With the completion of the roof, the exterior framing is completed by the addition of the porch roof, end-caps to the roofing and other basic framing items.  As you can see, the house now has form and the rooms are laid out so you can walk between them.  Now you finally get a good feel for the size and layout of the actual house.   The crew will go back and inspect every wall and check them for straightness and levelness.  Uneven boards will be made even and the construction crew will double check their carpentry.