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Span tables for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings

TRADA Technology Design Aid DA 1/2004

© TRADA Technology Ltd 2004 Reprinted with amendments March 2005 ISBN 1 900510 46 4

Chiltern House Stocking Lane Hughenden Valley High Wycombe Buckinghamshire HP14 4ND UK t: +44 (0)1494 569600 f: +44 (0)1494 565487 w: www.trada.co.uk e: [email protected]

TRADA Technology Ltd. Span tables for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings

Whilst every effort is made to ensure the accuracy of the advice given, the company cannot accept liability for loss or damage arising from the information supplied. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form, by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright owners.

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TRADA Technology Ltd. Span tables for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings

Contents

Page

Preface TRADA ` 1.0 2.0 2.1 3.0 3.1 3.2 4.0 4.1 4.2 4.3 4.4 4.5 5.0 Appendix 1 Explanatory notes: FAQs TRADA Technology Introduction Timber specifications Timber availability Design considerations Loading Construction and basic workmanship recommendations Tables of sizes of timber members Floor joists Ceiling joists and binders supporting ceiling joists Rafters and purlins supporting rafters Flat roof joists Purlins supporting sheeting or cladding References

5 6 6 7 9 10 11 11 12 13 15 19 23 37 43 46

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Page amended Feb 05

TRADA Technology Ltd. Span tables for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings

Page

List of Figures

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Snow roof loading zones. Key to Tables 6 ­ 45. Floor joists arrangement. Ceiling joists and binders arrangement. Typical rafters and purlin arrangement. Typical flat roof joists arrangement. Purlins supporting roof sheeting or cladding arrangement. 11 13 15 19 23 36 43

List of Tables

Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Table 25 Table 26 Table 27 Table 28 Table 29 Table 30 Table 31 Table 32 Table 33 Table 34 Table 35 Table 36 Table 37 Table 38 Table 39 Table 40 Table 41 Table 42 Table 43 Table 44 Table 45 Imposed loads for floors, ceilings and roofs. Common species/grade combinations which satisfy the requirements for the strength classes to which Tables 6-45 relate. Imposed roof loads for the zones defined in Figure 1. Strutting or blocking of joists. Summary of Tables 6 ­ 45. Domestic floor joists. C16 timber. Domestic floor joists. C24 timber. Ceiling joists. C16 timber. Ceiling joists. C24 timber. Ceiling binders. C16 timber. Ceiling binders. C24 timber. 2 Common or jack rafters. Roof slope 15o - 22.5o. Imposed load 0.75 kN/m . C16 timber. o o 2 Common or jack rafters. Roof slope 15 - 22.5 . Imposed load 0.75 kN/m . C24 timber. 2 Purlins supporting rafters. Roof slope 15o - 22.5o. Imposed load 0.75 kN/m . C16 timber. o o Imposed load 0.75 kN/m2. C24 timber. Purlins supporting rafters. Roof slope 15 - 22.5 . Common or jack rafters. Roof slope 15o - 22.5o. Imposed load 1.0 kN/m2. C16 timber. o o 2 Common or jack rafters. Roof slope 15 - 22.5 . Imposed load 1.0 kN/m . C24 timber. o o 2 Purlins supporting rafters. Roof slope 15 - 22.5 . Imposed load 1.0 kN/m . C16 timber. o o 2 Purlins supporting rafters. Roof slope 15 - 22.5 . Imposed load 1.0 kN/m . C24 timber. o 2 Common or jack rafters. Roof slope 22.5 - 30°. Imposed load 0.75 kN/m . C16 timber. Common or jack rafters. Roof slope 22.5o - 30°. Imposed load 0.75 kN/m2. C24 timber. o Imposed load 0.75 kN/m2. C16 timber. Purlins supporting rafters. Roof slope 22.5 - 30°. 2 Purlins supporting rafters. Roof slope 22.5o - 30°. Imposed load 0.75 kN/m . C24 timber. o 2 Common or jack rafters. Roof slope 22.5 - 30°. Imposed load 1.0 kN/m . C16 timber. 2 Common or jack rafters. Roof slope 22.5o - 30°. Imposed load 1.0 kN/m . C24 timber. o Imposed load 1.0 kN/m2. C16 timber. Purlins supporting rafters. Roof slope 22.5 - 30°. o Purlins supporting rafters. Roof slope 22.5 - 30°. Imposed load 1.0 kN/m2. C24 timber. 2 Common or jack rafters. Roof slope 30° - 45°. Imposed load 0.75 kN/m . C16 timber. Common or jack rafters. Roof slope 30° - 45°. Imposed load 0.75 kN/m2. C24 timber. 2 Purlins supporting rafters. Roof slope 30° - 45°. Imposed load 0.75 kN/m . C16 timber. Purlins supporting rafters. Roof slope 30° - 45°. Imposed load 0.75 kN/m2. C24 timber. 2 Common or jack rafters. Roof slope 30° - 45°. Imposed load 1.0 kN/m . C16 timber. Common or jack rafters. Roof slope 30° - 45°. Imposed load 1.0 kN/m2. C24 timber. 2 Purlins supporting rafters. Roof slope 30° - 45°. Imposed load 1.0 kN/m . C16 timber. Purlins supporting rafters. Roof slope 30° - 45°. Imposed load 1.0 kN/m2. C24 timber. 2 Joists for flat roofs with access for maintenance and repair only. Imposed load 0.75 kN/m . C16 timber. Joists for flat roofs with access for maintenance and repair only. Imposed load 0.75 kN/m2. C24 timber. 2 Joists for flat roofs with access for maintenance and repair only. Imposed load 1.0 kN/m . C16 timber. Joists for flat roofs with access for maintenance and repair only. Imposed load 1.0 kN/m2. C24 timber. 2 Joists for flat roofs with unlimited access. Imposed load 1.5 kN/m . C16 timber. Joists for flat roofs with unlimited access. Imposed load 1.5 kN/m2. C24 timber. Purlins supporting roof sheeting or cladding. Roof slope 10o - 35°.Imposed load 0.75 kN/m2. C16 timber. Purlins supporting roof sheeting or cladding. Roof slope 10o - 35°.Imposed load 0.75 kN/m2. C24 timber. o 2 Purlins supporting roof sheeting or cladding. Roof slope 10 - 35°.Imposed load 1.0 kN/m . C16 timber. Purlins supporting roof sheeting or cladding. Roof slope 10o - 35°.Imposed load 1.0 kN/m2. C24 timber. 7 9 11 12 14 16 17 19 20 21 21 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 37 38 39 40 41 42 44 44 45 45

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