[Bldg-sim] effective R-value cavity insulation

[Carol Gardner]

Dramatically higher or lower?

On Thu, Sep 16, 2010 at 9:35 PM, mark dewsbury <Mark.Dewsbury at utas.edu.au>wrote:

>  Dear Kevin,
>
>
>
> I am sure this is going to be a hot topic very soon.
>
> In Australia, the ASHRAE & other values have been used for some years with
> regard to cavity insulation values. This includes subfloors, walls, roof
> spaces and spaces between roofing and sarking. We have conducted a few
> preliminary studies with Engineering honours and Architecture PhD students
> on actual buildings. They have all shown dramatically different results to
> what was previously accepted. In the case of walls this has a dramatic
> affect on the current practice of placing the insulation on the outside of
> the cavity.
>
>
>
> In terms of the roof model we have documented variations up to 20 deg C
> between DSP and observed results. Subfloors having variations but to a
> lessor magnitude.
>
>
>
> We are hoping for some future moneys to go back to the fundamentals of the
> physics models and modify them to relate to what is really occurring in
> buildings. We have measured amazing horizontal and vertical air currents in
> cavity spaces dependent on wall orientation.
>
>
>
> Mark Dewsbury
>
> Centre for Sustainable Architecture with Wood
> School of Architecture
> University of Tasmania
> Locked Bag 1324
> Launceston 7250
> ph: 03 6324 4089
> mob: 0417 290 807
> fax: 03 6324 4088
> e: mark.dewsbury at utas.edu.au
>   ------------------------------
>
> *From:* Kevin Kyte [mailto:KKyte at watts-ae.com]
> *Sent:* Friday, 10 September 2010 1:47 AM
> *To:* mark dewsbury
> *Subject:* RE: [Bldg-sim] effective R-value cavity insulation
>
>
>
> This is what I received.
>
>
>
> *From:* mark dewsbury [mailto:Mark.Dewsbury at utas.edu.au]
> *Sent:* Sunday, September 05, 2010 9:36 PM
> *To:* Kevin Kyte
> *Subject:* FW: [Bldg-sim] effective R-value cavity insulation
>
>
>
> Dear Kevin,
>
>
>
> Was there any feedback or comment from your question?
>
> I have done some preliminary studies with engineering honours students and
> found dramatically different results to the theories.
>
>
>
> Mark Dewsbury
>
> Centre for Sustainable Architecture with Wood
> School of Architecture
> University of Tasmania
> Locked Bag 1324
> Launceston 7250
> ph: 03 6324 4089
> mob: 0417 290 807
> fax: 03 6324 4088
> e: mark.dewsbury at utas.edu.au
>   ------------------------------
>
> *From:* Kevin Kyte [mailto:KKyte at watts-ae.com]
> *Sent:* Sunday, 6 June 2010 2:13 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] effective R-value cavity insulation
>
>
>
> I am curious what the relationship is between cavity depth, rated
> insulation, and effective insulation in framed walls.  I am referencing the
> ASHRAE 90.1 doc because it is really the only one I have on this subject.  I
> have charted Table A9.2B and a logarithmic trendline appears to be a good
> fit for extrapolating.  If anyone in academia, industry, or the societies
> has more information on this subject I would certainly be grateful to
> receive a good lead.  Thank you.
>
>
>
> Kevin Kyte, LEED ® AP
>
> *Watts** Architecture & Engineering, P.C.*
>
> 95 Perry Street, Suite 300
>
> Buffalo, NY  14203
>
> p:  716.206.5174
>
> f.:  716.206.5199
>
> e:   kkyte at watts-ae.com
>
> http://www.watts-ae.com
>
>
>
>
>
>
>
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-- 
Carol Gardner PE
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