need some advice on soundproofing

[tonyton]

hello, i m going to add second walls and ceiling (not floating floor) for a room that i have, i will be playing drums and recording there. i can afford one of these two structures shown in the drawing....either 1 layer of rockwool and 1 layer of 1/2'' gypsum board... or 2 layers of 1/2 gypsum board. What do you guys think would be a better thing to do in terms of soundproofing? A or B? thanks

.....ooops! sory i ment 1/2'' plasterboard on the drawing!

 

[pandamonk]

hello, i m going to add second walls and ceiling (not floating floor) for a room that i have, i will be playing drums and recording there. i can afford one of these two structures shown in the drawing....either 1 layer of rockwool and 1 layer of 1/2'' gypsum board... or 2 layers of 1/2 gypsum board. What do you guys think would be a better thing to do in terms of soundproofing? A or B? thanks

.....ooops! sory i ment 1/2'' plasterboard on the drawing!

With brick and plasterboard, insulation doesn't make much difference. Although for thermal, insulation is preferred. You really don't need rockwool behind the walls, standard insulation would do fine. Rockwool, etc is for acoustic treatment inside the room.

Anyway, B would be the better option for sound isolation.

 

[Rod Gervais]

With brick and plasterboard, insulation doesn't make much difference.

Panda,

you're mistaken.

Insulation makes a large difference regardless of the remaining structure.

You are (however) correct that the higher density rock wool is not necessary - in fact 0 you get better LF isolation with the lighter fluffy fiberglass insulation.

Rod

 

[Rod Gervais]

hello, i m going to add second walls and ceiling (not floating floor) for a room that i have, i will be playing drums and recording there. i can afford one of these two structures shown in the drawing....either 1 layer of rockwool and 1 layer of 1/2'' gypsum board... or 2 layers of 1/2 gypsum board. What do you guys think would be a better thing to do in terms of soundproofing? A or B? thanks

.....ooops! sory i ment 1/2'' plasterboard on the drawing!

Tony,

everything is dependent on everything else - in order to make any reccomendation you really need to develope a section through the building detailing existing conditions and what you are doing.

That having been said - unless you play real REAL quietly - neither of those designs is going to isolate a whole lot of drums.

Nothing unusual seeing drums measure in the 110 dB range.

Rod

 

[tonyton]

Tony,

everything is dependent on everything else - in order to make any reccomendation you really need to develope a section through the building detailing existing conditions and what you are doing.

That having been said - unless you play real REAL quietly - neither of those designs is going to isolate a whole lot of drums.

Nothing unusual seeing drums measure in the 110 dB range.

Rod

ok this is what my house looks like, its on the ground flour, and the only neighbours i might disturb are on the 1st flour of the same building. all walls are concrete and bricks and all floors and ceilings are concrete. There is a loft above the room, so there is no direct connection with the 1st floor. so basicaly what i m trying to do is reduce sound transmiting through the walls to the house above. Am i on the correct path so far?? thanks for the replies!

 

[pandamonk]

Panda,

you're mistaken.

Insulation makes a large difference regardless of the remaining structure.

You are (however) correct that the higher density rock wool is not necessary - in fact 0 you get better LF isolation with the lighter fluffy fiberglass insulation.

Rod

Sorry Rod. I'm just going by all the tests I've seen, such as the SAE STC Chart.
BRICK VENEER:
No Insulation 53
With Insulation 55

It doesn't make as much a difference as it would in a stud wall.

 

[Rod Gervais]

Sorry Rod. I'm just going by all the tests I've seen, such as the SAE STC Chart.
BRICK VENEER:
No Insulation 53
With Insulation 55

It doesn't make as much a difference as it would in a stud wall.

Maybe not much of a gain from your perspective (although an STC chart doesn't take into account the lower frequencies since it is designed to deal with the frequency range of the human voice and that is one of the gains with fluffy insulation).

But beginning from where they are now - if you were to add an additional brick wall and then another layer of drywall you would acheive about a 5dB increase in isolation (6dB if eveything was perfect)

Big bucks that above - but it is almost double the isolation as a whole.

Now - let's see - for some cheap fluffy insulation (only pennies of the cost in comparison) we can acheive a reduction of slightly more than 1/3 of that.......... I would say that it was a HUGE gain for cheap money. And in most of the Low Frequency range it would be closer to 1/2 of it - think about that - reducing an additional 33 to 50% (to what all that mass already gave you) by simply stuffing some fluffy insulation into the wall cavity.

That isn't just huge - it amazingly huge............. you just have to keep remembering that every 6dB is a doubling of amplitude and cutting the noise getting thorough in 1/2 for isolation.

Also - you have to remember that this is a weighted average - some frequencies could be 10dB or more - and still average out to 2 to 3dB overall.

Think about it.

Sincerely,

Rod