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Plywood

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. Photo: Plywood Association Australia.

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Plywood

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  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 Photo: Plywood Association Australia Aboriginal Studies building, Curtin University, Perth, WA Photo: Geoff Boughton

  2. face grain direction Seven laminates prior to gluing and pressing grain in face laminate Final plywood sheet Manufacture • Made by gluing and pressing thin laminates together to form a sheet • Grain in laminates in alternate directions - strength in two directions 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. Sydney Opera House Photo: Geoff Boughton Extensive use of wall and ceiling panels with decorative and acoustic functions. Chairs also feature plywood.

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

  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 Photo: Geoff Boughton

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

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

  11. Veneer Quality Decorative Quality A • 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

  12. Service classes • Type A bond • For exterior plywood used in conditions of full exposure, • Interior plywood used in wet or damp conditionseg 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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