Demolition safety: 9 rules to check on site

• Calculate shed depth from the building face. According to Legal Information Institute , employee entrances to multi-story structures being demolished require sidewalk sheds or canopies that provide protection for a minimum of 8 feet from the face of the building.
• Guard wall openings at 42 inches. The same source specifies that where a hazard exists for employees falling through wall openings, the opening must be protected to a height of approximately 42 inches.
• Enclose debris drop zones with specific barricades. When dropping debris through floor holes without chutes, Legal Information Institute requires the area to be completely enclosed with barricades that are not less than 42 inches high and not less than 6 feet back from the projected edge of the opening above.
• Verify canopy width and load capacity. Canopies must be at least 2 feet wider than the building entrances or openings, which means 1 foot wider on each side, and must be capable of sustaining a load of 150 pounds for each square foot, as stated by Legal Information Institute .
• Sequence your pre-demolition checks. Use these four dimensions—depth, height, enclosure, and load—as your primary verification points before authorizing crew entry to the structure.

The nine compliance items below map specific regulatory values to their publishing sources. Each row cites the exact requirement from its source, ensuring your site plan matches the cited standard without adding unverified local amendments.

The Legal Information Institute specifies that canopies must sustain a load of 150 pounds for each square foot. For impalement hazards, the California Department of Industrial Relations requires protective covers made of wood, plastic, or materials of equal or greater strength, with a minimum 4-inch by 4-inch square surface area. These state-specific standards apply to exposed reinforcing steel at grade or above, where the maximum height of fall exposure to the top of the cover does not exceed 7 1/2 feet.

Verify each dimension against your local jurisdiction before finalizing the site layout.

According to the Legal Information Institute , a competent person must perform the engineering survey prior to permitting employees to start demolition operations. The survey determines the condition of the framing, floors, and walls. It also assesses the possibility of unplanned collapse of any portion of the structure. This step is the first rule in your compliance checklist. You cannot authorize work until this assessment is complete. The survey identifies weak points that could fail during the demolition process.

If the structure has suffered damage from fire, flood, explosion, or other causes, additional support is required. The Legal Information Institute states that when employees work within a damaged structure, the walls or floor shall be shored or braced. You must inspect the site for these specific types of damage. If you find fire, flood, or explosion damage, you must install shoring or bracing. This protects workers from sudden structural failure.

Action step: Assign a competent person to conduct the engineering survey and document the condition of all framing, floors, and walls before any demolition begins.

Employee entrances to multi-story structures being demolished require complete protection by sidewalk sheds or canopies, or both, according to Legal Information Institute . This protection must extend from the face of the building for a minimum of 8 feet. The regulation specifically addresses multi-story structures, so verify if your site matches that scope before applying this dimension to other building types.

Canopies used for this protection have specific width and load requirements. All such canopies must be at least 2 feet wider than the building entrances or openings, meaning 1 foot wider on each side thereof, according to Legal Information Institute . Additionally, these canopies must be capable of sustaining a load of 150 pounds for each square foot. These figures define the structural capacity and physical footprint required for the canopy itself.

When planning your site layout, measure the exact width of each entrance or opening you intend to protect. Add 1 foot to each side to determine the required canopy width. Confirm the structural design supports a load rating of 150 pounds for each square foot. Ensure the canopy extends at least 8 feet from the building face to meet the depth requirement for employee entrances.

If your demolition involves multiple entrances, apply these width and load specifications to each one individually. Do not assume a single canopy design fits all openings without recalculating the width based on the specific entrance dimensions. The 8-foot depth requirement applies to the protection zone from the building face, ensuring a defined buffer area for employees entering or exiting the structure.

Check your local amendments to see if they impose stricter requirements than these federal standards. The cited rules provide the baseline, but local jurisdictions may have additional specifications for sidewalk sheds or canopies. Verify the load capacity calculations with your structural engineer to confirm the rating of 150 pounds for each square foot is met for your specific canopy design.

A demolition has one employee entrance. The canopy must extend at least 8 feet from the building face and be at least 2 feet wider than the entrance, which means 1 foot on each side. Confirm that the canopy design can sustain a load of 150 pounds for each square foot before crew entry.

