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Blocking up builders opening left by fireplace

JamesAsus said:
Do you think ill be okay damp wise by just fixing some DPM to the single skin wall and then filling with rockwool?

Its down a side alley and next doors side alley is next to it, so doesent really get any direct rainfall, and obviously its not a chimney.
Click to expand...
I expect so but I would try to seal the edges to the existing at least along the top and sides.
 

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