Hi where do you buy them from? I dont see cart on page?Have a look at lignacite.co.uk They make specialised blocks.
Your bricklayer won't thank you for dense blocks up to ceiling- but generally mass is the king for reducing noise pollution in and out. If it is a small room you could even think about poured concrete walls- bit specialised when it comes to the shuttering etc but maybe worth a thought? (Prepared to be shot down in flames on that thought though )
LIke yr thinking. How would you do it- really sloppy concrete to make sure it dropped all the way to the bottom or do it x courses at a time? (Curious here)Hollow blocks springs to mind, pour concrete into them
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