By Peter Ross

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This new ebook starts with a longer advent to bushes as a construction fabric: its a variety of varieties and homes, its reaction to environmental stipulations, and the development rules with regards to its use. It is going directly to keep on with the overall series of labor, beginning with the fee, after which facing the survey, the research and the appraisal

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Additional resources for Appraisal and Repair of Timber Structures

Sample text

The strength of timber In order to get some quantitative understanding of the strength of timber, look at the results of standardised tests in accordance with BS 373 (1957): Fig. 5 Static bending test using 300 Â 20 Â 20 mm specimen (Princes Risborough Laboratory, # Crown Copyright) 39 Appraisal and repair of timber structures Fig. 6 Results of small clear bending tests on (a) Redwood and (b) Greenheart 40 Methods of testing small clear specimens of timber. Clear specimens are straightgrained pieces, with no strength-reducing defects such as knots or ®ssures.

For preservation to be e€ective, therefore, it must be applied to the pro®led member. Hazard class 4: ground contact, is the most severe hazard class. Fence posts always fail at ground levelÐabove, the post is too dry, and below ground too wet. The transition zone will inevitably produce at some point the optimum moisture content for the development of rot. Timber properties and preservative treatments for the design of timber in di€erent building locations are given in BS 5268: Part 5 for structural work and in BS 5589 for non-structural work.

Construction of the nineteenth century is 27 Appraisal and repair of timber structures Fig. 14 Twentieth century timber framing 28 described by authors of the time, such as Newlands (1857) and Tredgold (1840). Construction of the twentieth century (with other materials) is given in textbooks such as McKay (1944) and Mitchell Building Series (Bromwell, 1976). Wainwright and Keyworth (1988) describe the modern timber frame in detail. Beckmann (1995) addresses the structural aspects of building conservation.

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