Half the damp we see in Perth is not a failed damp course. It is a working one that has been buried.
Talk it throughRising Damp Perth arranges damp assessments across Perth metropolitan area.
Every time a path is poured, a garden bed is topped up or paving is laid against a wall, the ground outside rises. When it rises above the damp course, water simply travels over the top of the barrier. The damp course is intact and irrelevant.
Perth's sand drains fast, which hides drainage faults until winter. A downpipe discharging at the base of a wall, or a reticulation line running along it, keeps the ground charged through the wet months.
The order matters. Injecting a damp course into a wall whose real problem is a paved garden bed is money spent on the wrong thing, which is why the assessment comes first and the quote comes after.
Moisture meter readings at height intervals up the wall, an external check of ground levels, paving and reticulation, and a look at what coatings are already on the wall.
Rising damp, lateral damp through a retaining or buried wall, a plumbing or reticulation leak, condensation, or bore-water staining. They look alike and cost very differently.
If paving has buried the damp course or a garden bed sits against the wall, that is corrected before any chemical course is considered. Injecting around a bridge does nothing.
A chemical course injected into the mortar line, sized to the wall material.
Contaminated render removed and replaced with a salt-retarding, breathable system. Skipping this is why treated walls come back.
A treated wall dries over months, not days. Anyone promising a finished wall in a fortnight is telling you what you want to hear.
What follows is indicative. Every one of these is a range because the wall decides, not the website.
| Work | Indicative range | What it covers |
|---|---|---|
| Assessment and moisture survey | $250 - $450 | Moisture readings across the affected walls, a look at ground levels and drainage, and a written finding on which of the four common causes you actually have. |
| Chemical damp-proof course, per metre | $180 - $340 | Injected into the mortar course. Limestone generally sits at the upper end because it takes more material to achieve a continuous barrier. |
| Salt-retarding replaster, per square metre | $120 - $260 | Old contaminated render off, breathable system on. Frequently the larger part of the job. |
| Drainage and ground-level correction | $900 - $6,000 | Lowering paving, cutting back garden beds, adding a drain. Where the cause is bridging rather than a failed damp course, this is the fix. |
| Subfloor ventilation improvement | $1,200 - $4,500 | Less common in Perth than Brisbane because fewer homes have a ventilated subfloor, but it applies to the older timber-floored stock. |
Prices are indicative ranges only. Limestone, double brick and rendered walls each cost differently to treat, and every fixed price follows an on-site assessment.
We arrange assessments across the Perth metropolitan area, including:
Rising Damp Perth