Can you drill a hole in the sheets to install a flue?

Onduline sheets are not classified to External S.AA fire rating as required in UK Building Regulations for some classes of structure. Onduline products have a class E fire rating, so it’s really down to the flue manufacturer to advise. If the shroud surrounding the chimney is protective enough to contain heat transfer than it should be fine to use our sheets, but it’s for the flue manufacturer to confirm.

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