[Cob] Can I lay tile over a cob subfloor?

[tbachdrums2 at yahoo.com]

Anna,

How many SF or square Meters is the bathroom and the amount of floor to be tiled?  Is the shower/bath area completely dried in, or will some humidity get to the subfloor through wicking from the walls to the subfloor?
How high off the ground level is the cob subfloor?

It's hard to say without seeing your set up, but for the areas that receive a ton of moisture like a bathroom area, I would go with as few surfaces that will harbor mold as possible, and favor surfaces that are easy to clean.

If this area is going to have a bath and shower,...then embedding it in cob, at least to my ears of working in Texas and North Carolina, seems like that will mean a lot of work to keep it clean and dry in the years to come. 



On Jan 26, 2017, at 3:45 PM, <avjyoung at shaw.ca> <avjyoung at shaw.ca> wrote:

All of our subfloor and most of our finish floor is cob, but we are wanting to lay some tiles in the bathroom to stop any water getting in. I am OK with bedding them in a layer of the finish cob with a spacing between them to allow for cob drying (with cob well oiled and waxed), but my husband is not sure this will keep it dry enough. He is keen on a layer of thin waterboard over the cob subfloor, with the tiles laid on that, to prevent any water getting in. I don’t think we need to go this far, but would love some insight.

Ta muchly,

Anna
Cob/strawbale hybrid in Victoria BC. Ten years and counting....
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