Environmental Pressures

Seismic upgrade and compliance is also triggered by the Building Act 2011 when a building undergoes significant alteration, and where it is considered that 50% of the building volume will be altered. It is also triggered by change of use as determined by the issue of a Certificate of Occupation. For a complex site, several works over time can cumulatively add up to 50%, but general maintenance and conservation works would not normally constitute significant alteration.

The Prison complex is in close proximity to a marine environment and therefore susceptible to salt attack from sea spray. There is evidence of salt attack in a number of locations throughout the Prison complex. It is possible that the salt attack is related to the marine environment as well as high salinity content within the subsoil. Where salt is present the limestone is in poor condition. This may also be attributed to the presence of inappropriate cement-based mortars and renders.

Roofing materials, such as galvanised metal, have shorter lifespans when exposed to marine environments. The salt can accelerate the rusting process. Incompatible materials will also hasten the galvanic reaction process.

Pest management is also critical at Fremantle Prison, with some termite (white ant) damage in the Anglican Chapel. Bird nesting and guano are other potential problems.