Assessing the Suitability of Typical Timber Testing Methods for Australian Heritage Timber Structures

Abstract

This research aims to examine the applicability of conventional inspection methods for timber structures where structures have recognised heritage value. The research seeks to understand the appropriateness of inspection methodologies typically prescribed for timber in heritage applications. A literature review of current inspection methods utilised by engineers, architects and others within the heritage structures field has been undertaken, and the appropriateness of timber structural inspection methods used in practice (destructive testing, semi-destructive testing, and non-destructive testing methods) reviewed in light of heritage aims for Australian structures, and interviews conducted with practicing industry professionals to discuss uptake of these methods in practice.

A review of current literature indicates that non-destructive technologies present significant potential for further analysis of timbers in-situ without damage to the fabric itself, and represent a particular opportunity for heritage sites, as analysis can be conducted with minimal invasiveness. Interviews with practicing professionals within this industry indicates that currently, such methods have been incorporated only minimally into standard professional practice methodologies. While a lack of familiarity with many available methods is evident, the reasons behind the limited uptake are complex, including but not limited to a lack of pre-defined Australian guidelines prescribing their use, a perception of high associated costs, and an unwillingness on the part of clients to request the use of these methods.

It is found that significant opportunity exists for an improvement in the uptake of non-destructive methods as preferential over semi-destructive test methods. Indicative processes of example best-practice methods incorporating non-destructive testing into a typical assessment regime are presented.