(B) The notch is called a bird's-mouth
. Without a bird's-mouth
, the rafter would be resting only on the edge of the top plate.
Omit the bird's-mouth
from four rafters and use these on the ends.
If the ridge and bird's-mouth
cuts fit tight, label one of the rafters as a pattern and use it to mark the remaining 2x4s for cutting.
Note that the rafters have a small "bird's-mouth
" cutout at the eave, as shown in Fig.
Calculating the length, angled end cuts and bird's-mouth
cut-outs of the roof rafters takes a healthy dose of trial and error (Photo 7 and Fig.