What is a "locus"? The term was used to describe how a wooden house is set up. They used "locus pipes".
Thanks for your help.
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The only thing that comes to mind (and it's not related to wooden house construction at all) when thinking of pipes and the word locus is that in German, "Lokus" is a term used for a toilet (perhaps it's a little nicer to say than toilet). That would fit your description of "locus pipes" - the waste pipes (and maybe supply) for the toilets.
Source: I'm a native German speaker. Also see the German Wikipedia entry for "Toilette"