As nouns the difference between dafter and rafter
is that
dafter is while
rafter is one of a series of sloped beams that extend from the ridge or hip to the downslope perimeter or eave, designed to support the roof deck and its associated loads or
rafter can be a raftsman.
As an adjective dafter
is (
daft).
As a verb rafter is
to make (timber, etc) into rafters.