By Peter Ross
Trees is likely one of the oldest of mans development fabrics, yet as the development scene at the present time is ruled by means of concrete and metal, many designers are unexpected with the houses of trees and its structural vocabulary.
This new booklet starts off with a longer creation to bushes as a construction fabric: its a number of varieties and homes, its reaction to environmental stipulations, and the development laws in relation to its use. It is going directly to persist with the final series of labor, beginning with the fee, after which facing the survey, the research and the appraisal
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Additional info for Appraisal and Repair of Timber Structures
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. The bending test, for example, is carried out by loading 300 Â 20 Â 20 mm samples to failure over a period of a few minutes (Fig.
The growing tree the felled log, or timber undergoing seasoning in service as a building element. The prevention of fungal or insect attack in the ®rst two states will primarily have been the responsibility of the forester or the merchant. We are concerned mainly with the possibility of attack after the timber has been installed although, of course, not every piece may have been attackfree at the time of construction. Fungi The spores, or seeds, of fungi are microscopic and widely distributed by air currents.
Brush immersion vacuum/pressure treatment. Creosote, which is still the most eective preservative, is unlikely to have been used internally, in view of its powerful smell and tendency to bleed following pressure application. CCA generally has a slight green colour, and can be used on externally exposed timber, while OS is colourless but tends to leach out of the timber, and therefore needs, for example, a paint protection when used externally. Brush application results in negligible penetration of the timber, and immersion only marginally more so, although end grain, as one would expect, is around ten times more absorbent than side grain.
Appraisal and Repair of Timber Structures by Peter Ross