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WALLS | GYPROC DRYWALL GUIDELINES
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WALLS | GYPROC DRYWALL GUIDELINES
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PREPARATION
ADDITIONAL SUPPORT TO GYPROC DRYWALL TOP TRACK
Provisions to be made for top track to be fixed accurately to a securely fixed framing member. Top track to be
fixed at 600mm centres.
ADDITIONAL SUPPORT FOR FIXTURES AND FITTINGS
Provide or ensure provision of accurately positioned and securely fixed noggins to support fixtures, fittings and
services.
SERVICE PENETRATION
Penetrations for services should be given careful consideration to ensure that the fire, thermal and sound
performance of the wall is not compromised and also that services themselves do not act as pathways for the
transmission of fire, thermal and sound.
GENERAL
GYPROC STANDARDS/DESIGN CRITERIA
The drywall should be built in accordance with Saint-Gobain Gyproc specifications. The specifications should
be read in conjunction with the project specifications. The erection of the drywall should comply with SABISA
guidelines for dry walls. Performance is only guaranteed in conjunction with specified Isover insulation products.
QUALITY
The installer should have experience and knowledge of the installation of drywall systems or be a SABISA
approved installer.
RECOMMENDED QUALITY CONTROL ON SITE
Donn UltraSTEEL™ metal framing should be inspected by a recognised site authority.
All cavity services ducts and conduits should be installed before boarding. Plan the position of all service
penetrations/fittings and provide the necessary framing.
Gyproc RhinoBoard should be inspected after each installation and before finishing.
Manufacturer’s specification should be properly interpreted and adhered to. It is the drywall contractor’s
responsibility to ensure that the specifications are properly adhered to.
INSPECTION PRIOR TO INSTALLATION
Verify that site conditions are suitable for the commencement of work and that all labelled materials are as
indicated in the Saint-Gobain Gyproc specification document or as instructed by the manufacturer.
Ensure that there are no damaged materials. The building should be weather proof before the installation of
the Gyproc drywall lining.
GOOD PRACTICE DETAILING
ACOUSTICS
Consider the layout and structure of buildings at the design stage in order to separate quiet and noisy areas.
Plan properly to avoid retro-fitting of services and/or noggins.
Control sound paths around walls and floors to reduce flanking sound transmission. Seal the base and top
of the wall using non-hardening silicone sealant. It is general practice to install Gyproc sound seal before
fixing the bottom/top tracks and abutting studs. Tape and fill, or skim plaster plasterboard joints to increase
air tightness. Keep penetrations to a minimum and as small as possible. Use an acoustic sealant for optimum
sound insulation. Seal joints, junctions, penetrations, etc. to avoid transmission of sound through leakage.
It is good practice to seal all service holes/penetrations. Air conditioning ducts should be fitted with the
appropriate proprietary dampers.
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Avoid back-to-back sockets. Gaps on either side of the socket box should be sealed with an appropriate fire
or acoustic sealant. The gap between the socket box and opposite side lining should be filled. Closely follow
manufacturers’ fixing details as deviations may negate any acoustic benefit. Insulation deflection heads, by
definition, must be able to move and therefore achieving an airtight seal is very difficult without incorporating
sophisticated components and techniques. Air leakage at the drywall heads will have a detrimental effect on
the acoustic performance of any drywall.
Where the party wall meets the external wall/Gyproc drywall lining, appropriate detailing should be adopted
to reduce leakage of sound and vibration transfer.
FIRE RESISTANCE
Closely follow Saint-Gobain Gyproc specifications as deviations may negate fire resistance performance.
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Cut boards to a neat fit, avoiding any gaps.
If small gaps do occur, they must be backed by a framing member and filled with appropriate jointing
material, or be skim plastered.
Tape and fill joints, or skim plaster plasterboard to achieve fire performance.
Fire-stop joints, junctions, penetrations, etc. to maintain integrity.
Keep penetrations to a minimum.
Avoid back-to-back sockets.
THERMAL PERFORMANCE
• Seal lining perimeters and penetrations, etc. to avoid air leakage.
• Cut boards to a neat fit, avoiding any gaps.
• Keep penetrations to a minimum.
• Use Isover specified insulation in the cavity to improve the thermal performance of the wall.
• Avoid back-to-back sockets.
• Ensure there is no thermal bridging.
DOOR DETAIL
Where heavy semi-solid and solid core doors are fixed onto aluminium door frames, additional bracing and
reinforcement of the frame will be required, otherwise the door opening will undergo too much deflection and
damage if the door slams.
To reinforce Donn UltraSTEEL™ Studs use timber inserts. Load bearing studs can be used in place of the Donn
UltraSTEEL™ Studs - no reinforcing is required.
MAXIMUM DRYWALL HEIGHTS
Saint-Gobain Gyproc has adopted an internationally accepted methodology to determine maximum allowable
wall heights, which is based on the level of lateral deflection under a given uniformly distributed load (UDL).
The criterion is that the maximum lateral deflection of the drywall should not exceed L/240 (where L is the
drywall height) when the drywall is uniformly loaded to 200Pa.
