Cecil Hewett's book "English Historical Carpentry" follows the developement of joinery techniques from the Saxons through the eighteenth century. Hewett gives the evolution of diminished haunches in floor joist and minor purlins in the Tudor era. This was an important innovation in joining the joist well with minor weakening of the beam by avoiding cutting the compression wood on the top of the beam.
Expedient carpentry has the "increasing haunch" as a patching in method, where a sloping housing cut by handsaw into the outside or upper face of a post or beam to nothing on the joist or purlin bottom or inner face, the waste is chiselled out and the piece is slid in and toe nailed.
But generally, the old buildings I see mostly have unhoused joinery on the reference side.
