Help with build Regs Uk

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Can anyone help here please.
I've decided to do my own plans and have got through planning ok but have a couple of exceptions on building regs. Would appreciate any help.
We are building a flat roof extension to lounge about 4M square.

1.Ventilation.
a) method of acieving cross ventilation to flatroof void for a cold roof.
b)minimum 8000mm2 of background ventilation is reqd ??
clarify how reqd levels of ventilation are to be maintained in lounge.
2. preventing cold bridging at flat roof eaves.
3. Energy efficient lighting please specify type.
4. method of preventing cold bridging at masonry abutment between new and existing walls.

Thanks for help
 
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dont put a flat roof on you will only have problems later on, put a pitched roof on it, might cost a little more but it,ll be worth it......
 
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thats not a very helpful reply

the new flat roof blends in within an existing flat roof, which has been leak free with no maintenance for approx 35 years.

if the new flat roof gives this level of reliability then i'll be happy.

can any genuine knowledgable people help with my original questions
 
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Buy a recent copy of the Building Regs.Less than £20.
 

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