Rethink Your Life!
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[Cob] was cob floor debates: now drainageBarbara Roemer roemiller4 at gmail.com
Sun Apr 19 13:41:18 PDT 2009
Tys, Sounds like you've carefully considered your drainage needs and generally provided for them. As you have a hill above you (if I understand your site correctly), you're right about your "3" spots" being potentially troublesome. We have a little hill - only 2-3 feet high, about 5' away from our slab (remember we didn't build this - it's an ill-sited renovated garage). But, local conditions obtain - that is, the ground beyond or above the hill slopes gradually uphill further, all of it is undermined by rodent tunnels and the open channels of a constantly-renewing-itself-conifer forest where when a tree comes down or is overshadowed by its taller mates, the roots die and leave more tunnels. Whenever it rains hard, which is several times per winter/spring, the hillside gushes with water under higher pressure than our 50 feet of head water tank provides. Water spouts out of the hillside and collects in a torrent running along that 5' wide path adjacent to the house. It's more volume than a trash or sump pump can deal with: we run one steadily through a heavy rainfall. Of course the foundation and slab get wet, as does the soil beneath. Whatever vapor barrier there might have been (and it looks like it was maybe 1 mil eons ago) has deteriorated to the point that even weeks after a rainstorm, if the dawg sleeps on her bed on the slab, condensation occurs under the bed. That even with only about 40% humidity today. The point is that local conditions can vary so widely, it's impossible to give you other than "what if" scenarios without seeing your site and soil. It sounds like you're doing a good job of worrying it - I would put in the vapor barrier, but I"m not on site, and that's based on my experience which couldn't be much worse! Keep batting it around here until you've figured it out - we all benefit from each other's experiences. Barbara
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