When dropping debris through floor openings without chutes, the area where material lands must be completely enclosed with barricades. According to Legal Information Institute , these barricades must be at least 42 inches high and positioned at least 6 feet back from the projected edge of the opening above. This specific enclosure requirement applies when debris is dropped through holes in the floor without the use of chutes, ensuring the drop zone is physically separated from general work areas.

For materials and equipment near excavations, protection is required to prevent items from falling or rolling into the dug area. GovRegs states that employees shall be protected from excavated or other materials or equipment that could pose a hazard by falling or rolling into excavations. This protection can be achieved by placing and keeping such materials or equipment at least 2 feet from the edge of excavations. Alternatively, you may use retaining devices that are sufficient to prevent materials or equipment from falling or rolling into excavations, or a combination of both if necessary.

Recheck barricades and retaining devices during the work day, since the distances above only hold while they stay in place.

Underground structures and exposed steel present distinct hazards that require specific controls during demolition. You must address these risks before your crew enters the excavation area.

Underground support systems

According to GovRegs , sidewalks, pavements, and appurtenant structures shall not be undermined unless a support system or another method of protection is provided. The same source states that while the excavation is open, underground installations shall be protected, supported, or removed as necessary to safeguard employees. If water is controlled or prevented from accumulating by the use of water removal equipment, that equipment and its operations shall be monitored by a competent person to ensure proper operation. For a pre-entry checklist, see Excavation safety: 7 checks before crew entry .

Impalement protection at grade

The California Department of Industrial Relations requires that employees working at grade or at the same surface as exposed protruding reinforcing steel be protected against the hazard of impalement California Department of Industrial Relations . This protection involves guarding all exposed ends that extend up to 6 feet above grade or other work surface with protective covers or troughs California Department of Industrial Relations . For employees working above grade or any surface and exposed to protruding reinforcing steel or other similar projections, the same source mandates protection against the hazard of impalement California Department of Industrial Relations .

Cover specifications and limits

Protective covers shall be made of wood, plastic, or other materials of equal or greater strength, according to the California Department of Industrial Relations California Department of Industrial Relations . These covers shall have a minimum 4-inch by 4-inch square surface area, or if round, a minimum diameter of 4 1/2 inches California Department of Industrial Relations . However, protective covers shall not be used to protect against impalement where the maximum height of fall exposure, to the top of the protective cover, exceeds 7 1/2 feet, unless the protective covers meet the requirement of subsection (d)(4)(D) California Department of Industrial Relations .

Verify that your covers meet these material and size standards before installation. For more on covers, see Protective covers: 6 fall safety checks to verify .

Next step today: Walk each employee entrance, wall opening, and debris drop area on site, and compare them with the 8-foot, 42-inch, and 6-foot measurements above before crew entry.

How far must a sidewalk shed extend from the building face?

According to the Legal Information Institute , sidewalk sheds or canopies must provide protection from the face of the building for a minimum of 8 feet. This requirement applies specifically to employee entrances in multi-story structures being demolished. You should verify that your shed design meets this 8-foot depth standard before installation.

What is the required width for demolition canopies?

The Legal Information Institute states that canopies must be at least 2 feet wider than the building entrances or openings. This translates to being 1 foot wider on each side of the entrance. The source also notes that these canopies must be capable of sustaining a load of 150 pounds for each square foot. Ensure your canopy dimensions account for this width and load capacity.

How high must wall opening protections be during demolition?

When a hazard exists to employees falling through wall openings, the Legal Information Institute requires that the opening be protected to a height of approximately 42 inches. This guard height is designed to prevent falls through the opening. Check your wall opening guards to confirm they meet this specific height requirement.

What is the minimum distance for storing materials near excavation edges?

According to GovRegs , materials or equipment must be placed and kept at least 2 feet from the edge of excavations. Alternatively, you may use retaining devices sufficient to prevent materials from falling or rolling into the excavation. A combination of distance and retaining devices is also acceptable if necessary. Maintain this 2-foot buffer or install proper retaining devices.

Who must perform the engineering survey before demolition starts?

The Legal Information Institute specifies that an engineering survey must be made by a competent person. This survey is required prior to permitting employees to start demolition operations. The survey determines the condition of the framing, floors, and walls, as well as the possibility of unplanned collapse. Assign this task to a qualified competent person before work begins.