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[Cob] Fw: Living roof and (a somewhat steep) pitch - methods to helpsoil from sliding off?

Nancy Striniste nstriniste at
Fri Sep 19 19:04:56 CDT 2008

I got the dimensions of the trays wrong-- they are just under 1' x 2' x 2" 

----- Original Message ----- 
From: "Nancy Striniste" <nstriniste at>
To: <coblist at>
Sent: Friday, September 19, 2008 3:18 PM
Subject: [Cob] Fw: Living roof and (a somewhat steep) pitch - methods to 
helpsoil from sliding off?

>> I've done a few sloping green roofs using modular trays.  The trays, like
>> the plastic flats that pots of plants come in at nurseries, are nested 
>> one
>> inside another with a layer of landscape fabric between to hold the
>> growing medium in but let water through. They are about 2' x 2' and are a
>> little floppy so they would probably, when full, conform pretty well to
>> the curve of your roof.  Around the bottom perimeter of the roof you
>> attach what is called a gravel stop-- this is a little deeper than the
>> trays (which are about 2.5" deep) -- made of metal with holes in it to 
>> let
>> water drain out. You can add another 1/2 - 1" of growing medium on top to
>> hide the seams of the plastic trays, then plant your sedums, 
>> sempervivums,
>> etc.  Or, I've planted the trays on the ground, then put them in place,
>> then sprinkled more growing medium around to cover the seams.  All this 
>> of
>> course is built on top of a proper foundation of rubber membranes, root
>> barrier, insulation, and water retention layers.
>> Good luck.  Your house is very cool!
>> Nancy
>> ----- Original Message ----- 
>> From: "Brian Liloia" <evacindustry at>
>> To: <coblist at>
>> Sent: Friday, September 19, 2008 11:30 AM
>> Subject: [Cob] Living roof and (a somewhat steep) pitch - methods to help
>> soil from sliding off?
>>>I just finished constructing my reciprocal roof frame. (A reciprocal roof
>>> a self-supporting, spiraling, conical structure with poles that all bear
>>> the
>>> weight of one another at the top of the frame.) I am concerned that my
>>> pitch
>>> is a little steeper than is common for living roofs. I do not know the
>>> angle, but you can get an idea of the pitch from this photo:
>>> - (I may borrow a
>>> scribe
>>> to calculate the angle later.)
>>> Does anyone have an recommendations for preventing soil from sliding off
>>> of
>>> one's roof? I know of the method of nailing 2x4s across the roof to act
>>> as
>>> steps, but I'm looking for something that might be even more effective
>>> and
>>> efficient. I am not excited about nailing lots of 2x4s across my 
>>> decking.
>>> Thanks!
>>> - Brian
>>> (For more info. on my house and reciprocal roofs, here is my website
>>> address:
>>> -- 
>>> _________________
>>> I live at
>>> I write at
>>> and this is the Year of Mud
>>> _______________________________________________
>>> Coblist mailing list
>>> Coblist at
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