u/Entire_Initiative731

Hi all,

Looking for the best option for soundproofing/ insulating my ceiling/ floor between ground and first floor.

(Image is one I pulled off the internet not my place but shows different options).

Long story short, 200mm depth on floor joists, too broke to by Rockwool RWA45 slabs and double them to fill the whole void, would I be best going with:

Option A: 100mm Slab closest to the floorboards of the 1st level.

Or

Option B: 100mm Slab closest to the ceiling of the ground floor.

Or my 3rd option do I buy some cheaper acoustic roll (density of about 13kg/m³ 🥲) and double that up to fill the 200mm void completely?

Thanks all for your help and reading this far 🙏🏻