Author: T. Ryan
1 February 2016
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In contrast, the need to maintain a balance of moisture and flexibility in the body of an old wall is essential. Ignoring this will lead to the classic error of repointing old structures in brittle, impermeable Portland cement(OPC) mortar. The mortar provides the route for evaporation from the core and should be more permeable than the brick or stone. To reverse this by sealing the joints with a hard finish can only lead to trouble.
Our built heritage is a finite resource stretching back thousands of years. Protecting and conserving this heritage is a challenge requiring knowledge, skills and experience, together with an ability to bring practical engineering judgement and often creative and imaginative solutions. This paper sets out the challenges faced by engineers and some of the approaches taken in the appraisal and protection of ruins.
In this article, issues associated with the scaffolding of historic structures are briefly explored and illustrated through four case studies. These are projects that crossed the author's desk, as a consulting engineer specialising in the conservation of historic structures, within a few months of each other. They explore some of the constraints imposed by 'historic fabric' and other factors, the compromises made, and the solutions reached.
This article continues from the previous instalment in the series, and aims to guide engineers in assessing the extent of corrosion of steel frames and in selecting appropriate treatment methods.