Is plastisised deadsheet the same as sheetblock?

Posted: Sun Feb 05, 2006 5:45 pm

My copy of "Recording Studio Design" by Philip Newell arrived last week. In the first skim through, it really seems like he's into using "5kg/m2 plastisized deadsheet" material sandwiched between two layers of gypsum.

Here's a couple of products I've found:
NoiseStop Barrier Shield
SBM5 from Soundproofing Mat Co - UK

Soooo, is the Auralex Sheetbock product, here in the US, the equivilent? The online calculators I've found seem to concur that it is.

Any thoughts or comments on what Newell professes with the use of gypsum::deadsheet::gypsum::stud

Thanx,
Max

Posted: Tue Feb 14, 2006 11:28 am

Mass load vinyl (barium impregnated) McMaster-Carr p/n 54665T32
Scott Smile

Posted: Tue Feb 14, 2006 7:33 pm

Max,

What Philip Newell is fond of - and how Auralex suggests their SheetBlok be used - is called "constrained layer damping" or "CLD." Mass-loaded vinyl (MLV) is one of the most economical materials available for this use. SheetBlok, the MLV Auralex makes, will provide significant isolation improvement through CLD.

Also, if you're into the "DIY" thing, Mr. Newell also suggests the use of MLV in limp-mass absorbers. (I don't have my copy of Newell handy, otherwise I'd give you a page number.) I have implemented this concept, much like Mr. Newell shows - hanging sheets of MLV with mineral fiber on both sides - and it's a very effective LF absorber.

One more thing I will add since this is an Auralex forum: SheetBlok is not a PVC like many of its competitors - it is an EVA. This means it will not interact with adhesives. PVC will break down adhesives over time. I.e., absorbers like those described above and in Mr. Newell's book would eventually fall apart. Not good. Since SheetBlok won't break down adhesives, your absorbers won't fall apart.

So, to summarize:

For high STL (and STC), use EVA MLV for CLD.
If you're a DIYer and you'd like improved LF in your CR, use EVA MLV between pieces of MF or FG.

OK?

Very Happy

Posted: Mon Feb 20, 2006 9:09 pm

lovecow wrote:

Max,

What Philip Newell is fond of -<snip happens>

So, to summarize:

For high STL (and STC), use EVA MLV for CLD.
If you're a DIYer and you'd like improved LF in your CR, use EVA MLV between pieces of MF or FG.

OK?

Very Happy

"OK?"... Hell yeah that's OK!!

(Un)Fortunately, I have to do the majority of my build DIY...

OK, lemme throw this one your way...

My R-n-R design interior wall system is 2x6 (16"OC). FG fill. Any idea as to this construction:
1. Stud (FG filled Cavity - duh)
2. 3/4" MDF
3. 1/2" Gypsum
4. Sheetblok
5. 1/2" Gypsum

Sooooo, 1/2" gypsum or 5/8" gypsum?
Loose the MDF for 2 additional layers of gypsum? (although from reading Paul Woodlock's build, it seems like the best bank for the buck.)

Thanx,
Max

Posted: Fri Feb 24, 2006 6:49 pm

Max,

Since this is the Auralex group, I would encourage you to contact the mod, Gavin. He has tools at his disposal that will allow him to guesstimate the isolation you'll get, as well as what the best approach would be - both acoustically and economically.

Posted: Thu May 11, 2006 9:25 am

Get rid of MDF and use Auralex 'Z' channel isolators. Use (1) layer of 5/8" sheetrock, (1) layer Sheetblock, (1) layer 1/2" sheetrock.
Scott
i.e. for the record I've been there and done it.

Posted: Sun Sep 03, 2006 5:31 pm

sheetblock... or whatever it's called is as close to useless as any product can be. It's got a great stc rating by itself... BUT it's not cumulative.

For example... it's got an STC of, let's say 22 //.. and a sheetrock wall has an STC of 35 or so... if you put sheetblock up in a sheetrock wall you're going to have a wall with an stc of 35. MAYBE 36. no better.

Go to www.greengluecompany.com and browse through the tech section. tons of great info on improving sound-proofing techniques. and testing data on tons of materials and products.

and be careful with that Z channel or Hat channel... You'll get a triple leaf effect and some really bad resonance from the wall iteslf. I've got the mother of all resonant walls at my space. so bad that i had to move my mix position to a much more inert wall.

good luck!

zack

Posted: Mon Sep 04, 2006 8:43 pm

Thanks for sharing your opinions, zack.

FYI:

• According to Auralex, SheetBlok has a STC rating of 27.

• SheetBlok would add more to the STC than you think. This is because, similar to some of the newer visco-elastic (VE) materials on the market, SheetBlok offers a certain amount of constrained layer damping (CLD). There are some neat samples with STCs and audio here. But, of course, you can get to diminishing returns. E.g., you would gain less by adding SheetBlok to an already substantial double wall construction.

• It's difficult to get triple-leaf resonances with resilient or "hat" channel unless it's been installed or applied incorrectly. You will get resonance from the wall, but no better/worse than without in most situations. In fact, the added absorptive effect this adds can be beneficial in many cases.

I would also like to add that, IMO, the folks at Audo Alloy make good products and their science is sound. The same goes for Quiet Solution.

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