What type of Rockwool to use for Bass Traps?

[mukiw]

i got myself some rw45. to be honest, i was pretty disappointed by how floppy it was. nevertheless, it seems that it's definitely one of the better insulations to use for absorption.

i'm not allowed to get rigid fibreglass, as nobody else i'm working with trusts it.



anyone got any suggestions on what's the best thing to use to cut it for superchunks? i'm thinking a hand saw will do the trick.

[DanDan]

Yes, floppy can be very disappointing :-)

A serrated bread knife works very well. Try to get a big one :-) with equal serrations on both sides of the cutting edge.
The Comparative Safety of Rockwool, Fiberglass, and Organic Fibers (a review)

DD

[mukiw]

Originally Posted by DanDan

Yes, floppy can be very disappointing :-)



DD

lol

i have another quick question (i don't want to hijack the thread).

my partner wants me to cover the bass traps in two layers of fabric (because they are sleeping in the room, they are paranoid about breathing rock wool fibres/itchy skin ect). if i cover them in 1 layer of muslin followed by one layer of felt (or something to that effect), is it going to make any negative differences to my sound absorption?

[Steab]

Originally Posted by mukiw

lol

i have another quick question (i don't want to hijack the thread).

my partner wants me to cover the bass traps in two layers of fabric (because they are sleeping in the room, they are paranoid about breathing rock wool fibres/itchy skin ect). if i cover them in 1 layer of muslin followed by one layer of felt (or something to that effect), is it going to make any negative differences to my sound absorption?

Depends on the thickness of the fabrics, but it could only make a negative difference to your mid/higher range absorption.
I regretted covering an older basstrap with 2 layers of thick fabric, I had the same fear, u gotta explain him it'll be fine for his health with 1 layer.

[mukiw]

Originally Posted by Steab

Depends on the thickness of the fabrics, but it could only make a negative difference to your mid/higher range absorption.
I regretted covering an older basstrap with 2 layers of thick fabric, I had the same fear, u gotta explain him it'll be fine for his health with 1 layer.

thanks. i'll suggest to him that we do 2 layers for the cornered super chunks, but we'll do all the wall/ceiling acoustic panels with just 1 layer.

[PaulP]

Originally Posted by mukiw

i'll suggest to him that we do 2 layers for the cornered super chunks, but we'll do all the wall/ceiling acoustic panels with just 1 layer.

If I was going to worry I'd worry about the ceiling more than anywhere else.

Paul P

[johndykstra]

Use a single layer of cotton batting under your fabric. It's a very loose weave, and will provide no amount of acoustic anomolies, but it will be a course grade filter to prevent fibers from reaching the fabric. Not only that, but it will even out any uneveness of the insulation, and provide a much better looking trap.

[circuitbreaker]

Hi, I have been reading this thread with great interest as I am about to make some 15" x 20" square corner bass traps using ikea shelving units.

I see 'pink fluffy' insulation is recommended for this type of use, but would i also be able to use 'rockwool roll' - i have been unable to find the density of this material so if anyone can help me out I would appreciate it

link to rockwool roll:

Rockwool Roll | Loft Insulation | SIG Sustainable Solutions | Building sustainable futures

would this be even more preferable to rwa45 in this size of bass trap?

regards,
James

[DanDan]

The Roll looks fine. The density is not really critical. Although I wouldn't waste money filling a deep trap with expensive dense rockwool. Be aware that your design will cover a large amount of the surface area of your absorption material, not brilliant.
Take a look over at studiotips - tips on studio design, acoustics, and wiring for lots of DIY ideas, particularly on corner absorbers.
DD