Conservation of heritage places
This online fact sheet shows what conservation and maintenance issues you should consider before you undertake any new work on a heritage place.
Important conservation principles
The following principles for preserving and enhancing the value of a heritage building are in line with the Burra Charter. The charter provides guidance for conserving and managing places of cultural significance.
Do as little as possible, but as much as necessary
- Adopt a minimalist approach to conservation (which can reduce the cost of new materials).
- You can preserve or restore a building’s heritage significance, but not improve it, by changing it into something it is not (e.g. trying to transform a modest cottage into a grand house).
Repair where possible
- Look after the original material and components of a heritage place or building. They are integral to its cultural significance.
- Carry out minimal intervention to avoid destroying the heritage value.
- Supplement or replace only unsound material.
- Stabilise, consolidate or repair the existing structure and materials if possible.
Reconstruct only with physical or documentary evidence
- Contact Brisbane City Council for information on the cultural heritage significance of the place.
- Research the history of your house.
- Look for evidence of original elements and details to work out how to reinstate or reconstruct them.
- Undertake reconstruction work only when there is enough evidence. Otherwise, construct it in a way that is sympathetic but easily identifiable as new work.
Undertaking conservation work
Careful planning is essential to carry out conservation work and make alterations without detracting from the heritage place’s significance. Base planning on the specific needs of the building or site’s specific requirements.
You should thoroughly research all conservation and adaptation projects before you make any decisions about construction work.
It is not just the original house on the site that may be important. Before undertaking any work, you should also consider other elements such as fences, gates, outbuildings and gardens. These items all make a contribution to the building's heritage significance.
A conservation plan is the best way to help make informed decisions about what is required.
- Re-open verandahs if possible and reinstate original features to help restore the house’s original appearance. It will also increase ventilation and provide a shaded, semi-outdoor environment.
- Avoid closing in verandahs. This can detract from the appearance of the house, as well as affecting interior ventilation, light and temperature.
- Ensure alterations to enclose a verandah for more living space are reversible.
- Use old photos of the house, or houses of a similar style and period, to restore extensively altered verandahs.
Roofing and guttering
- Conserve original roof sheeting as much as possible. Sheeting is usually made of galvanised steel sheeting in short lengths. It is fixed with lead-headed nails and finished with scribed hip and ridge capping.
- Replace original roof sheeting if required with long lengths of galvanised sheets and cyclone screw fixings. These provide better protection and only slightly change the appearance.
- Avoid using materials such as modern square-rib profile roofing, metal tiles, square guttering, PVC downpipes and uncoated zincalume sheeting. They detract from the appearance and cultural significance of a heritage building.
- Conserve early guttering as much as possible. Galvanised half-round or ogee profile and later quad and downpipes were mostly round or rectangular galvanised steel. Gutters were often painted to fit the colour scheme of the building.
- Repair the roof by replacing existing timber members with identical-sized material where available.
- Remove timber damaged by rot or termites. Cut off and dovetail (splice) in a new piece where there is enough of the section remaining for structural performance. Alternatively, reinforce timber members with bolted steel plates.
- Treat decayed timber with preservative and fill damaged sections with epoxy resin depending on the extent of decay.
- Retain all items, patch or repair if possible with new timber, rather than remove and replace.
- Match the original or significant components as faithfully as possible when replacing timber elements and structures.
- Use epoxy resin for repairing timber structurally weakened by termite damage.
Undertaking maintenance work
Maintenance is an important part of conservation. Undertake a thorough inspection of the building before making any alterations. Carry out the following building checks.
- Consult a structural engineer with expertise in old buildings, if there is cracking, deflection, bulging or failure of walls.
- Ensure that floor framing is sitting securely on supporting members and that flooring is level. Otherwise, new doors might not close properly and newly-laid tiles might crack.
- Protect the building from water and weather. Use sound roofing, flashing and damp-proofing methods which allow the building to breathe.
- Repair leaking roofs, gutters, downpipes and any other leaks in the building.
- Inspect timber stumps for rot or termite damage.
- Ensure ant caps are intact and termites are not present.
- Make provision for ongoing termite prevention.
- Inspect concrete stumps for ‘concrete cancer’ caused by reinforcing bars rusting and expanding, causing concrete to crack away.
Check heritage fact sheets:
- analysing paints to identify original colours
- traditional types of paints and finishes
- the painting process
- scope of painting.
- Remove paint from masonry walls that were originally unpainted.
- Use a cleaning method for masonry that is appropriate for the job and condition of the surface.
- Avoid sand-blasting as this is generally too harsh for most materials.
- Re-point masonry only where existing mortar is unsound or where sufficient mortar is missing to cause detrimental water penetration.
- Use a mortar mix that is no stronger than the original mix used in the building. This will restrict future cracking to the joints rather than the bricks or stone.
- Consult a licensed electrician to check, repair or replace electrical wiring as required to minimise the risk of fire.
- Install new services such as ductwork, pipework, wiring conduits, air conditioning carefully to minimise damage.
- Check plumbing and drainage for leaks.
Check heritage fact sheets which provide useful tips on caring for heritage properties:
- Evans, Ian, 'Restoration', in The Queensland House: a roof over our heads, eds Rod Fisher and Brian Crozier, Queensland Museum, Brisbane 1994.
- Evans, Ian, Getting the details right: restoring Australian houses 1890s-1920s, Flannel Flower Press, Yeronga, Queensland, 1989.
- Evans, Ian and National Trust of Queensland, The Queensland House: history and conservation, Flannel Flower Press, Mullumbimby, 2001.
- Heritage Victoria, 'Corrugated roofing; Cleaning masonry' 2001.
- Marquis-Kyle, Peter and Meredith Walker, The Illustrated Burra Charter: making good decisions about the care of important places, Australia ICOMOS, Brisbane, 1992.
- National Trust of Queensland, 'Before you start', Conserving the Queensland house, Brisbane, 1994 (guide 1 of 12).
- NSW Heritage Office, Heritage information series: 'How to carry out work on heritage buildings and sites', 1995.
For more information, contact Council.