Loft insulation with rigid material

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30 Dec 2005
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United Kingdom
The ceiling of the top floor of our house is made with wooden beams about 50cm apart and tongue and grooved timber nailed on top. This gives a flat floor in the loft, (the rafters are underneath) but there is no insulation at all.
I want to lay rigid insulation material directly on top of the loft floor; 2 layers, done in a way so that the joints between each sheet of the bottom layer is covered by the top layer. I will seal with some sort of foam, around the edge of floor/ceiling as at the moment you can see daylight from downstairs.
Should I cover this insulation with any sort of plywood material ? Has anybody used a similar method or been in a similar situation?
 
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