Ventilation for roof space

Joined
9 Aug 2010
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Location
West Midlands
Country
United Kingdom
Hi

I am currently boarding out the loft and I am wondering aboutthe correctway to ventilate.

I have put laths attached to the sides of the rafters and then Thermaboard between the rafters for insulation giving me a 50mm airflow, then avapour barrier and finaly a plasterboard finish.

Between the rafters are bricks up to the tiles above the outside skin of the wall. There is no felt under the tiles.

My question is do I need additional ventilation or will the existing tile lay out give me the 25mm/ 5mm per metre gap (at eave and ridge respectively)

Any advice will be greatly recieved.

cheers
 
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