The lookouts or horizontal members that extend out end up a rake roof framing are generally what size?

The horizontal members that extend out over a rake roof—commonly referred to as lookouts—are typically sized at 2x4. This size offers a balance between adequate support and the lightweight necessary for effective framing. A 2x4 is sturdy enough to handle the loads they encounter, yet it is also easy to work with in terms of installation and alignment.

While larger sizes like 2x6, 2x8, and 2x10 are indeed stronger, they may be excessive for this particular application and could add unnecessary weight and complexity to the roof structure. Additionally, using a smaller dimension like a 2x4 ensures that the framing stays within standard building practices and maintains overhangs that are functional without being overly cumbersome.