[Equest-users] Green Roofs

[Le Du, Karine]

I live and work in Vancouver, BC, where frequent rainfall and the occasional snowfall mean that green roofs have what one might call a dynamic R-value.  Imagine if you will that in the dead of winter during a cold spell that follows  a three week period of intense rain (common scenario), the green roof is essentially a block of ice.  Compare this with a period of drought in the summer time where the moisture content of the green roof is almost nil (assuming an extensive green roof, <6" soil).  It would be inappropriate to assign a static R-value for, say, 3" of soil of a given moisture content, to accurately simulate its thermal properties over the year.
 
As such, we typically do not model the thermal properties of a green roof, only the R-value of the insulation below it.
 
My understanding is that eQuest only deals with static R-values.  I do not know of any work arounds for modeling a dynamic R-value.
 
Karine Le Du, EIT, LEED AP
Sustainable Building Analyst
Stantec

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________________________________

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Eric Kees
Sent: Monday, November 24, 2008 11:28 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Green Roofs



Does anyone know if equest is capable of modeling a green roof, or if there is a work around for accurately modeling one?

 

Eric L. Kees | Mechanical Designer
 
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