How to Make Rafter Tails

Determine the amount of overhang desired and mark one of the end rafters on its top edge. Measure that distance with a tape measure and mark the same distance on the other end rafter on the same side of the building. Run a chalk line between the two measurements and look for inconsistencies in the rafters. Snap a chalk line between the two marks.

Determine what type of rafter tail is going to be used. Fascia is attached to two common types of rafter tails -- square and plumb. If the rafter tails are going to be squared, lay a speed square on the chalk marks to scribe a line. Cut with a circular saw along the fascia square line. Use a level to mark plumb lines on the rafters if the rafter tail is going to run plumb. Cut the rafter tails along the fascia plumb line. Run a string line across the cut rafter tails to ensure they were cut evenly.

Determine if a plancher needs to be cut. A plancher is a horizontal cut on a plumb rafter tail when the width of the fascia board that sits on the end of the rafters is smaller than the fascia plumb line. Mark an end rafter on the face of the plumb cut smaller than the width of the fascia board. Typically, it's not more than 1 inch shorter. Mark the same measurement on the other end rafter and snap a chalk line across the front of the fascia plumb cuts. Scribe a horizontal line across the rafter tails using a speed square. Cut the plancher on each rafter tail on those lines. Use a string line to ensure the planchers are cut evenly.