The rafter tails are not in alignment with each and every roof rafter. To keep an authentic historical look, space the rafters further apart than current framing codes allow. Older structures often had 20″, 24″ or greater spacing between framing members. Today’s conventional standard is 16″ o.c., which is a dead giveaway that it’s new construction. We want it to have the feeling of being old.
If a house is framed without any roof overhangs, it's easier to seal the seam between the wall sheathing and the roof sheathing. This approach creates an exterior air barrier that is nearly airtight. Once the sheathing seams have been sealed, an "applied eave" is framed with 2x4s to create the necessary overhang. On this roof, the gaps between the 2x4s will be filled with 3 1/2-inch-thick rigid foam insulation. The same insulation will cover the entire roof deck.