Cob with living roof

[Patrick Hayes]

There are several products which will work well for your membrane.  Hypalon and Duro Last are two.  Both are reinforced PVC.  Hypalon is the material we use on our roof.  It is not a sod roof.  This material has been specified by some builders I know for sod underlayment.


uwe wrote:

> Hi John,
>
> bitumen and derivates are used commonly to impermeabilize houses in Mexico, and my experiences are the worst. Even covered with earth, etc. they dry out, become brittle and begin to leak. Though I don't like plastic, in this case I would probably use it. Protect it with used carpet on both sides, put it down in horizontal layers, beginning at the lower edge, and just glue the sheets together. The capillary effect should be negligable. As long as plastic is protected against sun and puntures, etc., it should last "forever".
>
> Cob On!
>
> Uwe
>
> ----------
> > to renewables
> >
> > you wrote re your earth roof
> > :
> > snip.....
> > The earth roof has an eight inch thick sod over gravel, #2 stone, tu-tuff, 2"
> > insulation, and 1:12 sloping plywood roof (sloping from center). This alone
> > does help keep the building much cooler. It also has a history of lasting much
> > longer than most other roofs if installed properly.
> > .....snip
> >
> > question:
> > what is your waterproof membrane?
> > we are going to put a 6" sod/living roof on the berkeley cob tool shed project
> > & plan on using a torchdown modified bitumen membrane over the wood roof
> > sheathing
> > -we have yet to select a specific manufacturer / brand
> > -can you comment?
> >
> > -or has anybody on the list dealt with a torchdown product or some other
> > membrane for this & what did you use?
> >
> > thanks
> > &
> > cob on
> > john fordice
> > TCCP
> > otherfish at aol.com
> >