Dubiously guessing blocking these attic vents will be ok?

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23 Nov 2021
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Hi,

I'm looking for advice.
We live in a converted farm Steading, built in 1830 with solid stone walls measuring 450-600mm with a pitched slate roof.

In the attic space there is an air gap between where the wall stops, roof rafters meet the wall and ceiling joists all come together.

This air gap in places is 2-3 inches wide (easily see daylight).
I would love to block up these air gaps not only for insulation reasons but I've get multiple wasps nests in the summer and continually get mice in the winter due to these gaps.

My understanding is that these air gaps are needed for roof ventilation. and should probably use a mesh over these gaps to prevent the pests but I was wondering about blocking these gaps completely with mineral wool or even expanding foam :eek:!!

At the same time I'm looking at upgrading my blanket loft insulation.

Our roof construction consists of slates nailed straight onto sarking boards (no liner inside or out) with gaps between very old sarking board so I'm dubiously speculating that these gaps would be enough to keep the roof space ventilated, condensation and damp free, or is this a terrible idea? Is there anything I could do safely to reduce the air flow and prevent the pests gaining entry?

Many thanks and looking forward to hearing from you all.
 
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