Heritage buildings are often more vulnerable to water ingress due to ageing materials, outdated construction methods, and decades of weather exposure. While protection is essential, inappropriate waterproofing can damage historic fabric, trap moisture, or visually alter the façade. The challenge is creating a system that delivers modern performance while maintaining complete respect for the building's history and heritage requirements.
At Atomic Projects, we combine conservation principles with advanced waterproofing technology, ensuring long-term protection without compromising heritage value. Our work complies with Heritage Council guidelines, Burra Charter principles, and relevant Australian Standards.
Our Heritage Waterproofing Process
- Heritage Assessment & Approvals
- Collaborate with heritage consultants and architects to document existing conditions.
- Secure necessary permits and approvals from heritage authorities.
- Material Compatibility Testing
- Assess original materials — stone, brick, render, lead, timber — for porosity, salt content, and compatibility with proposed treatments.
- Moisture & Leak Investigation
- Use non-invasive methods such as moisture meters, infrared scanning, and drone inspection to identify ingress points.
- System Selection
- Prioritise breathable membranes, vapour-permeable coatings, and discreet detailing to maintain material performance.
- Avoid coatings that seal moisture in or change the building's appearance.
- Installation
- Apply systems by hand, low-pressure spray, or brush depending on substrate sensitivity.
- Integrate flashing upgrades, discreet drainage solutions, and joint remediation where needed.
- Final QA & Documentation
- Provide photographic records, maintenance recommendations, and warranty documentation.
- Ensure all interventions are fully reversible wherever possible.
Common Heritage Waterproofing Applications
- Parapet and cornice sealing.
- Below-ground tanking and negative waterproofing for heritage basements.
- Lead flashings and copper cappings restoration.
- Clear, breathable façade water repellents.
- Waterproofing for decorative stonework and masonry features.
Why Atomic Projects for Heritage Waterproofing
- Heritage-Specific Expertise: Skilled in conservation methodology and heritage approvals.
- Discreet Protection: Systems that safeguard without altering appearance or texture.
- Reversibility: Works can be removed or updated without damaging original materials.
- Long-Term Value: Protects against costly structural repairs caused by long-term moisture ingress.
Frequently Asked Questions
Do we need heritage council approval before waterproofing a heritage building?
Yes, in most cases. Works to a heritage-listed building that could affect its fabric, appearance, or character typically require approval from the relevant heritage authority — either the NSW Heritage Council (for State-listed items) or the local council (for locally-listed items). We work alongside heritage consultants and architects to prepare the necessary documentation and facilitate approvals before works begin.
Why can't we use standard waterproofing products on a heritage building?
Standard waterproofing products are often film-forming coatings that prevent moisture vapour from escaping the masonry. On historic buildings with porous stone, brick, or lime render, trapping moisture within the substrate can cause accelerated spalling, salt crystallisation, and irreversible fabric damage. Heritage waterproofing requires breathable, vapour-permeable systems that protect against liquid water without disrupting the building's natural moisture balance.
How do you investigate moisture ingress without damaging heritage fabric?
We use non-invasive investigation techniques including calibrated moisture meters, thermal imaging cameras, and drone inspection to map ingress areas and identify likely causes. Where minor invasive investigation is needed, we work to minimum intervention principles — using the smallest access points possible and making good any openings with compatible materials to heritage standards.
Can heritage waterproofing be visually invisible?
Yes. Breathable, clear silane-based water repellent treatments penetrate the substrate and provide protection without altering colour, texture, or appearance. For joints and penetrations, we use discreet flashing and sealant systems that are colour-matched to the existing fabric wherever possible. Our goal is always to protect without leaving a visible trace.
What Australian standards and guidelines govern heritage waterproofing?
Heritage waterproofing must comply with the Australia ICOMOS Burra Charter (which governs conservation principles), applicable NSW Heritage Office guidelines, and relevant Australian Standards for the specific products and methods used. NCC provisions for waterproofing also apply. We engage heritage architects and consultants as needed to ensure full compliance with the applicable framework.
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