Is too much insulation bad???

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Hi

My builders have left the required floor level in my new conservatory 150mm short of where it should finish. At present the concrete slab is 350mm below finish floor level, I will be putting down 150mm insulation, under floor heating and then a 75-100mm screed, this will leave a 100mm left to finish floor..... Can I simply put an extra 100mm insulation down??? This would give me 250mm in celotex, I know it's over the top but I get this stuff for pennies. Would there be any future movement? My builders seem to thinks its fine?!!!
 
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The only problem can think of is if the insulation boards do not sit flat with the sub-floor thus creating a void and a weak spot, otherwise crack on.

Same old problem on this forum..... never any responses!!
What did you mean by this?
 
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