U-Values – The reason your conservatory is unusable for most of the year
A 16mm polycarbonate roof has a U-value of approx. 2.6 Wm2K whilst 25mm is around 1.6 and 35mm is just 1.5. Current building regulations insist on a minimum U-value of 1.6. The lower, the U-Value, the better insulation properties of the material and the less heat you lose through it. Most conservatories are unusable for most of the year due to old glazing and double glazing which do not offer much insulation.
Thermotec panels have a u-value of 0.29 which is a massive 9x more efficient at retaining heat in winter and keeping it cool in the summer.
Polycarbonate tends to be available in three thicknesses – 16mm, 25mm & 35mm. This option is the cheapest available however, it still only has a lifespan of 10-15 years and can suffer from scratches, discolouration and attracts algae. Next to no thermal properties meaning your conservatory will still be too hot in summer, freezing cold in winter and very noise in bad weather.