Best way to insulate wall.

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Newly cavity wall with thermalite inner - I'd like to use insulated plasterboard for better insulation but also as there is a steel I beam face set in it. Due to other features (window reveals etc) I've got a total 40mm max from the wall surface to play with so that rules battens out, unless I just use std plasterboard and cut up insulation between the battens.

Any thoughts / suggestions as to which is best way, is there a proven way to fix insulated PB direct to the Therms?

Ta
 
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Assuming the cavity in the new wall is filled with the correct insulation bats then why bother?

The cost of insulated plasterboard against the extra heat retention you'll gain from it is unlikely to be worth it, just make sure all the internal perps are correctly filled, if not top them up with expanding foam then board the wall as normal with 12.5mm standard boards
 
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Newly cavity wall with thermalite inner - I'd like to use insulated plasterboard for better insulation but also as there is a steel I beam face set in it. Due to other features (window reveals etc) I've got a total 40mm max from the wall surface to play with so that rules battens out, unless I just use std plasterboard and cut up insulation between the battens.

Any thoughts / suggestions as to which is best way, is there a proven way to fix insulated PB direct to the Therms?

Ta
We try and avoid insulated plasterboards at all costs. Rubbish to use, rubbish to fix and rubbish in terms of future fixing to walls. If we do have to insulate internally, we prefer to use separates where possible, as it means you can stagger the joints. Helps prevent future cracking.
 
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Assuming the cavity in the new wall is filled with the correct insulation bats then why bother?

The cost of insulated plasterboard against the extra heat retention you'll gain from it is unlikely to be worth it, just make sure all the internal perps are correctly filled, if not top them up with expanding foam then board the wall as normal with 12.5mm standard boards
Yes, might be marginal but we are in an exposed area facing an estuary, it's a room with 3 external walls and then there is a fair amount of steel embedded / exposed in the walls so keen to reduce cold bridging. I don't mind the small additional costs for a few boards for peace of mind.
 
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We try and avoid insulated plasterboards at all costs. Rubbish to use, rubbish to fix and rubbish in terms of future fixing to walls. If we do have to insulate internally, we prefer to use separates where possible, as it means you can stagger the joints. Helps prevent future cracking.
Know what yer saying, but due to various aspects of the layout - if I can get a good method of fixing direct to the thermalites it will be a lot easier / straightforward than battening - its only 3 full boards on 2 of the walls so two joints each - the 3rd is even less, but then with numerous windows and the steel work etc the battening and insulating will be a pain and there will be no relevant areas where future fixing will be needed.
 

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