For a glass conservatory roof, there are a variety of glass options available:
Building regulations stipulate that you must have double glazing (as a minimum standard) in a conservatory.
Constructed in the same way as your house windows, the double glazed units have two panes of glass with a layer of Argon gas between.
Your double glazing should be a minimum rating of A, ideally A+ or A++ for triple glazed. Watch out for cheap conservatories using B rated standard glass.
Glass conservatory roofs are not easy to clean so incorporating self-cleaning glass makes life a lot easier by reducing maintenance.
The self-cleaning glass has an outer coating of titanium dioxide. This coating reacts with water molecules in the atmosphere to break down dirt on the surface of the glass, which then gets washed away by the rain.
If it doesn't rain, the moisture in the atmosphere turns into a film and slides down the glass by gravity and takes the dirt with it.
The coating can stop slightly less light coming through the window but otherwise looks the same as standard glass.
Solar gain from strong sunshine is the biggest problem for a glass roof as it creates a ‘greenhouse effect’.
Low-E glass has a reflective layer applied to the outside of the glass that can deflect up to 80% of the sun's heat. On the inside, the coating stops heat from escaping, creating a warmer space in winter and cooler in summer.
Ideal for conservatories that face south or south west.