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Hi all, I'm having an extension built, the plans show a 15 degree pitched roof, my builder says the tiles need minimum 17.5 but he would prefer to go to 20, this means the ridge height will encroach upon an upstairs window, he's suggested reducing the window size, which we can do but feels a bit drastic. I did some googling and found the Planum low-pitch interlocking tiles , which looks like they will do the job at 15 degrees, but he's not used these before so is a bit unsure. He spoke to some of his roofing mates but they're saying they've have had problems with them leaking even when fitted in accordance with manufacturers instructions. They are smaller than normal tiles, more expensive and more labour intensive to fit (requiring double-battens and taping everywhere). Has anyone got any experience using these tiles on a low pitch roof? It feels like for the sake of the extra cost and effort it would be simpler to just make the upstairs window smaller, it's only a spare room anyway so doesn't really matter if the window sill is a bit higher than normal, but I'm just checking our options. https://preview.redd.it/s2xrn5fxkm6h1.png?width=870&format=png&auto=webp&s=d8c5da627859d437038a863da39f8e1e68520b84
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