Ceiling almost done, time for the floor - more questions!!

[JohnGardner]

Guys,

Here's a quick sketch of my floors design.

It's pretty solid to walk on but as you can imagine also pretty "boomy". Stomping hard and running on this floor can be clearly heard outside the building as you would expect.

I need to upgrade this to keep up with my walls and ceiling which are about STC 45-50 I am guessing.

My walls are up already as you can all see in my project post (http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3743) and I don't really want to eat into my headroom to much by building a lightweight floating floor. Most the advise I have been given is that it's a waste of time unless it's really meaty anyway.

I have about 50mm to play with as that's the bottom jamb height of my door as it sits in the wall.

Possible ideas include:

(1) screwing and glueing down one or two more layers of 20mm chipboard flooring directly to the existing floor.

(2)adding a layer of 25mm rigid fibreglass and then screwing one layer of 20mm flooring through the fiberglass into the original floor.

(3) adding a layer of 6mm carpet underlay then screwing one layer of 20mm flooring through the fiberglass into the original floor.

(4) adding 10mm foam rubber and then screwing down one or two new layers of 20mm flooring.

I'm not isolation mad but I do need to do something to get isolation up near the walls and ceiling and help with possible flanking into the control room seeing they both share the same floor.

Just for the record I can't get under this floor to upgrade as it sits one foot above the ground.

Ideas would be appreciated and I just want to say thanks to everyone, I feal guilty about asking so many questions the whole time!!

[sharward]

I'm thinking the only thing you can do to decrease the boominess would be to add the layers of mass as you described in your first option. If I understand it correctly, the "boom" would still occur but at a lower frequency, and hopefully that lower frequency would be less audible.