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Here is a picture of the empty room:



Next layers: 18mm plywood + 50x50mm wood studs:

Glasswool between studs, gyproc on top:

Bitumen+glasswool "deadsheet" comes next:

Finally, three layers of plywood+gyproc, glued together. They actually form a second "floating floor"on top of the first one, separated by the "deadsheet" membrane:

Here is the whole structure. Thickness of 200mm, 10mm higher than planned. Could not find 50mm stone wool slabs, used 3x20mm instead... Solid as a bunker floor :) :

Floor structure, from top to bottom:

- 2x18mm plywood (glued together)

- 13mm KNAUF Gyprock

- BITUVER Fonas 31 Bitumen Deadsheet

- 13mm  KNAUF Gyprock

- 50mm wood studs, ISOVER FDPL (23kg/m3 glasswool) inbetween

- 18mm plywood

- 60mm KNAUF 150kg/m3 stonewool floating floor slabs

So... what do we have here:

Two floating floors on top of one another. Plywood and gyprock provide mass (and I mean MASS ). Two types of "elastic" membranes to separate them - first is the stone wool, second is the bitumen "deadsheet", each with it's own insulation characteristics. Both target stopping the low and low-mid frequencies, clearly the most difficult to insulate ... Lighter glasswool between studs covers the mid- highrange frequencies (or at least is expected to ). The whole structure has a gap of 20mm to the existing walls, so no contact with walls whatsoever.

Any worries so far? At this stage mainly the stonewool slabs elasticity and possible deformations under the load of the future structure on top. Worked OK at the end, but you will see in the next episode that there was another issue I overlooked, which could eventually "shut down" the whole project.

Recap after Stage 2:

- in case you plan to buid such a cabin in an existing living space, beware: this is a really DIRTY and HEAVY job. I planned to do everything by myself, with the help of two co-workers for the load lifting and gypsumboard part. Ended up with 70-80% of the job done by myself indeed, but while sacrificing heavily time. Could work practically only in weekends.

- don't make my almost "fatal"mistake, which I will share in Episode 3 ...

--- END OF EPISODE 2 ---