I understand that it is preferable to support schach with materials that would themselves constitute schach.

I cannot find any information on whether it is permissible to use metal screws/nails to, for example, join two timber roof supports in the middle of the sukkah, under the schach. The schach would not be in contact with the metal screws, but it would be supported by timber which requires the screws to stay up.

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    Related (I think it's a duplicate, but it's unanswered): judaism.stackexchange.com/questions/46211/… – Joel K Oct 14 '18 at 12:12
  • Welcome to MiYodeya Dave and thanks for this first question. Great to have you learn with us! – mbloch Oct 14 '18 at 12:44
  • Hi Dave, even if it was placed on metal, it would be kosher bediavad. If it's a minute part of the schach, it's batel to the rov. – chacham Nisan Oct 14 '18 at 14:59
  • Hi Nisan, thanks, but I don't think that answers my question - I'm asking about what is permissible for the preferred supports for the schach. – Dave Oct 14 '18 at 20:22

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