ICRA Meaning in Healthcare Construction: Class I–V Matrix and Barriers

Updated September 30, 2026.

Direct Answer: ICRA means Infection Control Risk Assessment—the documented process that assigns a Class I–V precaution level before construction or maintenance disturbs an occupied healthcare building. ASHE ICRA 2.0 crosses activity type (A–D) with patient risk group (Low through Highest) to set dust control, barriers, HVAC isolation, and negative-pressure requirements. It is not an ICU severity score, not a general infection-prevention risk register, and not interchangeable with ILSM (Interim Life Safety Measures), which addresses life-safety impairments on the same job.

In an occupied hospital, ICRA is the permit language on the wall. Wrong class means arguing about dust in oncology instead of finishing the job.

What ICRA Means in Healthcare Construction

In facility management and construction parlance, ICRA is both a process and a class. The process pulls infection prevention, facilities engineering, the contractor, and affected clinical units into one assessment before work starts. The class—Roman numerals I through V in ASHE ICRA 2.0—is the minimum infection-control package for that activity in that patient-risk zone.

Older one-page matrices and legacy “Class 1/2/3” stories still circulate in binders. ASHE ICRA 2.0 replaced that simplified ladder with activity types A–D, four patient risk groups, and five precaution classes. Use the current matrix on the permit; do not map a 2.0 job onto a three-tier handout.

Surveyors expect infection risks controlled during construction and maintenance under Environment of Care and physical environment rules—see CMS Conditions of Participation: Environment of Care Requirements for Hospitals and Joint Commission Accreditation 360: 2026 Physical Environment Standards (unified PE chapter effective January 1, 2026). FGI and ASHRAE 170 design criteria inform the ventilation and isolation goals your ICRA package must meet in occupied space.

Authoritative tool source: ASHE ICRA 2.0 Toolkit (matrix, sample permit, process guide).

How ASHE ICRA 2.0 Assigns Class I–V

Three steps on the form drive the class. First, classify the work as Type A, B, C, or D. Second, identify the highest patient risk group affected (Low, Medium, High, or Highest). Third, read the class from the matrix. If surrounding units will see dust, vibration, or pressure changes, Table 4 may force additional controls or a higher effective class.

Activity types (A–D)

• Type A — Non-invasive work: limited ceiling-tile lifts, clean plumbing, painting without sanding, system checks that do not create dust.
• Type B — Small-scale, short-duration work with minimal dust: above-ceiling cabling, limited drywall removal, controlled sanding, minor flooring.
• Type C — Large-scale or longer-duration work with moderate dust: floor/wall/casework removal, new drywall, single-room renovation, multi-shift tasks, significant vibration or noise.
• Type D — Major demolition or construction: system component replacement, partition work, multi-room renovation, large new build-out.

Patient risk groups

• Low — Non-patient areas (public spaces, offices, mechanical rooms off units).
• Medium — Patient care support (waiting, sterile processing dirty side, kitchen, pharmacy general zone).
• High — Patient care areas (patient rooms, ED, imaging diagnostic, labs, medication rooms).
• Highest — Invasive, sterile, or highly immunocompromised care (OR, ICU, transplant, oncology, clean-side SPD, compounding, invasive imaging).

Matrix: activity type × patient risk group

Permit triggers: Infection control permit and approval are required when the matrix yields Class III for Type C work, and for all Class IV and V assignments. Environmental hazards (sewage, mold, asbestos, gray or black water) bump Low/Medium areas to Class IV and High/Highest to Class V regardless of activity type.

Escalation note: Class III for Type C (Medium risk) or Type D (Low risk) that cannot be fully sealed off from occupied clinical space should include negative-air exhaust requirements per Class IV.

A common field example: Type C renovation in a High-risk patient care area maps to Class IV—critical barriers, anteroom logic, negative pressure, and HEPA exhaust as specified. Always post the matrix result on the permit; do not rely on memory.

Minimum Controls by Class (Table 5 Summary)

Table 5 in ASHE ICRA 2.0 lists mandatory precautions before and during work. Below is a facility-manager reading of each class—not a substitute for the full tool.

Class I

Non-invasive work only. No dust generation. Do not block patient care. Replace displaced ceiling tiles before leaving. Typical Type A work in Low, Medium, or High risk groups.

Class II

Limited dust under standing engineering precautions approved by the organization. Never use Class II for construction or renovation—ASHE states that explicitly. Type B in Low or Medium risk areas.

