Specification of “WINHOP SERIES®

GRG, Plasterglass or Glass Reinforced Plaster Dmcor Ceiling Products



Material for ceiling shall be ‘WINHOP SERIES®’ GRG, Glass Reinforced Fiberglass Gypsum, plasterglass or Glass Reinforced Plaster supplied by WINHOP LIMITED.


Product shall be manufactured to 4mm to 12mm thickness by hand laminated fibreglass reinforced gypsum, combined with strand of glassfibre and shall have density of not exceeding 1,500 kg/m3.


Fire Propagation Test – the material shall be tested in accordance with British Standard 476, Part 4, 1970 with the classification is Non-combustible.


Product (Moisture Resistance Type: MR) is recommended for area where high resistant to moisture is a prerequisite.




The specialist ceiling contractor shall be responsible for providing design proposal and shop drawing for the ceiling and its supporting system and shop drawings for the approval of Architects prior installation.


Mock Up


Samples must be submitted for Architects approval.  Site mock up is needed to check fixing condition, situation and finishing.


ISO 1400 (2001)


Manufacturer must achieve ISO 1400 (2001) standard or higher.


Factory Location


Factory locations in Guangzhou where delivery the products to local and overseas are convenience.  (Example: delivery time to H.K. or Macau is within 2 days)


Product Size


Product is no size limit, however, according the site situation, normally we recommend product size is not larger than 5m2 or 65kg.









A)    Clouts and Nails


For the fixing of ‘WINHOP SERIES®’ product all clouts and nails shall be galvanized.  The length of the clout or nail shall be sufficient to allow approximately 19mm penetration into solid wood or approximately 38mm where plugs are used.


B)    Screws


For the fixing of ‘WINHOP SERIES®’ product, screws shall be rust proof and a self drilling and tapping variety, a minimum of 25mm in length.


C)    Grouting


Used for grouting, shall be specially manufactured ‘BORAL’ or equivalent cornice adhesive plaster compound developed and approval for such purposes by the manufacturer.  Bonding strength should be maximum 300 mm in according to the standard CI-QA-TM-43.


D)    Water


Used in the mixing of plaster gauge and/or wetting down of dry plaster surfaces, shall be clean and fresh.


E)    Labour


The labour employed in the erection, fixing and finishing of ‘WINHOP SERIES® product shall be competent tradesmen.


F)     Fixing Surfaces


All nogging, trimming, straightening and packing of studs and ceiling joints necessary for the application of ‘WINHOP SERIES®’ product, shall be provided by the subcontractor prior to fixing operations.


Ceiling framing shall provide backgrounds for continuous fixing.


G)    Metal Framing


‘WINHOP SERIES®’ product shall be fixed to galvanized metal channel studs and ceiling furring channels in accordance with methods proposed by the specialist contractor and with approval of the Architect.


H)    Stopping


Clout and screws holes, joint angles, damaged arises, and other places required to be stopped, shall be finished in a tradesman like manner using ‘BORAL’ cornice adhesive stopping compound developed and approved by the manufacturer.




I)     Skim Plastering


To obtain satisfactory results with smooth finishes, filling & sanding will be required.  Surface of plasterglass should be skim plastered to at least 3mm(thk) before the application of surface finishing.


J)          Surface Finishing


Plasterglass shall only be painted under final lighting conditions to eliminate any imperfections apparent during temporary lighting.


Care should be exercised in the selection of primer & sealer paints to make sure it provides a bonding surface for the paint to be applied.  Before applying the primer or sealer, remove all loose dirt and dust by brushing with a soft brush.  Be sure the joint grouting is thorough dry before any application of sealer or paint.  Choice of emulsion paint / surface finish is subjected to the site condition & the recommendation of painting specialist.


K)   Surfaced spread of flame – the material shall be tested in accordance with B.S.476:Part 7 and shall be classified Class 1.


L)    The material shall not be affected by ultra-violet light.


M)   The material shall contain no asbestos.


N)    High quality hard casting plaster with low expansion coefficient shall be used.  Casting plaster manufactured in China, only top 10 suppliers in list can be used.


O)   Special designed polymers are to achieve improved tensile strength and reduce the permeability of the plaster.


P)    Proprietary mould release agents/waxes are to be applied to the moulds between each production.  The agents/waxes shall not have any adverse effect upon the surface of the component.


Q)   The component, where rectangular, shall be tested for squareness by measuring the diagonals.  The difference between the two measurements shall not exceed 0.5% of the length of the diagonal.


