[Greenbuilding] insulating on sheathed roof

[Bob Korves]

----- Original Message ----- 
From: "Robert Tom" <ArchiLogic at yahoo.ca>
To: <greenbuilding at listserv.repp.org>
Sent: Thursday, January 03, 2008 12:46 PM
Subject: Re: [Greenbuilding] insulating on sheathed roof
(snip)
> Glass wool insulation is third from the bottom in the table, with average
> air flow (Q-avg) listed as being 36.7327 L/s-m^2 @75 Pa.
>
> Cellulose insulation (spray on) was last in the table, just below
> vermiculite, with Q-avg listed as being 86.9457 L/s-m^2 @75 Pa.
(snip)

Hi Rob,
I totally agree with your conclusion that dense pack cellulose is not an 
effective air/vapor barrier.

What I have a problem with is the fact that the Canadian government test 
results are listed in six significant figures.  Anyone who has taken a 
quantitative analysis class would know immediately that this sort of testing 
is not reportable to six significant figures.  If a group reporting 
quantitative results does not understand the process of quantitative 
analysis then I suspect that the findings of that group may have other 
problems as well.  Possibly not, but visibly shoddy work...
-Bob Korves