Conservatory roof glossary
Solid conservatory roof terms, explained
A plain-English reference for the words you'll hear during a Smart-Roof survey, quote and installation.
- Polycarbonate roof
- A translucent multi-wall plastic roof commonly fitted to UK conservatories from the 1980s to early 2000s. Lightweight and cheap, but a poor insulator (U-value 1.8–3.0 W/m²K) that yellows, becomes brittle and amplifies rain noise.
- Solid conservatory roof
- An insulated, lightweight tiled roof system that replaces a polycarbonate or glass conservatory roof. Modern systems combine a structural frame, multi-layer insulation and composite tiles to reach U-values as low as 0.15 W/m²K.
- U-value
- A measure of how much heat passes through a building element, in watts per square metre per degree Kelvin (W/m²K). Lower is better. UK Building Regulations require a replacement conservatory roof to meet 0.18 W/m²K or better.
- Smart-Roof
- Shire Conservatories' branded solid roof conservatory replacement system: lightweight composite tiles over multi-layer insulation, fitted to existing conservatory frames in 4–7 days with full Building Regulations sign-off.
- Lightweight tiled roof
- A modern composite tile roof engineered to weigh roughly 40 kg/m² — about a third of traditional clay or slate — so it can be supported by an existing conservatory frame without major reinforcement.
- Dwarf wall
- The low brick wall on which a conservatory's frame and glazing sit. It typically rises 600–900 mm from the floor and provides the structural base that supports a new solid roof.
- Building Regulations
- Statutory minimum standards for the construction of buildings in England and Wales. Replacing a translucent conservatory roof with a solid roof is a notifiable change and must comply with Part L (thermal) and Part A (structure).
- LABC
- Local Authority Building Control — the council body that issues Building Regulations completion certificates for works such as a conservatory roof replacement.
- Permitted development
- Minor building works that do not require a full planning application. A like-for-like solid roof replacement on an existing conservatory normally falls under permitted development in England and Wales.
- Velux / roof window
- A factory-made, weather-tight roof window installed within the slope of a solid conservatory roof to bring in daylight and ventilation. Each unit typically adds £600–£900 to a Smart-Roof installation.
- Composite tile
- A lightweight roof tile manufactured from polymer-bonded mineral aggregates that mimics the look of slate or shingle. Used on solid conservatory roofs for low weight, long life and a wide colour palette.
- Thermal bridging
- A localised path of heat loss through a poorly insulated junction (for example where the roof meets the wall). Smart-Roof installations seal these junctions to prevent cold spots and condensation.
- Condensation
- Water that forms when warm, humid air meets a cold surface. Common in cold polycarbonate conservatories. An insulated solid roof keeps internal surfaces warm enough to stop condensation forming.
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