6.5mm SQUARE EDGE RHINOBOARD by Gyproc
- Subject to loading detail, suspension should not exceed 1200mm centres
- The suspension must not be out of plumb (vertical) more than 25mm for each 150mm of plenum depth and in no case should exceed 500mm to a 3000mm depth
- Whenever the above is exceeded and/or when the hanger suspension is more than 2000mm long, then a sub grid is recommended. Should suspension be vertical, then a 4200mm drop would be acceptable using hanger strap
- In no case should suspension be from other services in the ceiling void
- A hanger suspension point within 400mm from the wall angle or shadow moulding must be installed on main tees and cross tees
- Two steel pop rivets with a shear strength three times that of the maximum allowed ceiling load is to be used
- When securing wire to tee, it should be wound tightly around itself at least three times
- Should the ceiling mass exceed 20kg/m2, a sub grid is required and a consulting engineer should recommend suitable suspension
Gyproc RhinoBoard is manufactured according to the ISO 9001 Quality Management System and the ISO 14001 Environmental Management System. RhinoBoard is a plasterboard and consists of an aerated or foamed gypsum core encased in, and firmly bonded to, special paper liners.
RhinoBoard is used as lining/cladding for ceilings, drywalls. RhinoBoard is non combustible and it is used as a lining in fire rated drywall and ceiling systems.
The face (unprinted) surface should receive all decoration (i.e. gypsum based plaster, paint, vinyl, etc.). Do not decorate the printed surface.
Do not expose standard RhinoBoard to contact with water. It is not recommended for use in industrial kitchens and industrial bathrooms or exterior applications.
Type of Board
Gyproc RhinoBoard – This is a standard grade board with no special additives in the gypsum core, but with specially treated paper liners.
Mass Per m² of 6.4mm Gyproc RhinoBoard: CTN: 5.5kg/m2 and BPN: 5.7kg/m2
Gypsum plasters and plasterboard provide good fire protection in buildings due to the unique behaviour of their gypsum content when exposed to fire. Pure gypsum (CaSO42H20) contains nearly 21% chemically bonded water in crystallised form and about 79% calcium sulphate (CaSO4) which is inert below a temperature of 1 3000C. When gypsum protected elements of a structure are exposed to fire, the chemically combined water is gradually released in the form of moisture vapour. If a sufficiently high temperature is maintained, eventually all of the crystallised water will be expelled.
The process of dehydrating gypsum by exposure to heat, known as “calcination”, commences at the surface exposed to the fire and proceeds gradually through the gypsum layer (i.e. the thickness of the gypsum plaster covering or the core of the plasterboard). The covering of calcinated gypsum formed on the exposed face adheres tenaciously to the uncalcinated material and serves to retard the process, which becomes progressively slower as the thickness of calcinated gypsum increases.
While this process continues, the temperature directly behind the plane of calcination is only slightly higher than that of boiling water (1000°C) and therefore, until all the crystallised water has been liberated, the temperature of materials adjacent to, or in contact with, the unexposed side cannot exceed 1000C. This temperature is well below that at which materials stored in buildings will ignite. Once the gypsum layer is completely calcinated, the residue (calcium sulphate) continues to act as an insulating barrier for as long as it remains intact.
RhinoBoard is listed as a non-combustible material in the National Building Regulations SANS 10400, part T.
Thermal conductivity (k) is the measure of a material’s ability to transmit heat, and is expressed as heat flow in watts per square metre
of surface area for a temperature difference of 10C per metre thickness and is expressed as W/m0k. Generally, denser materials have high thermal conductivity and are inefficient thermal insulants. Lightweight materials have low conductivity and are efficient thermal insulants. The lower the (k) value of the material, the better is its insulation efficiency. RhinoBoard has a (k) value of 0.21W/m0k.
The thermal resistance (R) of a material is obtained by the following calculation where: t = the thickness of the material in metres.
RhinoBoard 6.4mm R value = 0.030m² K/W
RhinoBoard 9.5mm R value = 0.045m² K/W
The Sound Reduction Index quoted on the individual system data sheets are those of actual tests performed by the SABS over a range of frequencies and are based on an imperforate solid RhinoBoard. Copies of test certificates are available if required. Site installation will differ from stated figures due to air leakage paths between junctions with ceiling, floor and other walls, optimum performance requires that these junctions be sealed with suitable acoustic sealants.
Effects of temperature
The boards are not suitable for use in temperatures above 49oC, but can be subjected to freezing temperatures without risk of damage. When subjected to tests in accordance with SABS 266 : 1982, the Gyproc MoistureResistant absorbed less than 5% of water by weight in the total immersion test.
Thermal properties K = 0.25 W/m oC R = 0.05m² K/W
Gyproc MoistureResistant will give similar performance to a standard board when tested for fire rating or sound insulation.
The Gyproc RhinoBoard range is manufactured according to SABS 266 – 1982. The SABS specification incorporates ISO6308-1980 gypsum plasterboard specification with modifications
Gyproc RhinoBoard storage
RhinoBoard should be stacked on a level surface in a dry place, preferably inside a building and properly protected from damp and inclement weather. If boards are to be stacked on a concrete floor inside a building, a damp proof membrane should first be laid down, or a timber platform should be provided.
The wooden platform provided can be in the form of ‘Bangalalas’. The Bangalalas should be spaced at intervals of 400mm across the width of the boards, to prevent sagging of the boards.
The ends and edges of the boards should be neatly aligned. Boards stored outside should be stacked on a level platform of timber bearers as described above, away from the ground. The stack should then be completely covered with a securely anchored polythene sheet or tarpaulin.
Gyproc RhinoBoard handling
When RhinoBoard is manually off-loaded or stacked it should be carried, two men to a pair of boards. Boards should not be carried with the surfaces horizontal, since this imposes an undesirable strain on the core. When a board is stacked or removed from a stack, the long edge should be placed down before it is turned horizontal.
Boards should not be slid over each other as this can scuff the surface. RhinoBoard is particularly suited to mechanical handling, but this should be done with care. Forklifts should be equipped with multi pronged forks to handle boards exceeding 3000mm in length.
Gyproc RhinoBoard cutting
The following methods should be used when cutting RhinoBoard:
1. Place the board flat on a level surface, with the writing facing upwards.
2. Mark the cut on the face side of the board, using a chalkline of pencil.
3. Cut along this line with a utility knife.
4. Lift the board on its side and snap it back along the cut.
5. Cut the paper on the back of the board with the utility knife.