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Plywood  Both decorative and structural  Sheet product suitable for panelling structural flooring bracing webs in composite beams  Standard size sheet.

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Presentation on theme: "Plywood  Both decorative and structural  Sheet product suitable for panelling structural flooring bracing webs in composite beams  Standard size sheet."— Presentation transcript:

1 Plywood  Both decorative and structural  Sheet product suitable for panelling structural flooring bracing webs in composite beams  Standard size sheet 2700  1200 mm 2400  1200 mm 1800  1200 mm Aboriginal Studies building, Curtin University, Perth, WA Photo: Geoff Boughton Photo: Plywood Association Australia

2 Manufacture  Made by gluing and pressing thin laminates together to form a sheet  Grain in laminates in alternate directions - strength in two directions Final plywood sheet Seven laminates prior to gluing and pressing face grain direction grain in face laminate Photo: Geoff Boughton

3 Uses  Panels (decorative, acoustic or bracing)  Sheets - plate bending (flooring, formwork)  Webs (I-beams, box beams)  Structural or appearance function for all of the above

4 Panels Colour-matched ceiling panels National wine Centre, Adelaide Photo: Trevor Fox Australian Timber Design: 11

5 Extensive use of wall and ceiling panels with decorative and acoustic functions. Chairs also feature plywood. Sydney Opera House Photo: Geoff Boughton

6 Decorative plywood with structural function Handrails are structural Decorative panels also have bracing function Exhibition buildings, Homebush, Sydney Photos: Geoff Boughton Observation deck, Sydney Showgrounds Photos: Geoff Boughton

7 Sheets Acts in minor axis bending in  Flooring Can span in two directions High strength material can be used for low profile floors Photo: Plywood Association Australia

8 Sheets  Formwork – requires: Good surface finish Water tight construction Glues must be water resistant Strength and stiffness to prevent failure and sagging under wet concrete loads Photo: Geoff Boughton

9 Webs and gussets High in-plane shear strength makes plywood ideal for webs and gussets in composite beams and portal frames C-section purlin Box section portal frame Photo: Geoff Boughton

10 Plywood as wind bracing Plywood gussets on Glulam portal Plywood gussets on box beam portals Salvation Army Church, Dural, NSW Photo: Greg Nolan Photo: Geoff Boughton Photo: Keith Crews

11 Veneer Quality  Veneer Quality A High quality appearance grade Suitable for clear finishing Specified when surface appearance critical  Veneer Quality S Appearance grade Natural characteristics decorative feature  Veneer Quality B Appearance grade suitable for high quality paint finish  Veneer Quality C Non-appearance grade with solid (filled) surface Suitable for flooring that will have decorative overlay  Veneer Quality D Non-appearance grade with open imperfections Suitable for structural plywood bracing Sports stadium floor Photo: Plywood Association Australia Decorative Quality A

12 Service classes  Type A bond For exterior plywood used in conditions of full exposure, Interior plywood used in wet or damp conditions eg around sinks, vanity units, laundry tubs.  Type B bond Suitable for applications involving up to 2 years exposure to weather eg concrete formwork Used permanently in semi exposed applications eg exterior door skins  Type C & D bonds Internal, dry conditions only Non-structural

13 Properties of Plywood  Low variability in properties - reliable  Usually graded as F-grade products (see Table 5.1 in AS1720.1 for plywood properties)  Specify: Stress grade Thickness and number of plies Glues – interior, exterior, marine Quality of face finishes Species used on face and other plies


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