Top of wall ventilation screed device and assembly

A ventilation screed assembly configured to be mounted at a vertical wall of a structure, the ventilation screed assembly comprising:

• at least two ventilation screeds, each ventilation screed of the at least two ventilation screeds comprising (i) an attachment flange having an upper end region and a lower end region opposite the upper end region, and (ii) a cavity structure disposed along the upper end region of the attachment flange, the cavity structure having a first side, a second side, and a third side, wherein (i) the first side extends from the upper end region of the attachment flange, (ii) the third side extends over the first side and is spaced from the first side and from the upper end region of the attachment flange, and (iii) the second side extends between the first side and the third side;
• a connector connecting adjacent ventilation screeds of the at least two ventilation screeds, the connector comprising a three sided connector corresponding to the cavity structure;
• wherein the connector is partially received in the cavity structure of each of the adjacent ventilation screeds to connect the adjacent ventilation screeds;
• wherein, with the ventilation screed assembly mounted at the vertical wall of the structure, each third side of the at least two ventilation screeds comprises an uppermost surface of the respective ventilation screed;
• and
• wherein each cavity structure of the at least two ventilation screeds comprises a gap between the upper end re ion of the attachment flange and an end of the third side that is distal from the second side.

A ventilation system for moisture ventilation at an upper edge region of a vertical wall of a structure, the ventilation system comprising:

• a drainage element disposed along a base layer of a vertical wall of a structure;
• a ventilation screed disposed outboard of the drainage element along an upper edge region of the vertical wall, the ventilation screed comprising an attachment flange, a drainage cavity structure, and a ventilation spacer;
• wherein the drainage cavity structure comprises an uppermost surface of the ventilation screed;
• wherein the drainage cavity structure comprises a gap between an upper end region of the attachment flange and an end of the uppermost surface of the ventilation screed;
• and
• a casing bead disposed at an outboard side of the attachment flange of the ventilation screed, wherein the casing bead engages the ventilation spacer of the ventilation screed and is spaced from the drainage cavity structure by the ventilation spacer, the casing bead configured to receive a finishing material of the vertical wall.