1) To underdraw a ceiling or roof is to cover the underside of exposed beams and joists, either with boards or with lath and plaster.

1764 Ten of the rooms have board floors, one ceiled … plaister'd and underdrawn … 3 of the chambers, 2 of which … are plaister'd and underdrawn, Kirby Underdale. In dialect the 'underdrawing' is the space between the ceiling and the roof

that is the loft.

dates 1764

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