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Urgent help needed re- insulating internal exterior walls

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Hi everyone

Well i got in trouble with building control as i didnt reaslise i needed to involve them when insulating the walls in our new office building (old house)

so far we've put 25mm celotex inbetween battens. We then planned to attach the plasterboard.

We we've been told to put more insulation to reach min u-value of 0.35

This is confusing me!

I have had a quote for Knauf thermal laminate plus but i cant work out what thickness i need.

For celotex 25mm with plasterboard attached it would be £28 a sheet

What other options would i have? all i have the in celotex brochure is the R value so how do i convert this to u value?

Please help as i need to order asap to prevent delays.
:money:

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