Finishing Timber Externally
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13 Finishing Timber Externally Technical Design Guide issued by Forest and Wood Products Australia 04 01 09 Building with Timber in Bushfire-prone Areas BCA Compliant Design and Construction Guide WoodSolutions is an industry initiative designed to provide Technical Design Guide issued by Forest and Wood Products Australia Timber-framed Construction for Townhouse Buildings Timber Flooring independent, non-proprietary information about timber and Class 1a Design guide for installation Design and construction guide for BCA compliant Technical Design Guide issued by Forest and Wood Products Australia sound and fire-rated construction wood products to professionals and companies involved in Technical Design Guide issued by Forest and Wood Products Australia building design and construction. WoodSolutions is resourced by Forest and Wood Products Technical Design Guides Australia (FWPA – www.fwpa.com.au). It is a collaborative effort A growing suite of information, technical and between FWPA members and levy payers, supported by industry training resources created to support the use of bodies and technical associations. wood in the design and construction of buildings. This work is supported by funding provided to FWPA by the Topics include: Commonwealth Government. #01 Timber-framed Construction for Townhouse Buildings Class 1a ISBN 978-1-921763-43-4 #02 Timber-framed Construction for Prepared by: Multi-residential Buildings Class 2, 3 & 9c Dr Jon Shanks & Associate Professor Greg Nolan #03 Timber-framed Construction for Centre for Sustainable Architecture with Wood Commercial Buildings Class 5, 6, 9a & 9b School of Architecture & Design University of Tasmania #04 Building with Timber in Bushfi re-prone Areas First published: May 2012 #05 Timber service life design - Design Guide for Durability © 2012 Forest and Wood Products Australia Limited. #06 Timber-framed Construction - All rights reserved. Sacrifi cial Timber Construction Joint These materials are published under the brand WoodSolutions by FWPA. #07 Plywood Box Beam Construction IMPORTANT NOTICE for Detached Housing Whilst all care has been taken to ensure the accuracy of the information #08 Stairs, Balustrades and Handrails contained in this publication, Forest and Wood Products Australia Limited and Class 1 Buildings - Construction WoodSolutions Australia and all persons associated with them (FWPA) as #09 Timber Flooring - Design Guide for Installation well as any other contributors make no representations or give any warranty regarding the use, suitability, validity, accuracy, completeness, currency or #10 Timber Windows and Doors reliability of the information, including any opinion or advice, contained in this publication. To the maximum extent permitted by law, FWPA disclaims all #11 Noise Transport Corridor Design Guide warranties of any kind, whether express or implied, including but not limited #12 Impact and Assessment of to any warranty that the information is up-to-date, complete, true, legally Moisture-affected, Timber-framed Construction compliant, accurate, non-misleading or suitable. #13 Finishing Timber Externally To the maximum extent permitted by law, FWPA excludes all liability in contract, tort (including negligence), or otherwise for any injury, loss or #14 Timber in Internal Design damage whatsoever (whether direct, indirect, special or consequential) arising out of or in connection with use or reliance on this publication (and #15 Building with Timber for Thermal Performance any information, opinions or advice therein) and whether caused by any #16 Massive Timber Construction Systems errors, defects, omissions or misrepresentations in this publication. Individual Cross-laminated Timber (CLT) requirements may vary from those discussed in this publication and you are advised to check with State authorities to ensure building compliance as well Other WoodSolutions Publications as make your own professional assessment of the relevant applicable laws R-Values for Timber-framed Building Elements and Standards. To view all current titles or for more information The work is copyright and protected under the terms of the Copyright Act visit woodsolutions.com.au 1968 (Cwth). All material may be reproduced in whole or in part, provided that it is not sold or used for commercial benefi t and its source (Forest & Wood Products Australia Limited) is acknowledged and the above disclaimer is included. Reproduction or copying for other purposes, which is strictly reserved only for the owner or licensee of copyright under the Copyright Act, is prohibited without the prior written consent of FWPA. Cover image: St Falls Architect: Elenberg Fraser WoodSolutions Australia is a registered business division of Forest and Photography Credit: Peter Bennetts Wood Products Australia Limited. Table of contents Introduction 4 1. Material basics 5 1.1 Introduction ....................................................................................................................................... 5 1.2 Timber characteristics ....................................................................................................................... 5 1.3 Moisture in timber.............................................................................................................................. 6 2. Timber products 8 2.1 Introduction ....................................................................................................................................... 8 2.2 Timber products summary ................................................................................................................9 3. Factors affecting the selection of finishes 10 3.1 Introduction ..................................................................................................................................... 10 3.2 Finish performance requirements ...................................................................................................10 3.3 Timber ............................................................................................................................................. 11 3.4 Site environment ............................................................................................................................. 14 3.5 Selecting timber and finishes appropriate for the conditions .........................................................15 4. Finishing systems 18 4.1 Introduction ..................................................................................................................................... 18 4.2 Finishing system basics ..................................................................................................................18 4.3 Finish type summary tables ............................................................................................................20 5. Applying & maintaining finishes 26 5.1 Introduction ..................................................................................................................................... 26 5.2 Site or factory applied finishes ........................................................................................................26 5.3 Surface preparation......................................................................................................................... 27 5.4 Application ...................................................................................................................................... 28 5.5 Maintenance ....................................................................................................................................28 6. Fasteners 29 6.1 Introduction ..................................................................................................................................... 29 6.2 Fasteners ......................................................................................................................................... 29 6.3 Detailing .......................................................................................................................................... 29 7. Finish selection summary 32 7.1 Introduction ..................................................................................................................................... 32 7.2 Finish selection summary ............................................................................................................... 32 8. Species information 35 #13 • Finishing Timber Externally Page 3 Introduction Finishing Timber Externally aims to provide an understanding of the important considerations of finishing timber elements externally. ‘Finishing’ includes surface treatments of timber elements, securing timber elements as part of a building envelope, and designing and detailing timber elements for maximum design life. This guide complements the Wood Solutions Guide #5 Timber service life design. Design guide for durability. That guide provides information on the use of bare or treated timber in many external applications including in-ground posts, decks, fences and pergolas, and should be consulted for detailed information on these uses. This guide, Wood Solutions Guide #13, concentrates on the finishes used with timber exposed externally in decks or as part of the building envelope, such as cladding or external joinery. Timber needs to be Timber needs to be well detailed, carefully selected and finished appropriately to work successfully in well detailed, carefully an external environment. This guide discusses