R)    The deviation from eh horizontal plane shall not exceed ±1mm in a 1 meter length.


S)    The dimensional accuracy of any component shall be within ±2mm per meter length.










1)     The suspension system for GRG & plasterglass shall be KIRII Ceiling Suspension System or equivalent.


2)     The ceiling furrings shall be made of hot-dip galvanized steel.  The cross sectioned dimension of C-Channel and M-Channel Furring shall be 38 x 12 x 1mm and 50 x 50 x 0.5mm respectively.


3)     As an alternative proposal, the supporting calculation shall be submitted and approved by the Architect to ensure that the structural is adequate to sustain the ceiling load.





1)     Ceiling board shall be “Winhop Series®” GRG or plasterglass, 4 to 12 mm thick according the design Architect’s.





1)     Installation of the 9mm dia. Threaded suspension both shall be fixed by suitable insert to the underneath of slab soffit.  Spacing of suspension both must be at 1220mm max. in either direction and at perimeter of ceiling as required.


2)     The Carrying channel (C-Channel) must be placed at 1220mm max. shall be hung to the lower part of the suspension bolts by means of galvanized steel hangers and nut.


3)     The double furring (M-Channel) at a spacing of 600mm max. shall be fixed to the carrying channel with double clips at each intersection.  Double Clips must as a rule alternate with the sides of the carrying channel.


4)     Rigid and aligned system for the fixing of ceiling board must be provided with separated pieces of carrying channel and double furring to be jointed by channel joint and double joint respectively.


5)     Extra hangers to be provided where opening are required for light fittings and access panels.


6)     All components must be well fixed and the suspension system must be correctly aligned and accurately leveled before attaching the ceiling board.




C)       INSTALLATION (Cont’d)



7)     The ceiling board shall be fixed by screws at 300mm max. to the double furring with long edges of the gypsum board placed parallel to the double furring.



8)     Finish of all joints and screw heads with “Boral” gypsum adhesive joint tape and ready mix jointing compound must b in accordance with manufacturer’s instruction with shall be approved by the Architect and sand smooth.


9)     Plastering and Painting works can be proceeded.





(1)        Level Marking


Mark the ceiling height on the surrounding walls according to the reference line.


(2)        Installing Suspension Hangers


Fit the hanger lightly to the lower part of the suspension bolt.


(3)        Installing Suspension Bolts.


Install the suspension bolt to the insert prepared on the stab soffit.


(4)        Installing C-Channels


Installing the c-Channel to the hanger.


(5)        Determining the Level


String and level the C-Channel according to the mark above, and tighten the hanger nut.


(6)        Installing Furring Channels.


Clip the furring channels to the C-Channel according to the backing allotment.  Clips must as a rule alternate with the sides of the C-Channel.


(7)        Installing Ceiling Board


Fix the board by bugle head screws to the furring channels at 300mm (12”) max.










(1)        Prepare production mould for fabrication.


(2)        Only pure gypsum and fine fiberglass can be used for production which must be the 10 (ten) suppliers in list according manufacturer specification.


(3)        Form sample for final approval by QC Manager and the Architect.


(4)        Forming product according the quantity.


(5)        Product will take 3-4 weeks to complete dry.


(6)        Quality check for all product, marking and labeling.


(7)        No allow cracking, delaminate or peeling production to ship out the factory.


(8)        Size for the curved ceiling panel for Venetian is 2200 x 2200 x 1000mm (L) with R=2000mm





(1)        Level Marking


            Mark the ceiling height on the surrounding walls according to the reference line.


(2)        Installing Suspension Hangers


Fit the GMS angle hanger - size 38 x 38 x 3mm thick (max. 1200mm c/c) with welded blacket to the slab soffit using anchor bolt.


(3)        Install C-Channel (Runner)


            Installing the C-Channel - size: 38 x 12 x 1mm thick (max. 1200mm c/c) to the hanger with screw.


(4)        Determining the Level


            String and level the C-Channel according to the mark above and tighten the hanger nut.


(5)        Install M-Channels (Furring)


            Clip the M-Channels size: 20 x 50 x 0.5mm thick, @600mm c/c, to the C-Channel to the backing allotment.  Clips must as a rule alternate with the sides of the C-Channel.


(6)        Installing Ceiling Board


            Fix the curved GRG or plasterglass ceiling board size: 2200 x 2200 x 12mm thick, R=2000mm by screw to the furring channels at 300mm (12”) max.