HSG264 material assessment scoring

The four scoring variables

HSG264's material assessment algorithm scores four variables, each on a 1–3 scale. The four scores are summed for a total between 4 and 12.

• Product type — e.g. reinforced composites (1), AIB / millboard / paper (2), thermal insulation / sprayed coatings / loose fill (3)
• Extent of damage / deterioration — good condition (0), low damage (1), medium damage (2), high damage (3)
• Surface treatment — composite reinforced (0), enclosed / sealed (1), unsealed AIB / encapsulated lagging (2), unsealed lagging / sprayed coating (3)
• Asbestos type — chrysotile (1), amphibole excluding crocidolite (2), crocidolite (3)

Interpreting the total score

HSG264 groups the totals into broad risk bands. These aren't legal thresholds — they're a guide for prioritising action.

• 10 or more — high potential to release fibres if disturbed
• 7 to 9 — medium potential
• 5 or 6 — low potential
• 4 — very low potential

Material vs priority assessment

The material assessment is about the ACM itself — what it is, what condition it's in. The priority assessment is about how the building is used — occupancy, activity, maintenance frequency.

Both feed the duty-holder's overall risk score. HSG264 expects the surveyor to provide the material assessment; the duty-holder typically completes the priority assessment.

Worked example

AIB ceiling tile in a corridor, low surface damage, painted, chrysotile only. Product type 2 + damage 1 + surface treatment 1 (enclosed/sealed via paint) + asbestos type 1 = total 5. Low potential to release fibres — manage in place with monitoring.

How AsbestosSurveyPro scores ACMs

AsbestosSurveyPro builds the four HSG264 scoring variables directly into the ACM capture form, calculates the total automatically, and prints the breakdown into the PDF report. No spreadsheets, no manual sums, no transcription errors.