Ok so i asked the building control officer what insulation to put between my party walls 
 
	Im dividing an 18m×12m portal frame barn into 3 houses 
 
	He advised me to employ an acoustic company to advise
 
	Surely theres some format to this . I am using cavity wall blockwork 
 
	So what can i do other than use the acoustic slab wool insulation then maybe some special noise proofing plaster on these walls after
 
	Help!!@