Floor insulation for conversion

[Jilly]

I've had to make a shed load (excuse the pun) of compromises because the permission is for conversion and it has to be exactly the same. I could think about doing a vaulted ceiling over the whole structure, but I'm caught in the trap of not being able to get costings without a clear idea of what I want, but I can't make those decisions without having some prices in front of me.. So I'm getting BC drawings done so that I can put out to tender .

[scottishjohn]

if using pir use £16 a sqm as a quide-all depends on thickness --a good starting point

[Russell griffiths]

Have you considered raising the ceiling joists, so instead of vaulted throughout you would have a sloping bit near the walls with a higher section in the middle. 

[Russell griffiths]

Can you do this. Look at option b. 

 

[Jilly]

Yes, we could, but the whole roof will have to come off. I will lo.ok into it once I have some prices

[PeterW]

1 minute ago, Jilly said:

Yes, we could, but the whole roof will have to come off. I will lo.ok into it once I have some prices

A vaulted ceiling would infer there are purlins or ridge beams already in place ..? If not, you will need to put these in place to support the roof at which point it is all coming off anyway. 
 

Do you have the as built drawings you can post or any photos of the inside as it may help people visualize what you’re trying to achieve ..?