Occupational Health and Safety Code

The Occupational Health and Safety Code provides specific technical health and safety rules and requirements for Alberta workplaces.

Alberta Regulation 191/2021

Part 30 Demolition



Worker in charge



An employer must ensure that a competent worker designated by the employer is in charge of the demolition work at all times while work is in progress.


Location of equipment



An employer must ensure that temporary offices and tool boxes are outside of the range of falling materials.


Hazardous substances



Before demolition begins and while demolition work continues, an employer must ensure that

(a) all chemical and biological substances that may be hazardous to workers during demolition are removed from the structure or the part of the structure that is being demolished, and

(b) existing concrete at the work site is not disturbed or removed until any embedded facilities have been isolated or their location marked in accordance with section 447.


Use of explosives



If a structure is to be demolished using explosives, an employer must ensure that a competent person develops a demolition procedure to protect the health and safety of workers.


Disconnecting services



An employer must ensure that

(a) all utilities are disconnected before demolition begins, and

(b) written confirmation of the disconnection by the person who disconnects the utilities is available at the work site.


Materials chute



An employer must ensure that a materials chute that is at an angle of more than 45 degrees from the horizontal is totally enclosed.


An employer must ensure that

(a) workers cannot enter an area into which material is dropped, thrown or conveyed by a materials chute, and

(b) conspicuous warning signs in the area advise of the danger.


Dismantling buildings



An employer must ensure that if a building or structure is being demolished,

(a) all glass and windows on the exterior walls of the building or structure and adjacent to a public walkway are removed before demolition begins,

(b) if the demolition may affect the stability of an adjoining building or structure, the demolition is carried out in accordance with procedures certified by a professional engineer that safeguard the stability of the adjoining structure,

(c) if tensioned steel cables or bars are known to be in the building or structure, demolition procedures are certified and supervised by a professional engineer,

(d) if there are workers in the building or structure during the demolition, the demolition is performed floor by floor from the top down,

(e) steel structures are dismantled column length by column length and tier by tier,

(f) a structural member that is being removed

(i) is not under stress, other than its own weight, and

(ii) is secured or supported to prevent unintentional movement,


(g) unless it is being demolished at the time, a wall or other part of the building or structure is not left unstable or in danger of collapsing unintentionally.


A person must not allow materials or debris to accumulate in a building or structure being demolished if the accumulation could result in the collapse of a part of the building or structure.


Building shaft demolitions



An employer must ensure that a free‑standing scaffold is used in the demolition of a building shaft from the inside of the shaft.