I would use plywood (birch faced) rather than MDF and run a router round the edges to give a 'V' joint between the boards as opposed to trying to hide the joints. Or I would look at planks (maybe plywood ripped) with acoustic cloth behind (see image of office designed by us) or a combination of the two.
Ooh what's this acoustic cloth?
I'd like to have a bit more sound proofing in our garden room.
Doesn't need to be totally treated as it's not for music. Just thinking about the neighbours really.
its just a standard black cloth material with a void behind filled with mineral wool behind. It would help with noise break out but its more for getting the reverberation time down if you have too many hard surfaces.
I would use plywood (birch faced) rather than MDF and run a router round the edges to give a 'V' joint between the boards as opposed to trying to hide the joints. Or I would look at planks (maybe plywood ripped) with acoustic cloth behind (see image of office designed by us) or a combination of the two.