Mono pitched roof insulation question

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Hi all,

Where would you place insulation when building a mono pitched roof with 6x2 ceiling ties underneath? In other words not a vaulted roof, and additionally is it best practice nowdays to insulation under the joists, such as celotex pl4000??

Sorry if its a dumb question I can't seem to find the detail anyway.

Thanks in advance

Paul
 
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Cheers Woody, let me put it another way.

If I put 100mm celotex inbetween the joists, do I need an additional 50mm below the joists???

Cheers

Paul
 
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Thanks Freddy,

Do I still need a vapour control barrier?
 
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