Method · Roof glazing
Conservatory roof cleaning
A conservatory roof is the one part of a house where the cleaning method is decided by what you must not do: load the roof. Panels and glazing bars are built to shed weather, not to carry a person or a leant ladder — so every method in this guide keeps your weight on the ground and your plan inside the reach of the tools you actually have.
Before you start
- Identify the roofing material (below) — it decides the chemistry and the pressure the surface tolerates.
- Measure the geometry: eaves height, roof depth, your setback — the pole reach planner tells you whether an entered pole covers it.
- Check the manufacturer’s care guidance for the conservatory or panels if you have it; it outranks this page.
- Plan water and time with the area calculator and time planner.
Identify the material first
| Material | How to recognise it | Cleaning temperament |
|---|---|---|
| Glass (usually self-cleaning coated on newer roofs) | Heavy, rigid, cold to the touch; check the original order or installer paperwork | Tolerant of soft washing; a coated surface must not meet abrasives or harsh chemistry — follow the coating manufacturer’s care sheet |
| Polycarbonate (multiwall) | Light, flexible, internal flutes visible edge-on, drums in rain | Scratches easily and clouds with solvents; soft brush, mild solution, generous rinse |
| Older acrylic or unknown sheet | Brittle look, yellowing, unknown provenance | Unknown tolerance — treat as fragile, test nothing on it, and keep to water and the softest tools, or stop |
If the material cannot be identified from the ground or from paperwork, the honest plan is to stop: unknown sheet plus enthusiasm is how roofs get scratched, clouded or holed.
The ground method
The working pattern is the outside-window method rotated over your head: rinse loose debris down the fall of the roof, wash with a soft pole-mounted brush and mild solution, then rinse thoroughly so nothing dries in the glazing bars. Work from the ridge-side down so dirty water crosses uncleaned panels, and keep the brush moving — a resting brush concentrates pressure on one spot of a surface you cannot inspect closely. Gutters first: a clean roof draining into a blocked gutter refills itself from the bottom.
Pole work overhead is more tiring than pole work on a wall, and the hazard list is the same one the HSE/FWC water-fed pole guide sets out — hoses underfoot, slips on wet paving, manual handling of a long lever, overhead electrical lines, weather.[HSE/FWC] Rest positions, shorter sessions and a controlled, excluded working area under the pole are part of the plan, not refinements to it. And the avoid-first rule that anchors this whole site applies with extra force here: HSE’s guidance is to avoid work at height where reasonably practicable — a conservatory roof is nobody’s place of work.[HSE]
What this guide does not cover
Pressure washing is out of scope for roof glazing on this site: the failure modes (driven water past seals, shattered or crazed panels, stripped coatings) are disproportionate to the time saved, and panel manufacturers’ care documents are where any exception would have to come from. Similarly, no chemical treatment for algae or lichen is recommended here — compatibility is a per-material, per-manufacturer question, and run-off goes into your garden.
When the ground method is not enough
Heavy moss at the ridge, a deep roof with a tall eaves line, an extension behind a narrow side return — some roofs defeat honest ground methods. That outcome is information, not failure: run the high-window access decision, which will either surface an inside/ground plan you had not considered or return “competent access planning required”. What it will never do is pick equipment for you.
Sources used on this sheet
- Health and Safety Executive / Federation of Window Cleaners — Safety in window cleaning using water-fed pole systems · Best-practice guide, amended 2026-03-31 · Accessed 2026-08-20
- Health and Safety Executive — Working at height whilst window cleaning · Publication date not stated · Accessed 2026-08-20
- Health and Safety Executive — Work at height · Publication date not stated · Accessed 2026-08-20
Correction and version note: written for content contract 2026-08-20.2; sources accessed 2026-08-20. Corrections are recorded on the methodology sheet.