[Cob] waterproofing the bermed side

[Leslie Moyer]

No experience, but I've been wrestling with a similar situation (a 
project still in development) and my plan is to use a layer (or two) of 
used carpeting next to the primary wall (fluffy side out), then a layer 
of pond liner (EPDM), then another layer of carpet (fluffy side toward 
the liner), then a thick layer of gravel (to act as a french drain) and 
then a layer of high-quality (thick) landscape filter fabric (to keep 
the voids in the gravel from filling with soil particles.

The carpet serves to protect the EPDM from punctures from any sharp edges.

--Leslie


Tys Sniffen wrote:
> Hey folks,
>
>  
>
> I'm putting in my stem wall for my cob house, and slightly 'berming' the
> north side.  My bond beam is about 10 inches thick (high) and I'll be
> building an urbanite stem wall above that; about 2 to 3 feet high on the
> north side to reach above the soil.  
>
>  
>
> Of course I've already got the French drain in the trench underneath the
> bond beam, and I'll be doing another perforated pipe in gravel along side
> the wall, underground, and mostly back filling with gravel, but: I intend to
> waterproof that portion of the wall that's underground. Suggestions?
>
>  
>
> I've heard about 'Bentonite', I was thinking about tar paper, I know there's
> a number of (ugly, toxic) asphalt type things, from that silver roof paint
> goo to other concrete waterproofing stuff. 
>
>  
>
> I'm trying to balance toxicity, with price, with ease of use, with
> functionality.  Any experience out there?
>
>  
>
> Tys
>
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