Class III

Active dust control: polyethylene containment, closed doors, hand-held HEPA vacuum, or equivalent. Isolate or cap supply and return diffusers so dust does not enter the HVAC system and the space does not go positive. Contained areas stay neutral to negative. Seal doors with non-residue tape. Hard-lidded, wipe-down waste containers; adhesive mats per policy. Damp mop or HEPA-vacuum when not fully contained.

Class IV

Critical barriers per NFPA 241: to the deck when ceiling is open, fire-rated penetrations as required. Plastic or hard barriers installed without releasing dust; gaps sealed. ECUs may qualify in small fully contained areas with HEPA exhaust.

HVAC isolation as in Class III. Negative pressure cascades from the occupied side through the entry path into the work zone. HEPA exhaust to outdoors; outdoor discharge 25 feet or more from openings may omit HEPA on the exhaust stream per ASHE, while indoor-directed exhaust must be HEPA-filtered and verified (99.97% efficiency) without upsetting adjacent pressure relationships. No tying into shared return or bathroom exhaust.

Continuous negative-pressure monitoring with a visible indicator on the containment exterior. Shoe covers, clean clothing (cover suits or HEPA vacuum acceptable), wipe-down waste totes, adhesive mats. Consider particulate monitoring during work.

Class V

Everything in Class IV, plus a constructed anteroom sized for staging, cart cleaning, and personnel transition. Disposable coveralls required in the work zone and removed before leaving the anteroom. Anteroom penetrations sealed. Class V is what you see on major demolition adjacent to transplant, OR suites, or ICU bays—Type D in High/Highest zones, or Type C in Highest.

Barrier and ventilation detail overlaps Healthcare HVAC Design: ASHRAE 170 Ventilation, Pressure, Air Changes and fire/compartment logic in NFPA 101 Life Safety Code for Healthcare. Coordinate so infection barriers and life-safety barriers are both documented.

Barrier Types You Will Actually Build

• Soft containment — 6-mil (or policy-specified) polyethylene, taped seams, often Class III; not a substitute for Class IV/V critical barriers at the deck.
• Hard barriers — Stud-and-poly or fire-rated temporary walls for Class IV/V; must meet NFPA 241 expectations and firestop at penetrations when applicable.
• Anterooms — Required for Class V; best practice for many Class IV jobs adjacent to clinical care. Pressure cascade starts here.
• ECU / portable containment — Small-footprint HEPA-exhausted units when the entire activity fits inside the unit.
• Negative air machines (NAMs) — HEPA-filtered exhaust; count, placement, and manometer locations belong on the ICRA permit attachment.

Mold or water-damage remediation inside occupied shells often lands in Class IV/V territory; align remediation containment with the same barrier and pressure rules so scopes do not contradict each other.

Monitoring, Documentation, and Closeout

The permit is not a signature page—it is a control plan. Attach specifications, barrier drawings, NAM schedules, and verification methods (pressure log frequency, particulate sampling if used). Class III (Type C only), IV, and V require infection prevention (or designee) plus engineering inspection before downgrading or removing critical barriers.

Upon completion: terminal clean of surfaces and diffusers; negative air runs after dust-generating work until contaminants are flushed; barriers stay up until after that cleaning. Restore HVAC isolation only after IP/engineering release. Document airflow and exchange rates back to design intent.

Routine Environment of Care rounds should catch missing permits, open zipper doors, and manometers reading zero—before a surveyor does.

Breach Response

When containment fails—barrier tear, positive pressure, unfiltered exhaust, or visible dust outside the work zone—stop dust-generating work, notify infection prevention and engineering, and assess patient exposure in adjacent spaces. Stabilize pressure (add NAM capacity, seal breaches, vacate corridor if needed). Document the event, corrective actions, and whether enhanced cleaning or monitoring is warranted. Scope changes or discovery of biological or toxic materials trigger “stop work and re-assess” on the ASHE permit; do not resume on the old class.

Post-incident cleaning should follow evidence-based terminal protocols where surfaces were contaminated.

ICRA vs ILSM on the Same Project

ICRA protects patients from construction dust and pathogens. ILSM protects occupants when life-safety systems are impaired—fire alarm silence, sprinkler outage, compromised egress, smoke barrier openings tied to building work. One ceiling project can require both a Class IV ICRA and an ILSM checklist. They use different forms, different approvers, and different daily checks. Conflating them is how you get perfect negative pressure and no fire watch.

Run both tracks from the same job folder. Our overview is here: Healthcare Construction and Renovation: ICRA, ILSM, and Infection Control During Projects. Broader IPC context lives in Infection Control in Healthcare Facilities: The Complete Professional Guide.

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