Hello, I'm having the ground floor kitchen/diner of my 5 year old new build totally rebuilt because it needs a cavity/drain system (another story). In the process the dot and dab will be removed. Although my house is end terraced, the block is staggered so the walls of the kitchen/diner are all either internal or external. However despite nobody being directly on the other side of the wall I notice a lot of flanking sound (voices mostly) travelling behind the dot and dab along the party wall and then into my kitchen/diner. I would like to be able to watch movies and play music in this room without the sound travelling behind the dot and dab across the party wall. So, I have an opportunity to replace it with something else, but I'm not sure what? would battening out from the bare block wall, insulating with rockwool and then acoustic plasterboard be worth it? A cheaper option that occurs to me, since the sound isn't coming directly through the wall, but across it, is just sealing up the edges of the dot and dabbed board properly with either foam or a continuous line of the the dab cement like they're supposed to do but apparently don't.Thoughts?