Construction

Appraisal and Repair of Timber Structures by Peter Ross

By Peter Ross

Trees is among the oldest of mans development fabrics, yet as the construction scene this present day is ruled through concrete and metal, many designers are unexpected with the houses of bushes and its structural vocabulary.

This new publication starts with a longer advent to trees as a development fabric: its quite a few kinds and houses, its reaction to environmental stipulations, and the construction laws in terms of its use. It is going directly to persist with the overall series of labor, beginning with the fee, after which facing the survey, the research and the appraisal

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At the same time, the properties of the timber change; both the strength and the sti€ness (the modulus of elasticity or E value) increase as the MC reduces. Eventually (for a given relative humidity (RH) of the surrounding air) the MC will stabilise at a value known as the equilibrium moisture content (EMC). The relationship between air RH and timber EMC is shown in Fig. 3. It can be seen that the di€erence between the graph for 308C and 108C is only The characteristics of timber Fig. 3 Relationship between RH and EMC 35 Appraisal and repair of timber structures Fig.

Brush immersion vacuum/pressure treatment. Creosote, which is still the most e€ective 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.

While this was possible in plywood manufacture, it was dicult to heat large structural components. The urea±formaldehyde glues, which cured at normal interior temperatures, were developed commercially during the second World War, and used on the later models of the Mosquito aeroplane. From the 1950s onward, glued laminated beams with moisture resistant adhesives came into general use for structural work, and allowed the fabrication of timber elements which were limited in size only by considerations of transport (Fig.

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