Cavity wall open to loft and melted frost on roof?

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I have a 1970's house with an old extension built 2 years after property to accommodate kitchen and bedroom.

I can see the cavity wall opening into the loft space and I wonder as this starts off in the kitchen, and would this be a problem causing condensation in the loft and if so how could/should I deal with it?

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Am seeing the following on my roof during cold mornings and condensation on GRP dry valley plywood. Insulation in the loft is 10 cm thick but in good condition as I replaced with new in this area. Have also sealed and insulated loft hatch as best I can and filled holes coming from boiler cupboard into loft space etc.

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When you replaced the insulation did you leave a gap in the eaves for airflow?

10cm insulation is not thick enough either....
 
Below is a copy and paste.

Your loft needs more insulation and as posted above. there MUST be a cross flow of air which means eaves vents, the vents in the eaves MUST be kept clear to allow [in effect] a breeze within your loft space

The Government say that you cut your energy bill by up to 20% through effectively insulating your loft. The recommended depth for loft insulation is 270 millimetres for glass wool, 250 millimetres for rock wool or 220 millimetres for cellulose.

Ken
 
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Thanks for the advice guys, the joists are small 45mm X 75mm every 40cm so its tough to sort this as part of the loft is boarded out as well.
 

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