studwork on drylined wall

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Hi All,

planning a kitchen extension in semi detached house. The side wall will be extended with new cavity walls (30cm thick), but the current side wall is solid twin brick wall (22cm or so). A chimney hearth was previously removed, leaving a recessed opening. That was plyboarded up. The rest of the plaster was stripped off and dry lined. Once the extension is done, there will be a 7-8cm difference in depth. So is it OK to add new studwork on top of the dry lining, or is it best to remove the it and put studwork direct onto the original brickwork ? The boiler will be relocated to this part of the wall as well as kitchen units.

Thanks in advance
 
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Pulling the old off would be best but you will then have to insulate that wall to refurb standards. Is the existing drylining dot and dab or battened? If its battened job becomes a 50/50- you'll get a decent fix and you won't be required to insulate by bco. If dot and dab best pull it off and start again
Refurb wall insulation standard is achievable with 70 or 80mm of Celotex type stuff. Given the current cost of it and the boiler plan I'd look to using 120mm of rockwool instead (if you have the room).
 
Thanks OBND, it was dot and dab.
What should go on top of the stud timbers (to support units /boiler)? 18mm ply then plasterboard. Is it advisable to put additional noggins when the screws of the units / boiler will go?
 
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