[Greenbuilding] Thin High R-value insulation for exterior

[JOHN SALMEN]

I used rockboard (to avoid foam) but was not happy with it. Its compressive
strength is achieved using urea formaldehyde as a binder/glue. Higher
stiffness - more chemicals - nasty stuff to work with. The density is rated
for the whole board but seems inconsistent - you can poke your finger
through it. For fastening you have to use a pretty big washer (one company
makes one up to 3") so it is doable.

Rockwool board has been used as a base for stucco with metal lathing since
the 40's. With a lime stucco I would have some concerns about the stiffness
of the rockwool without a rigid lathing - I think it would be more prone to
cracking but in this case it is not a cladding so much as a decorative
coating over the insul board (which is the cladding). Might want to look at
an earthen plaster.



JOHN SALMEN ENVIRONMENTAL DESIGN
4465 UPHILL RD,. DUNCAN, B.C.  CANADA, V9L 6M7
PH 250 748 7672 FAX 250 748 7612 CELL 250 246 8541
terrain at shaw.ca


-----Original Message-----
From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of
josephbecker at riseup.net
Sent: October 30, 2010 8:13 AM
To: Lynelle Hamilton
Cc: Greenbuilding
Subject: Re: [Greenbuilding] Thin High R-value insulation for exterior

I like the idea.  I am planning a similar assembly using 3" of a stiff
Rock Wool product (Rock Board 80) over Faswall. It is not stiffer then EPS
however I am only planning a 1/2 lime stucco over it and I want to
maintain a permeable wall system and avoid using foam.

Any thoughts or ideas would be helpful

Best Energy,

Joseph Becker
www.IONecobuilding.org
www.HomeEmpowerment.org
360 534 4717


> Hi Mike:
>
> They use screws at various points in the wall now to do this.  None
> wants to install a brick ledge, saying it won't work well for the stone.
>
> Thanks!
>
> Lynelle
>
> On 30/10/2010 09:41, Michael O'Brien wrote:
>> Hi, Lynelle--
>>
>> Hmmm...a brick veneer would normally sit on a ledge, like a metal
>> bracket, attached to the structure. Is there some way the stone could be
>> supported like that?
>>
>> Best,
>>
>> Mike O'Brien
>>
>> On Oct 30, 2010, at 6:28 AM, Lynelle Hamilton wrote:
>>
>>> Hi All:
>>>
>>> Again, I turn to this list for advice.
>>>
>>> My house is durisol block, but I want to add 12-15R insulation to the
>>> exterior, in part to reduce heat loss from the webs of the block, and
>>> partially because I want R40-R43 walls.
>>>
>>> I have reclaimed 3" SM Board (blue EPS)  to put on the outside of the
>>> durisol.
>>>
>>> The facing is manufactured stone.  I have had 3 masons look at the
>>> property.  One mason says no problem attaching the stone to the durisol
>>> through the 3" EPS, the other two say well.,....can't you find
>>> something else?   They point to the possibility that the screws needed
>>> will bend in the EPS, allowing the block to sag.
>>>
>>> Both say spray on closed cell insulation provides too uneven a surface
>>> to attach lath and stone.
>>>
>>> So, has anyone done what I'm doing? What was the result? Alternately,
>>> does anyone know of anything with grater rigidity than the EPS, perhaps
>>> with higher R-value per inch, that would work?
>>>
>>> Please don't point me to the engineer....he says this is out of his
>>> scope.
>>>
>>> Many, many thanks!
>>>
>>> Lynelle
>>> --
>>> Effective immediately, please use the following e-mail address to reach
>>> me: lynelle at lahamilton.com
>>>
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>>
>
> --
> Effective immediately, please use the following e-mail address to reach
> me: lynelle at lahamilton.com
>
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'



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