Some help on roof insulation please

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9 Jun 2011
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Location
Bedfordshire
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United Kingdom
We are having a considerable work carried out on our house. Prior to the work starting we lived in the house and it was incredibly cold so it is so important that we get the insulation right. We have great builders but I have found out that they have done the following:

instead of using 100mm insulation quilt in the roof space they have used "100mm sound insulation". Is sound insulation as good as insulation quilt.?

Also I have quite a concern on what they have done when retiling the roof. The underside of the roof had exposed joists in the room and plasterboard was between the joists. From the outside in the roofers have put: Tile, breathable membrance, 45mm fibreglass insulations. Under this is the original plasterboard(which is in the room as noted above) 100mm celotex has then been added under the original plasterboard then new plasterboard added on top of the celotex. Is this likely to cause a problem with condensation - is this what is called a hybrid roof?

Any help/advice you can offer is much appreciated. :D
 
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Yup, from what I remember that is a hybrid roof.

As long as there is a vapour control layer between the plasterboard and the insulation that should keep the condensation away.

Hopefully there is a counter-batten or a gap from the top of the rafter to the face of the upper insulation to allow drape of the underlay or if the underlay is laid directly over the rafters with insulation flush, a counter-batten to do the same

Your local BCO should have been consulted at the initial stage, they would then make their recommendations and will issue a certificate on completion
 
instead of using 100mm insulation quilt in the roof space they have used "100mm sound insulation". Is sound insulation as good as insulation quilt.?
Not sure about your hybrid roof ( :confused: ) but your loft insulation should be about 300mm thick to satisfy current reg's.
 
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instead of using 100mm insulation quilt in the roof space they have used "100mm sound insulation". Is sound insulation as good as insulation quilt.?
Not sure about your hybrid roof ( :confused: ) but your loft insulation should be about 300mm thick to satisfy current reg's.
Yes I don't understand where they have used what insulation. Is there a room in the roof? The threads' not at all clear.
 

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