Yosef Karo

“ There are those who say that if a sukkah is properly schached and there is fear that it will the schach will dry out or leaves will fall and the sunlit area will be more than the shaded area, they spread a sheet over it so that it fall not dry out or under it so that the leaves will not fall, because the sheet ensures that the shade will be greater than the sun, it is invalid. ”

“ If they were harvested for food, the handles are considered food with respect to receiving impurity and the non-food needs to be enough to nullify both the food and the handles. If they were harvested for schach, the handles are not considered food and, on the contrary, they can be combined with the waste to nullify the food. If they were harvested for food and then one decided to use them as schach, this thought does not remove the handles from being considered food until an action is done with them to show that they are intended to be used for schach, like threshing them. ”

“ However, if [a substance] does not grow from the ground, even if it grows on the ground and is not susceptible to ritual impurity, such as unprocessed animal hides that are not susceptible to ritual impurity, or metal items, it may not be used as schach. ”