07725 314415DOFF Chemical Cleaning across Devon
DOFF is a Stonehealth-manufactured low-pressure steam system used by heritage specialists across the UK. It cleans masonry, render and historic stone with super-heated water at low pressure — gentle on the substrate, lethal to biological growth, dry in minutes.
The Moore & Franks approach
We're trained operators of the DOFF system and use it as our default on anything pre-war, listed, or where conservation officers are involved. The combination of temperature (up to 150°C at the surface) and low pressure removes paint, biological growth, bitumen and atmospheric soot without damaging the underlying stone.
It's our go-to for cathedrals, churches, listed cottages, heritage shopfronts and any property where 'soft wash' isn't conservative enough. The surface dries within minutes — so no prolonged dampness in old fabric.
A clear, repeatable process.
No surprises, no upsells. The same method every job — that's how you get the same result every time.
- 01
Site visit & permits
We confirm listed status, conservation consent and method statement before quoting.
- 02
Test patch
Discrete test patch agreed with you (and conservation officer if relevant) before main work.
- 03
DOFF cleaning
Stonehealth DOFF unit deployed across the agreed elevations.
- 04
Photographic record
Before/during/after photos for the file — useful if conservation reporting is required.
Frequently asked questions
Quick answers to the questions we get asked the most. If yours isn't here, drop us a line — we reply same day.
Yes — it's specifically designed for heritage and listed property work. We can liaise with your conservation officer and provide method statements as part of the quote.
DOFF uses temperature, not pressure. Output is around 1.5 bar at the nozzle — about a tenth of a domestic pressure washer — but the water is super-heated. The result is gentle on stone but lethal to algae, paint and bitumen.
Fixed price, in writing, guaranteedFree, no-obligation quote within 24 hours.
Send a couple of photos or book a site visit — fixed price in writing before any work starts.