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Suzan, I had the same problem, a conservatory that was impossibly hot when the sun came out, we had to rush to open the windows and doors, it was so hot we couldn't be in the room, when it rained the noise was incredible..... and we have a lot of rain.
Solution, fitted a solid roof with 8 inches of polyurethane foam between and below the joists, oriented t&g glued strand board, covered with geotextile material topped by a Firestone rubber one piece roof and one to two inches of pea gravel.
Result, all year round use, heating costs below half, total silence when its pouring with rain, heaven..
I am very interested in your post can you give me a bit more detail eg how much warmer is it after the work, what size conservatory do you have, which region of the country are you in and any other info that would help?
It's been a while since your comment but I hope this helps someone. We had the same problem with our old plastic conservatory roof. Got too hot in the summer so we couldn't chill out and relax, and it was so so cold in the winter so we couldn't go in then either. We got had a new glass roof fitted by this company called refresh glass roofs last September. Amazing. I know we didnt have much of a summer last year but it was nice to go into when it did get warm. we couldnt be any happier with it now though, since it has been so cold. So nice and cosy! I hope this helps :)
Anyone have experience of 35mm Corotherm Heatguard Fivewall Polycarbonate or any other Polycarbonate solutions (such as polycool)? Primarily interested in reducing the heat in the summer.
Do these really reduce the heat significantly? If so - any view to how many degrees you could expect to reduce the temp by when compared to a normal polycarb roof?