Thread: Noise Reduction

[QUOTE=BobL;1967913]Exposed soft surfaces on the inside of a metal shop to absorb sound are tricky.

Unless good forced ventilation is used, exposed rock wool is just going to fill the shed up with fibres and every time the stuff is touched its going to come off in waves.
The recommendation when installing this stuff is to wear a P2 mask and that it will eventually end up trapped between two layers of something.

An easier way to deal with this in a workshop situation is by sound scattering. The air inside the shed is a pretty good absorber and will eventually absorb the sound but what is not desirable is to get all the sound waves from a sound source directly reflecting back your ears at the same time. Scattering the sound will reduce this effect substantially. To do this as many flat surfaces as possible have to be reduced or eliminated. If there are large areas of hard floors, they can be partially covered in rubber matting. Exposed flat sheet goods could be hidden behind machines. Flat walls could be textured with a foam or chunky paint. This is why Miniorb and even corro works as a liner.

The other way that works is to just fill your shed up with as much crap as possible.[/QUOT

you can get sealed rockwool for especially sound absorbtion. Its used in airconditioning ductwork etc to quiten noise from fan wheel and resulting air velocities etc etc

Yes lots of crap makes the wave bounce around thus quieting it.

Originally Posted by Satwinder Singh

Hi all just any suggestions for reducing the noise in garage specially for grinding and cutting of metal.
And what is the fastest way to grind metal mainly mild steel....


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Thanks a lot everyone for great suggestions.Glad i m in a forum with so much knowledge and experience


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If you wear good quality hearing protection you will not hear the neighbours complaining. Problem solved...

Reminds me of the 87 year old neighbour who came outside to give me an earful while I was moving my lawn with the old Victa.
I was wearing earmuffs and she came over to the side fence and gesticulated wildly for me to come over.
Thinking there was an emergency I ran over.
She looked mighty annoyed and yelled something at me but I could not understand her so I said sorry I can't hear you.
She shook her head and went back inside - then I realised I had my earmuffs on.
She never spoke to me after that.

BobL -- 87 year old. Possibly telling her to turn down her hearing aids??

But jokes aside, after watching stuff on telly over time, a lot of the acoustic rooms seem to have these "foam" shaped triangles facing inwards. So from my point of view, seems to support your line of thinking.

An easier way to deal with this in a workshop situation is by sound scattering.

To do this as many flat surfaces as possible have to be reduced or eliminated.

Ok these fancy triangles (apart from expense/fire issues) aren't a practical option for a shed, but no reasons why similar principles cant be employed.

so some corry/mini orb with some insulation behind would be a practical option I would seriously consider.

Another potential is 50mm cool room panelling. Ok doesn't have ribbing like orb, but after spending a couple of years working in cool rooms with 100mm panelling..... Good sound and temp insulation. Disad, cost and hanging heavy items off outer sheeting of.

Originally Posted by jatt

so some corry/mini orb with some insulation behind would be a practical option I would seriously consider.

Even better is perforated orb or corri'. The holes let a bit of the sound through. Behind a sealed/rigid steel sheet it is mainly the lower frequencies that get to the insulation. You want all frequencies to be dampened.


If you look at school halls, and the Covered Outdoor Learning Areas they build on the front, that is the cheapest way to quieten a large reflective surface. I have done the same in a church hall.

nigel --- its good sometimes on these theads where they pop up every so often. Another idea I haven't come across instead of the regular folks (at times me included) rehashing the same old stuff.

Yes I am a big believer of using the archives, often have to try under a few different search names before something I'm looking for presents itself.

I confess, I’m a bit obsessive with noise. When I build my shed I put a lot of effort into noise transmission - shed is lined with mdf and all walls (even internal) are insulated with R2 rock wool.

For absorption, I tried to use porous surfaces where possible. The ceiling is perforated custom orb (Lysaght) on 125 mm z purlins over R3.5 rock wool. I used a lot of pegboard in the walls as lining with rock wool behind.

During the lockdown, I finished the ‘outer’ part of the shed and used perforated white building film over 35x45 mm, battens on 450 Centers with Bunnings bamboo lattice to hold it in place.

I don’t get echoes and music sounds better than in my living room. Definitely well worth the effort up front.

Leigh










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Originally Posted by Ambrosia

I confess, I’m a bit obsessive with noise. When I build my shed I put a lot of effort into noise transmission - shed is lined with mdf and all walls (even internal) are insulated with R2 rock wool.

For absorption, I tried to use porous surfaces where possible. The ceiling is perforated custom orb (Lysaght) on 125 mm z purlins over R3.5 rock wool. I used a lot of pegboard in the walls as lining with rock wool behind.

During the lockdown, I finished the ‘outer’ part of the shed and used perforated white building film over 35x45 mm, battens on 450 Centers with Bunnings bamboo lattice to hold it in place.

I don’t get echoes and music sounds better than in my living room. Definitely well worth the effort up front.

Leigh










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Beauty.Looks Very nice and organised Garage


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Thanks. It’s a work in progress, but with the shutdown I’ve gotten a bit closer to how I want it.


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Originally Posted by BobL

Reminds me of the 87 year old neighbour who came outside to give me an earful while I was moving my lawn with the old Victa.
I was wearing earmuffs and she came over to the side fence and gesticulated wildly for me to come over.
Thinking there was an emergency I ran over.
She looked mighty annoyed and yelled something at me but I could not understand her so I said sorry I can't hear you.
She shook her head and went back inside - then I realised I had my earmuffs on.
She never spoke to me after that.

Haha


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