22NW Fund SC 13D/A DIRTT ENVIRONMENTAL SOLUTIONS / 22NW Fund ownership change

Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the common shares, without par value, of DIRTT Environmental Solutions Ltd., a company organized under the laws of Alberta, Canada. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: April 28, 2022

22NW FUND, LP
By:	22NW Fund GP, LLC General Partner
By:	/s/ Aron R. English
	Name:	Aron R. English
	Title:	Manager

22NW, LP
By:	22NW GP, Inc. General Partner
By:	/s/ Aron R. English
	Name:	Aron R. English
	Title:	President and Sole Shareholder

22NW FUND GP, LLC
By:	/s/ Aron R. English
	Name:	Aron R. English
	Title:	Manager

22NW GP, INC.
By:	/s/ Aron R. English
	Name:	Aron R. English
	Title:	President and Sole Shareholder

/s/ Aron R. English

ARON R. ENGLISH

Individually and as attorney-in-fact for Cory J. Mitchell, Ryan W. Broderick, Bryson O. Hirai-Hadley and Alexander B. Jones