Sound insulation ceiling and floor separate joists ?

[StephenStephen]

I'm renovating a large room, below bedrooms above.
knackered ceiling is now down, most floor joists (above) need replacing.

I want to soundproof to cut down:
-noise from shouting, singing, swearing, etc from downstairs to upstairs

and it would be nice to reduce footfall, tv etc noise coming down from above.

I could use resilient bars, but I could just as easily hang the ceiling on separate joists, (fixed into the stone walls) between the floor joists above.

I could then use either soundblocker fleece: http://www.soundservice.co.uk/soundblocker-quilt-plus.html or thermafleece ultrawool: http://www.thermafleece.com/product/thermafleece-ultrawool going over the ceiling joists and under the floor joists (I reckon I can afford 50mm to weave below floor joists/above ceiling joists.

I'd then finish off either with plasterboard - not sure whether to go for 1 layer or 2 or thicker or soundblocking plasterboard.

So a couple of questions or three:

Am I right in thinking that, from a sound reduction point of view, it's better to have separate floor & ceiling joists than resilient bars?

Anyone got any views on relative effectiveness of soundblocker vs thermafleece ?

Plasterboard - one layer or 2 or use soundblocking plasterboard?

Thanks for your thoughts,
Cheers
Stephen

 

[skenk]

there's a resilient strip around the edge of a resilient bar ceiling whereas your 2nd set of joists will be mechanically fixed to the same walls/structure as the 1st set of joists so that is a route for transmitted sound. I wouldn't assume your 2nd joist plan will be better than properly installed resilient bar.

Look at the density of each quilt (kg/m3) to get a meaningful comparison