[Mark Siddall]

David,
Apart from the survey that I have presented?

The conclusion of the report is that these people *do* value energy efficiency. So I'm not sure why your suggesting that the report suggests that they aren't interested. Have you seen surveys that suggest an even greater value has been attached to energy efficiency? Is so, please could you point me to such reports.

Mark

[Mark Siddall]

Geoff,
I'm not saying that energy efficiency is the clincher (first and foremost people want a nice home). But is that nice home is more comfortable because of x, y, z then it is the comfort aspect that could add a little to the bottom line value.

An Armani suit vs. Primark suit.

Mark

[Mark Siddall]

Yeah, thanks Nick. I'll arrange an email to the groups to let them know.

Mark

[Mark Siddall]

Will the orientation of the insulation play an important part in the degradation of an insulation?
Will roof insulation degrade more quickly that that in walls?
Which wall types offer the slowest rate of degradation i.e. cavity wall vs. fully supported (be it full fill cavity or full fill timber frame)?
Floors will always be problematic for insulation refurb…. information of the performance of load baring insulation vs. non-loadbearing would be ideal.

Mark

[Mark Siddall]

Zac,
When you join you get a free subscription to “Green Building Mag” this is very informative a for any eco-conscious builder. Subscribe now and I feel that it will help your development in any green career in construction.

Mark

[Mark Siddall]

First thought: So, does that mean that petro-chemical insulations, such neopor etc., are the way ahead until a bio-synthetic polymer insulation is developed? (Neopor uses less material to achieve it's performance than most other petro-chemical insulations due to a graphite compound within it.)

Initial thought aside petro-chemical insulations, placing concerns about ensuring that they zero-ODP and <3GWP to one side for a moment, do off gas and performance degrades and so are also susceptible to needing replacement also. So where does that leave us? All insulations degrade…

Next thought: The PHI tend to consider the whole life cost over 20 years, and work on the basis that the insulation will last for 50years. Considering the performance degradation of insulation, what is a realistic life span for insulations of various types (is it really the 50years PHI assume?)

The degradation of a given insulations performance will ultimately give any insulated building a shelf life as a consequence an insulation refurb will be required after X years. To minimise whole-life costs should U-values be calculated using “required performance life” data that considers the degradation of performance over time?

As an example, the “required performance life” is 50 years, if the performance of an insulation degrades by, say, 20% over this time frame, assuming a final performance requirement of U-value of 0.15W/m2, we could have:

0.15W/m2x 0.8 = 0.12W/m2 as the required installation U-value

Final thought: As insulation gets thicker the mass will increase. Will this cause the insulation to bed down, thus degrade, more quickly? Or is there a diminishing rate at which its performance reduces over time? (Surely the insulation materials can not degrade indefinitely. Once the initial bedding down period has taken place, I would expect, that a relatively stable density, thus performance, is achieved.)

Any comments?

Mark

[Mark Siddall]

No. Just the basic concept.

M

[Mark Siddall]

Okay, okay Nick.
But you haven't downloaded the September 25, 2007 Word document that that has a range of index solutions (including a drop down menu as the EAUC). I have my preferance, I never said that it was the only (or most generally agreeable) solution 😉

I agree with Tahir's comment about regional groups. Placing the calendar in a more obvious location would no doubts help access.

Mark

[Mark Siddall]

Page 7 shows the construction detail we discussed the other day. (No services in external leaf, double stud with plate rather than TGI. Does have a polythene membrane though.)

Mark

[Mark Siddall]

For more up to date discussion of energy and CO2 emissions see this thread:
https://aecb.net/forum/index.php?topic=1173.0

Mark

[Mark Siddall]

I'll come back to the friction coefficient and the impact on whole life energy consumption.

In terms of material use:
How recyclable are the ducts? (Re-use rather than recycle I get.) Doesn't the galv melt in the steel and create an alloy of lesser quality? (Not sure how the two metals are separated.)

Mark

[Mark Siddall]

An interesting precident showing how others are approaching “association” type web pages
http://www.eauc.org.uk/home

Mark

[Mark Siddall]

David,
Have you come across this Drakes Landing Solar Comunity?
http://dlsc.ca/reports/EPD_March_April_2007.pdf

Any thoughts about the two approaches?

Mark

[Mark Siddall]

I just realised that I hadn't included “campaigns” (I assume that this is still a live topic.) So I've just remove and replaced the up-loaded index.

Mark

[Mark Siddall]

Here, now that I've got my head around the menu system here are a few options. I still prefer the “long but informative” index rather than (just to be provokative) the “bitty flyout” index. Either way the new index is rationalised, duplications erased and more direct links to source data proposed (as per earlier up load).

Mark

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