[Greenbuilding] Green Roof under deck

[John Salmen]

Ditto again. 3" is plenty for extensive type roofs with sedum cultivation.
Cultivating the root system to retain the soil becomes issue. Spray systems
with chopped sedum and gum binder (similar to what they spray on highway
banks with seedings) is my preference though I don't think it is widely
used. Can hold soil on a roof slope easily until roots take over.

 

I don't get what the glass over the plantings is for?  Why not a regular
deck over membrane and gravel (sandblasted glass if you want as a decking -
still slippery) with equivalent mass in plantings in planters? 

 

From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of David Wentling
Sent: January-25-13 8:33 AM
To: Green Building
Subject: Re: [Greenbuilding] Green Roof under deck

 

There are proven systems with 3" soil depths with sedum systems.
Conservation Technology out of Baltimore offers a thin, light weight system.
To protect the glass deck in summer from being a greenhouse, consider using
outdoor carpet as a shade system. Attach for wind control. Indirect sun
should be OK for most sedums. 

You stated that the deck would be open on two sides and attached to walls on
two sides. Consider a 2" gap along the walls to encourage ventilation. Plan
for uplift loads!!
 

David Wentling
ConservFirst.com

  _____  

From: Tim Brown <tim34 at optonline.net>

I've  followed  some  of  your  posts  and
like  your  approach  to  work  in  the  big  apple.
Feisty  clientele  me  thinks.
I'm 25  years  in  business  doing  roof  gardens  in  Manhattan  and  a
few    in
Brooklyn.

When  you  say  3"  green  roof  are  you  referring to  soil  depth?
This  sounds  a  bit  to  shallow .  I  believe  the  light    version  of  
green  roof design  calls  for  double  that  depth  and  only allows  for
use  of
sedum  type  planting  ( no  glass).  12"  soil depth  gives  greater
options for  planting . 

Covering  with  glass might  work  in  winter  but
not  in  summer  for  sure.    You  are  sort  of  describing  a  cold
frame
set  up.

Weight  issues  are always  a  concern  especially  on  brownstones  unless
you  are  reworking roof  structure.  

Hard    to  give  feed  back  with  out  some  more  clarification. 
If  decking    is  up  2'  off  roof  surface    than  you have  good  depth
for  planting.

On Jan 24, 2013, at 5:34 PM, Gennaro Brooks-Church - Eco Brooklyn wrote:

> I just salveged some tempered glass. I have a client who wants me to
> build a 3" green roof on his brownstone plus a deck that sits 2' above
> the roof.
> I suggested a glass deck and green roof under it.
> He is concerned the vegetation under the glass deck will not survive
> since it will bake in the summer.
> Are there any experienced landscapers on this list who can offer their
> experience?

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