Chemical delignification treatment
Australia’s only chemical delignification specialists — and the holders of the Australian patent for the treatment.
Fully licensed & accredited — Builders Registration BC105819 · Painters Registration PC102072 · Patent ID AU-A-2020100623
Powerdrive Roofing is Australia’s only chemical delignification treatment specialist and holds the Australian patent for the process. Delignification is the salt-driven breakdown of roof timbers — caused by the high natural salt content of terracotta and clay tiles, not just coastal air. Our patented treatment restores strength to affected battens and framing from $25–$41/m², avoiding a full re-batten, and our findings are backed by multiple independent tests.
Treatment pricing
- $25–$41 / m² — Chemical delignification treatment (by severity & preparation)
Prices are a guide for standard Perth metro jobs and are confirmed after a free site inspection. GST inclusive.
What chemical delignification is
Timber gets its strength from lignin, the natural compound that binds its fibres together. Chemical delignification is the breakdown of that lignin — the timber goes soft, brittle and spongy, and loses its structural strength. In a roof, it attacks the battens and framing that hold the tiles or sheets in place.
A delignified batten can look intact from a distance yet crumble when pressed. Left unchecked, it leads to slipping tiles, sagging rooflines and, eventually, a roof that needs major structural work.
The real cause: salt in the tiles — not just the coast
For years delignification was assumed to be a coastal, salt-air problem. Our research — backed by multiple independent tests — shows the true cause runs deeper: terracotta and clay tiles themselves carry a high natural salt content.
Here’s the mechanism. Moisture held in the porous tiles leaches down into the roof timbers, carrying dissolved salts with it. As the timber dries, that salt crystallises — and the force of crystallisation breaks the lignin down at a cellular level, pushing it to the timber’s surface. Over years of wet-and-dry cycling, the timber is steadily destroyed from within.
Because the salt comes from the tiles, not the sea, delignification occurs wherever terracotta and clay tile roofs are found — inland suburbs and country towns just as much as coastal ones. Any Australian home with a terracotta or clay tile roof is a candidate.
Australia’s only specialists — and the patent holders
Powerdrive Roofing is the only chemical delignification treatment specialist in Australia, and we hold the Australian patent for the process (patent no. AU-A-2020100623). This isn’t a service a general roofer can offer or a competitor can simply copy — it’s a genuinely unique, protected treatment that we developed and continue to refine.
Our understanding of the salt-and-lignin mechanism, and the treatment that addresses it, is backed by multiple independent tests rather than marketing claims. When it comes to delignification, there is no second specialist to compare us to — which is exactly why homes across the country come to us.
What the treatment does
Our patented treatment restores strength to timber battens and framing that have begun to break down — without the cost and disruption of replacing them. Where the timber is caught in time, treatment saves you from a full re-batten or, in worse cases, a re-roof.
It works with the timber in place, which means no lifting large areas of the roof to swap out battens. That’s less disruption, less cost, and a roof that keeps its original structure — restored rather than rebuilt.
Treatment vs replacement
Caught in time, treatment is far cheaper and less invasive than replacing battens, which can mean stripping large sections of the roof. But delignification is progressive: left too long, the timber degrades beyond what treatment can restore, and replacement becomes the only option.
That’s why we assess honestly and recommend treatment or replacement based on what the timber actually needs. On most affected roofs, caught early, treatment at $25–$41/m² is the answer — and it’s the only one of its kind in Australia.
Signs your roof may be affected
Because delignification happens out of sight in the roof space and progresses slowly, it’s easy to miss — standard surface-only roof quotes walk straight past it. Warning signs include slipping or drummy tiles, a roofline that’s beginning to dip, and battens that are soft, discoloured or crumbling when pressed. A white, powdery salt residue on the timber is a classic tell.
If your home has a terracotta or clay tile roof — anywhere in Australia — it’s worth having the timber checked, not just the surface. A proper roof inspection catches delignification while treatment is still an option.
National coverage
Because delignification affects terracotta and clay roofs right across the country, we provide chemical delignification treatment nationally. Whatever your postcode, if your roof timbers are being broken down by tile-borne salt, we’re the specialists to call. Contact us with your location and roof type and we’ll advise on inspection and treatment for your area.
Find treatment in your city
We’re rolling out postcode-level coverage across Australia’s major cities — Sydney, Melbourne, Brisbane, Adelaide, Perth and Canberra. Perth is live now; if your city isn’t listed yet, contact us with your postcode and roof type.
Frequently asked questions
What is chemical delignification?
The salt-driven breakdown of lignin in roof timbers, leaving battens and framing soft, brittle and structurally weak. Powerdrive is Australia’s only treatment specialist and patent holder.
Is delignification only a coastal problem?
No — our independently-tested research shows it’s caused by the high natural salt content of terracotta and clay tiles themselves, so it occurs wherever tile roofs are found, inland as well as coastal.
What causes chemical delignification?
Moisture in porous terracotta/clay tiles leaches salt into the roof timbers; as the timber dries the salt crystallises and breaks down the lignin, destroying the timber’s strength from within.
How much does chemical delignification treatment cost?
From $25 to $41 per square metre, depending on severity and preparation, confirmed after an inspection.
Can delignified timber be treated instead of replaced?
Yes, if caught in time — our patented treatment restores strength to affected timber in place, avoiding a full re-batten. Advanced cases may still need replacement.
Do you hold a patent for the treatment?
Yes — Powerdrive Roofing holds the Australian patent for the chemical delignification treatment process, patent number AU-A-2020100623.
Who can treat chemical delignification?
Powerdrive Roofing is Australia’s only chemical delignification specialist and holds the Australian patent — it isn’t a treatment general roofers can offer.
Get a free, no-obligation quote → or call 0421 768 842. Backed by a 10-year workmanship and 15-year Dulux AcraTex paint warranty.