Started new project today, I have an outhouse that I am converting to a utility room. Steel support went up today and should be knocking walls out tomorrow but once this is done I am going to dot n dab walls after electrician has been in. My walls are doubled brick except the joining wall that I share with the neighbours outhouse. Now do I board it with insulated board or will it be fine without? only asking cos with it being a single brick wall the sound is heard from the other side so this leaves me wondering if I should Soundbloc it? kind of would like to reduce sound and insulation but not sure which to do. Opinions????