Re: [GBlist] IRMA and green roofs

[Speireag Alden <Joshua.M.Alden.91@alum.dartmouth.org>]

Sgrìobh Alan Abrams:

>I like the concept of IRMA for green roofs, because it allows one to expose
>roof structure, and to dodge the issue of condensation in the
>(conventionally framed) roof cavity.  However, I feel a little shaky on the
>effectiveness of the insulation, and of rainwater filtering under the
>floradrain (or eq).
>
>can anyone comment on the placement of rigid foam insulation placed on the
>weather surface of a roof membrane?  would there be a great deal of heat
>loss if a thin drainage plane (like Enkdrain) were placed between the
>insulation and the membrane?

     When I did my roof, I worried about meltwater sneaking under the 
insulation and carrying the heat away.  So, in addition to the very 
tough bituthene membrane under the insulation, on top of the 
insulation I laid down a sheet of poly, and then the earthen layer. 
I figured that even with the inevitable pinholes in the poly, there 
would be very little water getting under the insulation.

-Speireag.

-- 
Recently, I was asked if I was going to fire an employee who made a 
mistake that cost the company $600,000. No, I replied, I just spent 
$600,000 training him. Why would I want somebody to hire his 
experience? -Thomas J. Watson, industrialist (1874-1956)

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