Damp Course Injection Sydney
Rising damp is a common issue in Sydney’s older brick and sandstone homes, especially across the Inner West. It develops when ground moisture rises through porous masonry walls, causing musty smells, peeling paint, and crumbling plaster if left untreated. Damp course injection is the established solution.
BNZ Innovation Co. provides damp course injection for Sydney homeowners and businesses to rely on, backed by over 20 years of construction experience and a structural engineering background. We diagnose the cause first, treat the wall correctly, and provide a fixed written quote before any work begins.
What Is Damp Course Injection
Damp course injection treats rising damp at the source. Small, evenly spaced holes are drilled along the base of the affected wall, and a specialized damp-proofing chemical is injected into the mortar course, forming a continuous water-repellent barrier.
- Blocks rising moisture: Stops groundwater traveling up through brick and mortar.
- Lets the wall dry out: Trapped moisture above the barrier evaporates naturally over time.
- Prevents repeat damage: A correctly installed barrier removes the need for retreatment.
Where salt contamination is present, desalination is included as part of the service, not billed as an extra. Untreated salts continue drawing in moisture even after injection, so this is assessed during the initial inspection.
Persistent musty smell
An earthy odour in ground-floor rooms that doesn't clear with ventilation.
Tide marks or staining
Discolouration on walls, generally below the one-metre mark.
Peeling or bubbling paint
Often the first visible sign near skirting boards.
Crumbling plaster or mortar
Soft, powdery, or flaking material at the base of walls.
White salt deposits
It is known as efflorescence, left behind as moisture evaporates.
Rotting timber skirting
Soft or damaged skirting boards near wall bases.
A site inspection is recommended if more than one of these signs is present.
Damp Proof Injection Sydney
A damp-proof injection in Sydney needs to suit how local properties are built. Suburbs including Leichhardt, Annandale, Balmain, Rozelle, and Drummoyne contain solid brick terraces and federation homes built before modern damp courses were standard. Combined with Sydney’s clay-heavy soil and limited sub-floor ventilation in older properties, these conditions accelerate rising damp.
We assess wall thickness, mortar composition, and salt levels before determining chemical dosage and injection spacing for each wall. This tailored approach is what separates a treatment that holds for decades from a generic job that needs redoing within a few years.
Free site inspection
Confirms whether the issue is rising damp, condensation, or another moisture source.
Written quote
A fixed, written quote with no hidden costs.
Damp course injection
The barrier is installed with minimal mess and minimal disruption.
Desalination if required
Salt-affected walls are treated as part of the same job.
Finishing guidance
Advice on re-plastering timeframes once the wall has dried.
Why Choose BNZ Innovation Co.
20+ Years of Construction Experience
Over two decades working across Sydney residential and commercial properties, giving us practical, hands-on knowledge that spans far beyond a single trade or service.
Structural Engineering Background
Our team identifies and treats the underlying cause of rising damp rather than just the visible symptoms, reducing the chance of repeat issues later on.
Heritage and Character Home Experience
Proven, hands-on experience working on terraces, federation homes, and other character properties found throughout Leichhardt and the Inner West.
Free Site Inspections
Every job starts with a thorough, no-obligation inspection, so you know exactly what's causing the issue before committing to any work.
Transparent, Written Quotes
What's quoted is what's charged, with no hidden costs, no vague estimates, and no surprise add-ons once work has started.
Local Inner West Expertise
We understand the soil conditions, building styles, and damp issues specific to Leichhardt, Annandale, Balmain, Rozelle, and Drummoyne firsthand.
Frequently Asked Questions
How long does a damp course injection take?
Most walls take one to two days to inject. Full drying out can take several months as stored moisture is released from the brickwork.
How much does rising damp treatment cost in Sydney?
Cost depends on wall length, thickness, salt contamination, and whether desalination or plaster replacement is needed. A free inspection and written quote are provided first.
Will a damp course injection damage my walls?
How do I know if it's rising damp or condensation?
Rising damp shows as staining and salt deposits below one metre, while condensation affects a wider area, including ceilings. A site inspection confirms which one applies.
Can it be used on heritage or character homes?
Yes. We regularly treat terraces and federation homes and adjust the process for older brick and sandstone construction.
Do I need to vacate the property during treatment?
Book a Free Damp Inspection
Early signs of rising damp should be assessed before the damage spreads further. Contact BNZ Innovation Co. for a free site inspection and a clear, written quote.
Call 0401 701 690 or email info@bnzino.com.au to book a damp course injection consultation across Sydney, including Leichhardt and the Inner West.
