Mike,
I am a builder, I have seen and used ice and water shield products with and
without the granules. As explained by my roofer, the product with the
granules is typically used on a steeper roof or in wet conditions, so that a
roofer who steps on the product will not take a quick ride to the ground.
The non-granular stuff is pretty slick, especially with a bit of water or
snow on it. I would imagine that either would work about the same as sound
deadening, but  the smooth product may be better in a multi layered
application where one layer would have to stick to the one beneath.
YMMV,
Don
----- Original Message -----
From: "Mike" <mbucchino@CHARTER.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, January 16, 2011 1:34 PM
Subject: Re: Sound deadening and door speakers

> That's funny, it does have a granular surface and it says "Ice and water
> shield" right on the package.
> I installed 2 (yes 2!) rows of it before shingling my roof for extra
> coverage, but I still have around 100 lbs
> of it left to use on something else.  That roll is so heavy I loath having
> to move it for any reason.
>  So, in my shed it sits, until I need it someday (along with tons of other
> stuff, including old VW parts galore!).
>
> Mike B.
>
> -----Original Message-----
> From: Bill Glenn
> Sent: Sunday, January 16, 2011 1:32 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Sound deadening and door speakers
>
> On Sat, 15 Jan 2011 23:09:23 -0500, Mike <mbucchino@CHARTER.NET> wrote:
>
>>Sound deadening butyl is plain, but ice and water shield has gravel (like
>>asphalt shingles do) on top.
>>I have a bunch here from my home addition, but didn't try it due to this
>>fact.  It's heavy.
>
> Mike,
> If the product you used for your addition has a granular surface, it's not
> Ice & Water Shield, which is a specific trademarked product of W.R. Grace
> &
> Company, which I think was first to market with this type of roofing
> underlayment about thirty years ago; there are now other products on the
> market.  Using the term "ice and water shield" as a generic descriptor for
> any self-adhesive roofing underlayment could cause confusion because other
> products will likely have different properties.
>
> Ice & Water Shield is a cross-laminated, high-density polyethylene sheet
> backed with a rubberized asphaltic adhesive, and is a great product for
> its
> intended use as a roofing underlayment.  While it may look like some of
> the
> sticky-backed sound attenuation products, and utilize some ingredients
> from
> the same chemical families, the formulations are significantly different.
> That is not to say that it couldn't be used for sound attenuation, since
> adding mass in any form to, say, a door panel, would likely dampen
> vibration and thus reduce noise (or at least change the frequency).
>
> However, when deciding whether to use it inside your van, it may be
> instructive to note some of the manufacturer's stated limitations for the
> product when used for roofing underlayment:
> 1. "Due to its slight asphaltic odor, do not apply where the membrane is
> exposed to interior living space."
> 2. "Certain product applications are prohibited in hot desert
> areas in the southwestern United States."  I should think that the
> interior
> of a door or body section exposed to the hot summer sun, anywhere, would
> easily reach temperatures higher that those outdoors in the southwestern
> desert.
>
> Certainly there are those who have used Ice and Water Shield for sound
> attenuation without problem, however, if you do have a problem, be aware
> that it will likely be impossible to remove the stuff once applied and
> then
> baked on to the sheetmetal of your van.
>
> Also note that sound dampening only requires that a portion of an area be
> covered to dampen vibration, with a good result for the money spent. Sound
> insulation requires everything that can be covered be covered, at much
> greater expense relative to the smaller additional benefit, and a penaly
> in
> significant weight added to the vehicle (assuming the same sound
> attenuation material is being used).
>
> Bill
>
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