Ceiling insulation

19 Sep 2017
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United Kingdom
Good morning.
I am looking to insulate my external garage.
The garage is a brick building about 3m x3.5m
The roof is a flat roof.
Joists at 600mm
The void is about 200mm
I was looking to lay some wool insulation but wondered if i need to leave a gap from the ceiling and a gap from the plasterboard?
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What is the ceiling made of? You wouldn't want a gap between the ceiling and insulation and you'd need a vcl (like a poly sheet) at ceiling level. You'd need a void above the insulation, Also you will need ventilation above the insulation to outside.

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