When folding the crowns, in correspondence with the drawing, the openings are left for doors and windows. To place a blocking crown, you need to cut the opening along the plumb line, finish the ends so that they end with the rowing of the vertical direction. The upper and lower part of the opening must be without a crest. When installing boxes in the openings and jambs, you need to leave four or five centimeters for a shrinkage in height.
