my recording room construction plans. any good?

[jrp]

Hi!
The two drwings show the recording/practice room we are planing to build in our house.
It´s on the first floor, below is the living space of our drummer. No direct connection to other buildings, next house is about 10 meters away.
40 cm concrete floor, 40 cm brick walls, wood/metal roof.

Goals:
Soundproofing for during the day drumming/recording
decent acoustic
Budget around 3000 Euro for material (500sqm gypsum, 150 sqm mineral wool, wood)

We are able to do all the building and the floor is able to support the weight.

On the first picture you can see a general layout. A inner wall consiting of two layers of gypsum, mineral wool, two layers gypsum.
On two sides this is surrounded by the brick outside wall, on the remaining sides we want to use another outer wall made from one layer gypsum.
We plan to fill the space between inner and outer wall with mineral wool as well.
The door will be the same construction as the wall.

On the second pic you can see a detailed top fiew of the inner wall.
There is a small air space between the inner and outer wood bars holding the gypsum.
The roof is under wood bars that rest on the bars holding the inner layer of gypsum. The outside layer is not connected to the roof. Inside hight will be 230cm.

So far, what do you think?
the way i see it the roof is our weakest point in this.

[ritelec]

Interesting.

Not sure about the construction technique, but if you were going for non parallel surfaces as in fig.1 , aren't you still creating them with this layout?
Shouldn't one side start and be the opposite (actually the same) in/out of the other side?


Interesting.

[ritelec]

Not knowing, but maybe two continuous walls skewed in (or out). Or one in or out.

Recording Drums


Thanks for the link DanDan.

[ritelec]

Not to hijack,

There is the ??? rule of thumb 38% listening position.
Angled work surface ??? 6 degrees.

Is there a ??? rule of thumb in a measurement per foot (meter) linearly how far a wall should be brought in or out to not be parallel with the adjacent wall? (although even the littlest bump of difference would make them not parallel).

[gullfo]

you're probably better off making the inner isolation walls straight then adding angled slats or polys - across corners and along walls to break up the reflections. on the ceiling scattered absorption, or if you have the height, suspending polys or space couplers are nice. it will significantly simplify the construction and you can adjust the room response as needed without working around odd angles.

[jrp]

that sounds reasonable. yes a lot easier.
Still i guess it is a good idea to make the walls non parallel at some small degree.
what about the construction of the rooms wall?
Especially: should the outside part of the wall be connected to the roof? We are planning to use individual stands for the inner and outer layer of the wall to avoid transmission through solid connections.
If the outside part of the wall is connected to the roof than there is a solid connection. If it is not, then the wall is "open" at the top.

Next thing: i am planning 4 layers of 12.5mm gypsum.
Since there is no floating floor, would you expect the difference to be big if i was to use only three layers? Would save us 100sqm of boards...

[jhbrandt]

Originally Posted by gullfo

you're probably better off making the inner isolation walls straight then adding angled slats or polys - across corners and along walls to break up the reflections. on the ceiling scattered absorption, or if you have the height, suspending polys or space couplers are nice. it will significantly simplify the construction and you can adjust the room response as needed without working around odd angles.

+1 and

Cheers,
John

[gullfo]

i would just make the rooms straight-walled. use isolation sway braces as needed to stabilize the structure and put an isolation ceiling on the isolation walls so at least 2 parts of the room (walls and ceiling) are fully separated. a damped membrane floor inside to decouple the instruments and amps.

[jrp]

isulation ceiling on the isulation walls -
with isulation walls you mean the outer structure of the gypsum -wool - gypsum construction?
The problem we see is that the 16cm wood bars holding the roof will only be axessible from below. Roof hanging below them.
We plan to have those 16cm bars sitting on the bars that support the inner gypsum layer. like in the second drawing.
Problem is, that even if our roof has multiple layers it will still have to be hanging from those big 16cm bars. So the layers will not be completly seperated.

[jrp]

just found out what a sway brace is.
Do you mean to use them inside the wall to hold the inside and outside gypsum together?
We intended to support them each with seperate constructions.

Not sure if i understand.