SERVICES INSTALLATION
Services can be incorporated in all Saint-Gobain Gyproc drywalls and ceilings.
Donn UltraSTEEL™ Studs can be specified with service holes or service holes have to be made on site to
accommodate routing of electrical services.
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When forming service holes on site, these need to be cut in-situ, paying attention to Health and Safety issues.
Grommets or isolating strip must be installed in the service holes to prevent abrasion of the cables.
Switch boxes and socket outlets can be supported on brackets formed from Donn UltraSTEEL™ Track 102mm x 25mm. Pipes or conduits should be fixed in position before lining work commences.
To maintain an airtight construction, the perimeter of any penetration through the lining should be sealed as necessary at the time the services are being installed.
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• Where heating pipes, particularly micro-bore systems, are to be located within the Gyproc drywalling system, it is recommended that only one pipe is passed through each aperture in the metal framework.
If this cannot be accommodated for whatever reason, it may be necessary to incorporate proprietary pipe
restraining clips, or other means of keeping the pipes apart, to prevent vibration noise.
• Where a large number of electrical cables or pipes have to be accommodated when the framing is at 600mm centres, a service duct can be created by narrowing the stud centres to 300mm and boxing
the opening.
• Fixing electrical socket boxes into Gyproc drywalling systems can impair both fire and acoustic performance, but with careful detailing this can be minimised. In particular, back-to-back services must be avoided.
• The Gyproc RhinoBoard should always be neatly cut and a proprietary sealant should be applied where
optimum acoustic performance is required.
• The fire resistant properties of the drywall are indicated by it’s fire rating. A proprietary fire resistant
sealant should be used.
• For high acoustic performance, an acoustic expert should be consulted.
• Access to services can be achieved by installing access panels. The access panels should be designed not to compromise the sound, thermal and fire rating of the drywall system.
• By designing service zones through which all services pass, the number of individual service penetrations can be minimised.
• Services and fittings can be fixed to the face of Gyproc drywalling systems, using plywood/fixing strap
noggins within the cavity of the drywall. A minimum stud spacing of 400mm is recommended. An
alternative to this would be to install a metal or timber support framework within the cavity of the drywall.
DAMPERS
• Fire and smoke resistant dampers may be installed in Saint-Gobain Gyproc’s range of drywall systems.
Because the performance of the complete assembly will depend on a number of elements, the precise
details of the opening need to be determined in consultation with the damper manufacturers.
• Penetrations for dampers need careful scrutiny to ensure that the integrity of the element is not impaired, and also to ensure that the dampers do not act as a mechanism for the spread of fire. It is important to use only those dampers and installation methods which have been rigorously fire tested and proven to be able to maintain the integrity of the construction.
• Service zones may be sealed after installation of the services using a tested and certified fire stopping system.
• In most situations, the services will be installed by drywall contractors. It is therefore important that all relevant contractors should be instructed as to where and how their service penetrations should be made and maintained.
• The necessity for independent structural support to dampers will depend on their size and weight. Consult
Saint-Gobain Gyproc Technical and Specification on 0860 27 28 29 for further detailed information.
ACCESS TO SERVICES
Access panels should be designed to offer practical, cost effective solutions. Care should be taken that the
acoustic, thermal and fire performance of the wall is not compromised by the access panels.
HEALTH AND SAFETY
The details and guidance contained in this document have been written for the benefit of experienced trade
professionals, to assist them in the use and installation of Saint-Gobain Gyproc’s products.
This document assumes a level of expertise which makes it unsuitable for use by a novice without the benefit
of other guidance and instruction as to the use and installation of Saint-Gobain Gyproc’s products.
Saint-Gobain Gyproc provides training on the use and installation of all its products at the company’s Academy
Training Centres.
The advice and guidance referred to does not seek to replace Health and Safety regulations, or the inhouse systems of employers in relation to the use and installation of the Company’s products, but should
be considered supplementary to these. All users of such products and installation techniques should at all
times ensure that they are familiar with, and adhere to, their employer’s own Health and Safety procedures.
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While the advice and guidance given in the Specification Document meets relevant legislative and regulatory
requirements and standards current at the date of publication, it is the responsibility of the user to ensure
that these remain current prior to use.
The Saint-Gobain Gyproc products and systems included in the Specification Document have been developed
for use in domestic, commercial and industrial buildings.
Guidance as to the correct application and installation of these products and systems is included in the
installation sections.
It is important to follow good site practice at all times and to ensure that appropriate safety precautions are
taken (including the wearing of appropriate personal protection equipment and clothing) when working with
Saint-Gobain Gyproc products.
The following general notes are offered for guidance:
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Saint-Gobain Gyproc systems are non-load bearing and are not designed to support body weight.
Installers must work off an independently supported platform.
Manual off-loading of boards, panels and bagged materials should be carried out with care to avoid
unnecessary strain.
Keep sanding and other dust generation to a minimum. Maintain adequate ventilation and/or wear
suitable protection.
When cutting boards or metal sections, hand and power tools should be used with care, keeping hands clear of blades and saw teeth, etc.
Power tools should be used in accordance with manufacturers’ recommendations, and only be used by
people who have been instructed and trained to use them safely and correctly.
