Garage Roof Condensation

8 Apr 2016
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United Kingdom
I am planning on converting my garage into a room, this is separate from the house at the other side of the garden
Not an 'official' room, just putting flooring down, plastered walls etc. The roof is corrugated sheet material and in winter I've noticed condensation on it with wet patches on the floor

Is the best way to create a false celling below the sheets, attached to the joists and RSJ's and then between the two put wool insulation. Would that prevent any condensation?
There is gaps where the sheets meet the walls so air circulation between the two should be ok

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