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The following chapter will discuss the laws of setting up dividers and roofing on Shabbos. Roofing is defined as any item which hovers over a surface, such as an umbrella, or a tent, or a table. The problem involved in setting up the above items on Shabbos is because it is a subcategory of the building prohibition. At times it is Biblically forbidden at others only Rabbinically and at others it is even initially allowed to be done. These details will be discussed in this chapter.
 Halacha 1