Advice needed on dormer roof insulation

[stephenDIY]

Hello,
We have a bungalow with a dormer roof which has vented soffits (image attached) in cold weather the soffits allow cold air into the roof so the edges of the ceiling are colder and moisture condenses on these cold areas which leads to mould (image attached). I have recently fitted a loft hatch to allow access to the roof space and have seen that there is a membrane on the top side of the plaster board ceiling which seals the moisture in. There is insulation in the roof which has been pushed out to the roof which I assume prevents ventilation which the soffits are intended to provide.
My question is what can I do to prevent moisture condensation at the ceiling edges? Do I actually need ventilated soffits can I cover most of them with insulation and use something like this in a few sections

Roll Panel Vents | Manthorpe​

The Roll Panel Vents are designed to maintain a flow of air to the roof space from the eaves, thereby allowing the escape of built-up moisture. Made from a continuous single profile, the panel can be rolled out over several rafters to create a ventilated gap beneath the felt running the span of...
Any suggestions or ideas would be much appreciated.
Regards
Stephen

 

[RandomGrinch]

Do I actually need ventilated soffits can I cover most of them with insulation and use something like this in a few sections

Roll Panel Vents | Manthorpe​

Keep the soffit vents uncovered.
Covering them up could lead to some bigger problems in your roof structure, than a bit of mould on the ceiling.

Personally, I have used these:

Manthorpe 600mm Refurbishment Eaves Vents G645

The Refurbishment Eaves Panel Vents are designed to maintain a flow of air to the roof space from the eaves. Designed to be used in refurbishment situations and is fitted from inside the roof space to create a clear air gap between the loft insulation and felt, its flexible hinge enables it to...

mytradeproducts.com

They are far easier to cut to size and push into the eaves than the roll.
And then I stuffed as much insulation as I could, underneath them.

 

[stephenDIY]

Thanks for your advice I have ordered some of those roof vents (400mm) for 16 inch beams.

Regards

Stephen