Big Green: Thermal value Vegetated Roofs

[Charles Leahy]

Hi Charles,

 

Hope you're doing well.  I'm in Raleigh next week and can touch base again
if you'd like.  We just manufactured a roof panel for northern Ontario -
above arctic circle - that will perform at better than R60 and is only 8.5"
thick (takes advantage of the inverse relationship between polyurethane K
factor (1/R) & temp) and could support a vegetative roof in any environment.
I've also shot a note to one of my friends on the ASHRAE code council and
asked for his input.

 

Regards,
Charles Leahy

Eco-Panels

 

  _____  

From: biggreen-bounces at lists.biggreen.org
[mailto:biggreen-bounces at lists.biggreen.org] On Behalf Of JOHN SALMEN
Sent: Wednesday, April 01, 2009 9:16 PM
To: 'Charles Brown'; 'BigGreen List'
Subject: Re: Big Green: Thermal value Vegetated Roofs

 

I doubt you will find prescriptive values as it would vary from extensive to
intensive type roofs as well as soil mix design and local precip./
saturation requirements and drainage, etc... - Dr. Karen Liu at the NRC in
Canada has been working for the last decade on green roof research so would
be the source. Here is a link to an old article
http://www.eltgreenroofs.com/pdf/ELT-NRCC45345.pdf

 

 

You could design a roof and assign values based on the material properties
(design mix) and assume values for saturation including potential snow
coverage (very insulating). I've done this before and it's a piece of work.

 

JOHN SALMEN ENVIRONMENTAL DESIGN

4465 UPHILL RD,. DUNCAN, B.C.  CANADA, V9L 6M7

PH 250 748 7672 FAX 250 748 7612 CELL 250 246 8541

terrain at shaw.ca

 

  _____  

From: biggreen-bounces at lists.biggreen.org
[mailto:biggreen-bounces at lists.biggreen.org] On Behalf Of Charles Brown
Sent: April 1, 2009 4:58 PM
To: BigGreen List
Subject: Big Green: Thermal value Vegetated Roofs

 

Pardon if duplicated - had two addresses for the list - hope this one's
right.

 

Anyone run across recent research on green roof R-values. Needs to be peer
reviewed / scientific enough for ASHRAE to include as a prescriptive
allowance in energy code. My own tests are anecdotal at best.

Thanks, Charles

Charles Brown, AIA LEEDC ap
Brown Architecture Inc.
mail: 324 So. Wilmington Street - # 117
Raleigh, North Carolina 27601
office: 124 Cox Ave., Raleigh 27605
919.803.3700


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