The Schach should not be directly secured or supported by any object which is unfit to be used as Schach. [Examples: Metal rods or cables, nails, plastic cable ties, nylon thread, nearby trees, processed fiber thread or ropes.] However, these materials may be used to secure or support the Schach indirectly. [e.g. to secure or support the beams supporting the Schach.]
The Schach may be tied down with reeds or unprocessed fiber threads, and may also be directly supported by the Sukkah walls (or any adjacent walls or roofs).
Although construction timber is not used for Schach, it may nevertheless be used to directly support or secure the Schach.
A Schach mat may be used when strung together with unprocessed fiber threads. If strung together with processed fibers or with metal threads, it may still be used if the mats are laid out in a way that the individual reeds will remain in place even without the threads. [e.g. they should be laid out perpendicular to the supporting beams, and several beams should be placed on top to hold them down.]
If one did not adhere to any of the requirements listed in this section and the Sukkah is already built, it may be used and there is no obligation to fix it.
