Trying to Quieten the 110KVA Generator

The Craftmans Shop > New from Old

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nrml:
Some interesting experiments on sound absorption.

awemawson:
Some interesting points raised in that video, thank you.

It reinforces my opinion that lining the walls and ceiling with rock wool cavity batts is the way forward if only I can find a job lot at an affordable price, they don’t need to be as thick as a standard 100 mm batt, probably 25 mm would quite adequate, but it’s not practical to split them. Rock wool by the roll is of course available but mounting it brings more issues.

awemawson:
At last I've sourced a load of Rockwool Acoustic insulation in 25 mm thick slabs - supposedly 'semi-rigid' - we'll see if it is or not when fixing!

Fixing to three different types of substrate:

Steel partition - self drilling screws

Timber cladding - 2" No 10 wood screws

Concrete Blocks - 50 mm x 5 mm 'hammer fixings'

All using 60 mm nylon washers. No doubt this is going to be one of those 'fun jubs' !

awemawson:
I thought that I'd experiment fixing a slab to the partition wall, in the end it went so well I actually got nine fixed before I was called away to rescue the wife from the puppy :bugeye:

Initial marking out was a pain then I hit on the idea of making a jig - speeded things up considerably.

Then starting the self drilling screws wasn't easy - they wander as of course the point is the wrong side of 25 mm of soft insulation - they need centre punching, but you'll never find the centre pop through the insulation :bang:

Simple solution, clout the screw with a hammer and carry on screwing - went like a dream.

. . . so nine sheets done out of a total of 96 so about 10% - but it's the easy 10% I reckon.

Too early for noise tests as guests are present and anyway much more probably needs doing before the effect will be noticeable though I can tell it's already less echo-y.

tom osselton:
Looking good that will help out a fare bit.

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