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We are doing a renovation of our ground floor bungalow which has an extension at the rear. The previous owner had extended it around six year ago. Our building took out a spotlight in the flat extension roof to find there was no insulation, he mentioned that although this seems like a warm roof, there can still be insulation under it and he is recommending to do it to improve overall insulation. Since it is part of a larger renovation, there is no significant incremental cost to it, so I have the following question: 1. Based on my limited research, there is not supposed to be insulation within joists, so is there any benefit in doing it? 2. it seems there could be condensation issues if this is not done right, then is there a way to do it which gives benefits without causing condensation issues Overall I will be open to doing something because the cost is negligible and if there is a chance to improve insulation I want to do it, however if it doesnt give any benefit or worse can cause condensation then I would skip.
