Rising Damp Specialists · The Gap
Salt tide-marks, peeling paint and that musty smell along the skirting boards? We diagnose and permanently treat rising damp in The Gap's older Queenslanders and brick homes — with a proper diagnosis and a permanent fix, not a paint-over.
Tell us what you're seeing — or what your building report said — and we'll arrange a no-obligation on-site inspection and written quote.
We connect you with QBCC-licensed damp specialists servicing inner Brisbane. No obligation. The specialist's assessment fee is $450 plus GST. That includes up to two hours on site diagnosis, that may include camera inspection of the stormwater drains.
Why The Gap homes are prone to damp: The Gap sits in a valley between Mt Coot-tha and Enoggera Hill, ringed by ranges that funnel overland flow and flash creek rises down onto the valley floor. In February 2022, Enoggera and Fish Creeks flooded streets including Tennis Avenue and Davidson Street. Its mostly post-war brick homes on sloping blocks get flood-wetted foundations, cut-in subfloors and poor under-house ventilation — the real damp drivers here.
Know the signs
Rising damp only affects ground-floor walls, because the moisture comes from the soil. If you're seeing these signs low on the wall, it's worth a proper look before it damages the timber and brickwork.
SIGN 01
A horizontal stain about a metre up the wall, where the rising moisture peaks and evaporates.
SIGN 02
Efflorescence — ground salts crystallising on the brick or plaster surface.
SIGN 03
Finishes lifting and crumbling near the base of the wall.
SIGN 04
Soft, damp or warped skirting boards, architraves and floor timbers.
SIGN 05
A persistent damp, earthy odour, often strongest in closed rooms and low cupboards.
SIGN 06
In bad cases, the face of the brick crumbles away as the salts destroy the mortar.
Local knowledge
The Gap (4061) is different from the older inner suburbs: it was farmland subdivided from the late 1950s, so the stock is mostly post-war brick-and-tile homes, many lowset or split-level on sloping blocks, rather than pre-war timber cottages. It sits in the valley — the 'gap' — between Mt Coot-tha and Enoggera Hill, drained by Fish Creek and Enoggera Creek.
Ringed by ranges, the valley collects overland flow and flash creek rises. In February 2022, Enoggera and Fish Creeks flooded The Gap, with locations including Tennis Avenue, Davidson Street, Georgia Place and Walton Bridge Reserve affected. Most of the suburb isn't flood-prone — the risk concentrates in the creek corridors and low crossings, and Council's 2025 flood-map update added Gap properties to the creek/overland-flow mapping. Check your address on Brisbane City Council's Flood Awareness Map.
The later brick stock is less classically 'rising damp' than pre-war masonry, but flood-wetted foundations, cut-in subfloors on the sloping blocks, and poor under-house ventilation are the honest damp drivers here. We diagnose the actual cause at the assessment — often subfloor ventilation and drainage, with a chemical DPC where masonry is wicking moisture.
Nearby suburbs
How we fix it
Rising damp is often misdiagnosed as condensation or a leak, which need completely different fixes. We diagnose the actual cause first, then treat the source — not just the stain. It’s the same rising damp treatment in Brisbane we bring to every inner-suburb Queenslander.
We inspect with moisture meters, confirm it's genuinely rising damp, and rule out condensation or lateral damp.
We inject a new DPC into the mortar course — a water-repellent barrier that stops moisture rising, without removing bricks.
We strip salt-damaged plaster and apply a salt-retarding render so the damage doesn't return through the new surface.
We make good the wall and back the work with a 2-year warranty. If it's needed, we'll advise on subfloor ventilation too.
Our services
A new damp-proof course injected into the wall to permanently stop rising damp.
Learn more →Fans and vents to dry out the subfloor of Queenslanders on brick piers.
Learn more →Removing hygroscopic salts and re-rendering so the damage doesn't creep back.
Learn more →Fixing damp bridging from garden beds, paths and retaining walls.
Learn more →Transparent pricing
Rising damp treatment is usually priced by the linear metre of affected wall, so the size of the problem drives the cost. As a 2026 guide across Australia: a specialist damp assessment typically runs $500–$1,500 (ours is free), a chemical damp-proof course from a few thousand dollars up to around $15,000 on larger double-brick homes, subfloor ventilation about $1,500–$5,000, and re-rendering salt-damaged plaster roughly $3,000–$10,000 per wall.
Most single-room The Gap jobs land in the low-to-mid thousands
Your home may need only one of these or a combination — the only way to know for your home is a free call.
Indicative figures only — wall length, damp height and salt damage all change the price. We quote fixed, in writing, after the assessment.Common questions
Rising damp only affects ground-floor walls and peaks at a fairly even height — about a metre up — often with a salt tide-mark. Condensation usually shows higher and in corners or on cold surfaces; a leak is more localised. We confirm which one it is with moisture meters on site, because the three need completely different fixes.
That's one of the most common reasons The Gap owners call us. A building inspector flags the problem but doesn't fix it. We come out, confirm the extent, and give you a written quote you can use to negotiate on the purchase or plan the repair. Send us a photo of the report finding and we'll talk you through it.
If it's treated properly — a correctly installed chemical DPC plus salt-retarding render — it shouldn't. The 2-year warranty covers the workmanship. Paint-overs and quick fixes are what come back, because they don't stop the moisture at the source.
Yes — that's the bulk of the work in The Gap. Older Queenslanders often have no damp-proof course and poor subfloor airflow, so we frequently pair the DPC treatment with subfloor ventilation to keep the underfloor space dry.
Most residential jobs take one to a few days depending on wall length and how much plaster needs replacing. In most cases you can stay in the home; if a room needs to be closed off during treatment we'll let you know in advance.
Most of The Gap isn't flood-prone, but the valley collects overland flow and flash creek rises off the surrounding ranges. In February 2022 Enoggera and Fish Creeks flooded creek-corridor streets including Tennis Avenue and Davidson Street, and Council's 2025 maps added Gap properties to the creek/overland-flow risk. Check your address on the Flood Awareness Map.
It can, though the bigger issues in The Gap's post-war brick homes are usually subfloor moisture and poor under-house ventilation, plus flood-wetted foundations near the creeks. On sloping, cut-in blocks moisture presses against the lower walls. We diagnose the real cause and treat it — often subfloor ventilation and drainage, with a DPC where needed.
Yes — the work is carried out by QBCC-licensed damp and waterproofing specialists, fully insured, to Australian standards.
Tell us what you're seeing — or what your building report said — and we'll arrange a no-obligation on-site inspection and written quote.
We connect you with QBCC-licensed damp specialists servicing The Gap. No obligation. The specialist's assessment fee is $450 plus GST. That includes up to two hours on site diagnosis, that may include camera inspection of the stormwater drains.
Nearby areas
Rising Damp