First, know that Egyptian Buildings would be flat roofed, often brightly painted, with only the most basic of building having a thatched roof (Straw was much to important a commodity for use in Brick making to be wasted on something like a roof). A little Google-Fu and the following link will give you some insight into how the Egyptians built their buildings:

http://www.reshafim.org.il/ad/egypt/building/