AMRTTRAINING

    Free Mold Remediation Calculators, Checklists & Templates

    Field-ready tools for mold remediation work — air changes per hour and air scrubber sizing, cost estimating, containment volume, and PPE selection by Condition.

    Every mold job comes down to controlling the movement of spores — establishing containment, pulling the work area under negative pressure, and filtering the air fast enough to capture what you disturb. These calculators turn the S520 engineering-control principles into instant answers you can use before you open a wall.

    Start with the air changes per hour calculator to size air scrubbers and negative air machines, price the work with the mold remediation cost calculator, then use the containment volume and PPE tools below on the way out the door. Newer to the work? Our mold remediation training guide covers where to learn the field skills these tools assume.

    Calculators and templates

    Air changes per hour (ACH) calculator

    Convert CFM to air changes per hour, work back to the CFM a target ACH needs, and size how many air scrubbers or negative air machines the containment takes — plus poly and tape quantities.

    Mold remediation cost calculator

    Estimate a low-to-high range by affected square footage, materials, containment level, verification and rebuild, with every assumption listed.

    Mold remediation checklist

    Eight-phase printable field checklist following the S520 sequence — moisture source through post-remediation verification and closeout. Tick items on screen or print it for the clipboard.

    Mold remediation scope of work template

    Fill-in-the-blank scope covering Conditions by area, affected materials, containment, methods, PRV criteria, exclusions and sign-off. Type it in and print the filled form.

    GPP & psychrometric calculators (WRTTraining.com)

    Grains per pound, dew point and drying calculations for water damage work live on our sister site for the IICRC WRT exam.

    Quick field tools

    Containment Volume

    Room dimensions → cubic feet of the sealed work area

    Containment Volume

    2400 ft³

    Use this volume to size your negative air machine and verify air changes per hour.

    Frequently Asked Questions

    Containment volume is length × width × ceiling height, measured in cubic feet. It is the starting point for sizing negative air machines and calculating air changes per hour. Include only the sealed work area — the space enclosed by your critical barriers, not the whole structure.

    The ANSI/IICRC S520 standard requires engineering controls that maintain negative pressure and adequate air exchange inside the containment. You cannot size a negative air machine (NAM) or verify air changes per hour without first knowing the volume of the enclosed work area.

    No. Use gross room dimensions (length × width × height). The small volume displaced by contents and framing is negligible and building in a safety margin on your NAM sizing more than covers it.

    PPE Selector

    Condition 1/2/3 → recommended respirator, clothing, and controls

    Condition 2 — Settled spores

    Respiratory Protection

    Minimum N95 filtering facepiece (APF 10); upgrade to half-face P100 for dusty work.

    Protective Clothing

    Gloves and eye protection (goggles); disposable coveralls for larger areas.

    Controls & Procedures

    HEPA vacuum and damp wipe settled contamination; localized containment as needed.

    Condition 2 areas have settled spores but no active growth. Prevent re-aerosolization while cleaning.

    Guidance is based on the ANSI/IICRC S520. Always assess site-specific hazards and follow the OSHA Respiratory Protection Standard (29 CFR 1910.134), including fit testing and medical clearance for tight-fitting respirators.

    Frequently Asked Questions

    The ANSI/IICRC S520 scales PPE to the level of contamination. Minimum microbial work calls for an N95 respirator, gloves, and eye protection; larger or Condition 3 projects call for a half- or full-face respirator (or PAPR) with P100 filters, and disposable full-body suits with head and foot coverings.

    It depends on the assigned protection factor (APF) you need: N95 (APF 10) for limited work, half-face elastomeric with P100 (APF 10) for routine remediation, full-face (APF 50) for heavy exposure, and a PAPR (APF 25–1000) for the highest concentrations or workers who cannot pass a tight-fit test. Any tight-fitting respirator requires OSHA fit testing and medical clearance.

    Yes. Condition 1 (normal fungal ecology) generally needs no special PPE. Condition 2 (settled spores) warrants at least an N95, gloves, and eye protection. Condition 3 (actual mold growth) warrants upgraded respiratory protection and full disposable clothing, with the level scaled to the size of the affected area.

    A respirator only delivers its rated protection with a proper seal, so OSHA requires annual fit testing for tight-fitting respirators. Careful doffing prevents re-contaminating the worker — remove PPE inside the decontamination chamber, roll it inward, and HEPA-vacuum before exiting.