to
smoke and flame.
545 K10/ CAVITY FIRE BARRIERS WITHIN SUSPENDED CEILINGS.
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Type : Rockwool Fire Barrier
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Fire resistance: 60/60
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Ceiling void subdivision: Fire barriers to be not more than 20m apart in any direction.
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Fixing at perimeters and joints: Secure, stable and continuous with no gaps, to
provide a complete barrier to smoke and flame.
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Service penetrations: Cut and pack to maintain barrier integrity. Sleeve flexible
materials. Adequately support services passing through
barrier.
ceiling system.
K10/555 FIRE STOPPING AT PERIMETERS OF DRY LINING SYSTEMS
- Material: Tightly packed mineral wool or intumescent mastic/ sealant.
- Application: To perimeter abutments to provide a complete barrier to smoke and flame.
K10/560 JOINTS BETWEEN BOARDS
- Tapered edged plasterboards:
- Bound edges: Lightly butted.
- Cut/ unbound edges: 3 mm gap.
- Square edged plasterboards: 3 mm gap.
- Square edged fibre reinforced gypsum boards: 5 mm gap.
K10/565 VERTICAL JOINTS
- Centre joints on studs.
- Partitions: Stagger joints on opposite sides of studs.
- Two layer boarding: Stagger joints between layers.
K10/570 HORIZONTAL JOINTS
- Surfaces exposed to view: Horizontal joints not permitted.
- Exception: Where height of partition/ lining exceeds maximum available length of board. Agree positions of joints.
- Two layer boarding: Stagger joints between layers by at least 600 mm.
- Provide support to edges of boards with additional framing.
- Two layer boarding: Support edges of outer layer.
K10/590 FIXING PLASTERBOARD TO METAL FRAMING/ FURRINGS
- Fixing to framing/ furrings: Securely and firmly working from the centre of each board at the following centres (maximum):
- Partitions/ wall linings: 300 mm. Reduce to 200 mm at external angles.
- Ceilings: 230 mm. Reduce to 150 mm at board ends and at lining perimeters.
- Position of screws from edges of boards (minimum): 10 mm.
- Screw heads: Set in a depression. Do not break paper or gypsum core.
K10/595 DEFLECTION HEADS
- Fixing boards: Do not fix to head channels.
K10/610 FIXING PLASTERBOARD TO TIMBER
- Fixing to timber: Securely and firmly working from the centre of each board at the following centres (maximum):
- Nail fixing: 150 mm.
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Screw fixing to partitions/ wall linings: 300 mm. Reduce to 200 mm at external
angles.
- Screw fixing to ceilings: 230 mm.
- Position of nails/ screws from edges of boards (minimum):
- Bound edges: 10 mm.
- Cut/ unbound edges: 13 mm.
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Position of nails/ screws from edges of timber supports (minimum): 6 mm.
K10/620 FIXING PLASTERBOARD WITH ADHESIVE DABS
- Setting out boards: Accurately aligned and plumb.
- Fixing to substrates: Securely using adhesive dabs.
- Adhesive dab spacings for each board:
- Horizontally: One row along top edge and one continuous dab along bottom edge.
- Vertically: One row along each edge and thereafter at intermediate spacings to suit size of board:
Thickness (mm) Width (mm) Dab centres (mm)
9.5 1200 400
9.5/12.5 900 450
12.5 1200 600
- Adhesive dab dimensions (width x length): At least 50–75 mm x 250 mm.
- Position of dabs from edges/ ends of boards (minimum): 25 mm.
FINISHING
K10/650 LEVEL OF DRY LINING ACROSS JOINTS
- Sudden irregularities: Not permitted.
- Joint deviations: Measure from faces of adjacent boards using methods and straightedges (450 mm long with feet/ pads) to BS 8212, clause 3.3.5.
- Tapered edge joints:
Permissible deviation (maximum) across joints when measured with feet resting on boards: 3 mm.
- External angles:
Permissible deviation (maximum) for both faces: 4 mm.
- Internal angles:
Permissible deviation (maximum) for both faces: 5 mm.
K10/670 SEAMLESS JOINTING TO PLASTERBOARDS
- Cut edges of boards: Lightly sand to remove paper burrs.
- Filling and taping: Fill joints, gaps and internal angles with jointing compound and cover with continuous lengths of paper tape, fully bedded.
- Protection of edges/ corners: Reinforce external angles, stop ends, etc. with specified edge/ angle bead.
- Finishing: Apply jointing compound. Feather out each application beyond previous application to give a flush, smooth, seamless surface.
- Nail/ screw depressions: Fill with jointing compound to give a flush surface.
- Minor imperfections: Lightly sand jointing and spotting to remove any minor imperfections.
K10/680 SKIM COAT PLASTER FINISH
Type: Thistle Multi Finish generally.
Thistle Durafinish to Duraline plasterboard.
Thickness: 3 mm.
- Joints: Fill and tape except where coincident with metal beads.
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Finishing: Trowel/ float to a tight, matt, smooth surface with no hollows, abrupt changes of level or trowel marks.
K10/692 RIGID BEADS/ STOPS
- Type: Galvanized steel to BS 6452-1.
K10/695 INSTALLING BEADS/ STOPS
- Cutting: Neatly using mitres at return angles.
- Fixing: Securely using longest possible lengths, plumb, square and true to line and level, ensuring full contact of wings with background.
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Finishing: After joint compounds/ plasters have been applied, remove surplus material while still wet from surfaces of beads which are exposed to view.
K10/725 REPAIRS TO EXISTING PLASTERBOARD
- Filling small areas with broken cores: Cut away paper facing, remove loose core material and fill with jointing compound.
- Finish: Flush, smooth surface suitable for redecoration.
- Large patch repairs: Cut out damaged area and form neat hole with rectangular sides. Replace with matching plasterboard.
- Fixing: Use methods to suit type of dry lining, ensuring full support to all edges of existing and new plasterboard.
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Finishing: Fill joints, tape and apply jointing compound to give a flush, smooth
surface suitable for redecoration. |