Big Green: Pole barn - green roof

[Waldron, Adam]

This may be a little off topic, but I figure with all the wealth of
knowledge on this list, someone may be able to help me.

 

I am diggin out the side of a hill to make a simple shed, with a single
sloped  roof that "roughly" follows the contour of the existing hillside
(at leas the the slope direction will be the same J.  I understand all
the basic principles and components of a green roof system.  I need help
with the the size and spacing of structural members.  

 

I want to do a building that is 20' by 30'.  I am going to use an EPDM
pond liner on the roof, and maybe six inches of soil.    I have a bunch
of 2x12's available to me that came out of the flooring for an old
building.  I was planning on using these for my roof.  I am planning on
using pressure treated posts and beams.

 

I know a metal roof would be much simpler, but the idea here is to blend
in with the exisiting environs etc.  For now the front will be open.  I
need at least one "bay" that is 12'-13' wide so I can fit my dozer in.

 

Any advice is appreciated.

 

Thanks,

 

Adam


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