When using plaster, mix with water in well ventilated conditions. Avoid contact with eyes and skin – wear suitable eye and skin protection. In the event of contact with the eyes, irrigate with plenty of clean water immediately (MSDS is available upon request).
When handling insulation or cutting board products containing glass fibre, wear suitable skin protection. Wear eye protection when working overhead (MSDS is available upon request from
Saint-Gobain Gyproc Technical and Specifications).
Customers are also reminded that all the guidelines of the Occupational Health and Safety Act: 1993 should be adhered to.
When handling metal sections, gloves should be worn.
DONN ULTRASTEELTM METAL STUD FRAMING
• Use components, accessories and methods recommended by Saint-Gobain Gyproc.
• Set out floor/head tracks and perimeter studs to give a framework which is accurately aligned with a true vertical plane. Fix securely at all perimeters at not more than 600mm centres.
• Position studs at equal centres to suit specified linings, maintaining sequence across openings. Provide
additional studs as necessary to ensure support to all vertical edges of boards.
• Accurately form openings to receive door sets using Donn UltraSTEEL™ Studs. Load bearing studs and suitable timber insert should be used to achieve the strength requirements of the framing assembly and adequately support the weight of the door.
INSULATION
• Fit Isover Cavitybatt/U Thermo Boards securely with closely butted joints, leaving no gaps.
Unless the insulation is of a self supporting batt type fitted between studs, fix at head of frame using
Donn Galvanised Steel Angle 25mm x 25mm.
ACOUSTICS
• Saint-Gobain Gyproc reference: SoundSeal/Silicone Sealant.
• Install junctions between drywall(s) and adjoining structure.
• Apply as a continuous band to clean, dry, dust-free surfaces, leaving no gaps.
• Seal any gaps and service penetrations.
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FIRE STOPPING
• Seal any gaps and service penetrations, etc. using tightly packed Isover comfort ULTIMATE U Thermo Boards insulation or fire resisting/intumescent sealant, to prevent penetration of flame.
VERTICAL JOINTS
• Lightly butt boards together.
• Centre joints on studs. Ensure that joints on opposite sides of studs are staggered. For double layer
boarding, stagger joints between layers.
HORIZONTAL JOINTS
• RhinoBoards: Lightly butt boards together.
• Horizontal joints are not recomended in walls up to a height of 3600mm
• Horizontal joints may impinge on the aesthetics of a jointed wall. Consequently the position of horizontal
joints should be agreed upon with the Architect or Designer.
• For two layer lining, stagger joints between layers by at least 600mm. Provide horizontal framing
to support the horizontal edges of the first layer lining.
FIXING LINING TO DONN ULTRASTEELTM METAL SUPPORTS
• Single layer drywall face layer: Fix securely to all supports at maximum 220mm centres using
Gyproc RhinoBoard Sharp Point Screws 3.5mm diameter x 25mm.
• Double layer drywall first layer: Fix securely to all supports at maximum 220mm centres using
Gyproc RhinoBoard Sharp Point Screws 3.5mm diameter x 25mm.
• Double layer drywall face layer: Fix securely to all supports at maximum 220mm centres using
Gyproc RhinoBoard Sharp Point screws 3.5mm diameter x 42mm.
• Stagger the boards along Gyproc RhinoBoard butt joints. Fix working from the centre of each board.
Position screws not less than 13mm from cut edges and 10mm from bound edges of boards. Set heads in
a depression; do not break paper or gypsum core.
DEFLECTION HEADS
• To be specified by the project structural engineer when necessary.
JOINTED FINISH TO PLASTERBOARD
• Joint compound: Gyproc RhinoGlide
• Joints/gaps/internal corners: Gyproc RhinoTape.
• External corners: Donn Corner Bead.
• Primer/sealer: As per paint manufacturer’s recommendations.
• Lightly sand cut edges of boards to remove paper burrs. Cover all joints, gaps and internal angles
with Gyproc RhinoTape. Cover with Gyproc RhinoGlide feathered out to give a flush, smooth finish.
Sand if required.
• Reinforce external angles, stop ends, etc. with the Donn Corner Bead embedded in Gyproc RhinoGlide.
• Spot nail/screw depressions with joint compound to give a flush surface.
•After joint, angle and spotting treatments have dried, lightly sand to remove any minor imperfections.
PLASTER FINISH
• Thickness: 3mm to 6mm.
• Reinforcement: Joints/gaps/internal corners: Gyproc RhinoTape.
• External corners: Donn Corner Bead embedded in skim coat plaster.
• Fill and tape all joints.
•Trowel/float to a tight, matt, smooth surface with no hollows, abrupt changes of level or trowel marks
as per skim coat plaster specification.
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PAINTING: PLASTER FINISH/JOINTED FINISH
• Primer: as per paint manufacturer’s specifications.
• Apply paint as per project specification.
• Apply wallpaper as per manufacturer’s specifications.
• Do not apply epoxy paints.
WALLPAPER: PLASTER FINISH/JOINTED FINISH
• Primer: as per paint manufacturer’s specifications.
•Apply wallpaper as per manufacturer’s specifications.
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