Confined Space Entry in Construction: What It Is and Why It Matters

In construction and site work, confined space entry refers to working in areas that are not designed for continuous occupancy and have limited means of entry or exit, yet large enough for a worker to enter. 

Some examples of these spaces include:

• Underground utility vaults
• manholes
• Sewer systems / Septic Tanks
• Storage tanks
• Trenches or pits deeper than 4 feet
• Stormwater detention systems
• Attics / Crawl Spaces
• HVAC ducts 
• Sub-slab environments

These spaces often present serious hazards such as low oxygen levels, toxic gases, engulfment risks, and limited ventilation.

OSHA classifies confined spaces into two categories:

1. Non-Permit Required Confined Spaces – Still hazardous, but without immediate life-threatening dangers.
2. Permit-Required Confined Spaces – Contain or may contain serious hazards (e.g., toxic gases, engulfment risk, hazardous atmosphere).

If a confined space is permit-required, OSHA mandates specific procedures before and during entry.

https://www.osha.gov/confined-spaces

• Atmospheric Testing – We test oxygen levels and monitor for gases like carbon monoxide, hydrogen sulfide, and methane and others using calibrated monitors.
• Ventilation and Monitoring – Forced-air ventilation is used when required, and continuous monitoring helps ensure safe breathing conditions inside the space.
• Rescue Plan and Standby Personnel – A trained attendant remains outside the confined space at all times, ready to call for rescue or act in an emergency. Tripods, harnesses, and retrieval systems are in place as needed.
• Training and PPE – All crew members receive confined space entry training, and wear proper PPE including harnesses, gas monitors, and communication devices.
• Permit System – We maintain written permits, checklists, and documentation for every entry — even in non-permit spaces — as part of our safety culture.
  

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