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.

  • 1
    Related (I think it's a duplicate, but it's unanswered): judaism.stackexchange.com/questions/46211/…
    – Joel K
    Commented Oct 14, 2018 at 12:12
  • Welcome to MiYodeya Dave and thanks for this first question. Great to have you learn with us!
    – mbloch
    Commented Oct 14, 2018 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. Commented Oct 14, 2018 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
    Commented Oct 14, 2018 at 20:22

1 Answer 1


Mishnah Brurah 629 s.k. 26: says indirect support is not a problem:

(כו) לחבר וכו' במסמרות של ברזל - זה מותר לכו"ע אפילו למאן דאוסר להעמיד הסכך בדבר המקבל טומאה כיון שאין סומך הסכך על המסמורים אלא שמחזיק בהם הכלונסות המעמידים להסכך

The majority of poskim agree that it is fine.

The Chazon Ish (O.C. 143:2) however holds that indirect support is the same as direct support and should therefore preferably not be used.

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