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Hello, Looking for some advice with insulating a vaulted ceiling. The rafters are 100mm in thickness, with 2 vented roof tiles at the top. Is it as simple as insulating it with 100mm PIR board and then using insulated plaster board, or are there other layers that need building up, such as a vapour barrier etc? Many Thanks Joe

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.

Hi Can I put mineral wool between solid joists on a flat roof - see red on the graphic. TIA

Hi folks i'm doing a self build extension my drawings ask for kingspan kooltherm k7 to be placed between the ceiling ties and the same above to achieve a maximum u value of 0.11w/m2k. The floor asks 175mm kingspan kooltherm K3 maximum u value 0.15w/m2k. Is there any insulation experts on here who could suggest an alternative cheaper product to kingspan to achieve the u values thank you.

Hi. We have opened the ceiling in our living room which had previously the ceiling in 2.4m height, with a normal plasterboard and 10cm mineral/glass fibre mix. The outside noise was less, but still noticeable. We now want to use the full space of the pitched roof to create a vaulted ceiling. At the moment the rafters have been strengthened and extended to 20cm depth, from which we have left a 5cm void below the felt under the concrete tiles for air ration and added 15 cm celotex insulation. I understand that celotex is great for the heat insulation and that we overreach building specs with the 15 cm, but that it does not do much against outside noise. As we live on a very busy road we wonder what would be the best way to insulate now the roof sound wise the best / economical way? Our builder wants to put additional 2cm wooden batons now under the rafters to account for uneven areas, not filled with anything and attach the sound plasterboard to them? Will this work, or just create an sound problem? Currently I am looking into two different thickness sized acoustic boards, depending on what is available on the market currently. I read about mass loaded vinyl which is quite expensive, and which seems to be often recommended to add in-between the 2 soundboard plasterboards. And in addition I read about resilient bars, where I wonder if they are ok with the weight of two heavy soundboards, and in addition if they are actually helpful against street noise, as this is rather an airborne noise instead of ground-born, , or am I wrong? Or are they rather for ceilings where a room is used above, and so not what I need? What would you recommend to keep out the road noise please? Kind regards Manfred