Blown / Loose-Fill Cellulose Insulation SWMS

Blown or loose-fill cellulose insulation installation involves pneumatically conveying treated paper-based fibre through hoses into ceiling cavities, wall cavities and crawl spaces using a mechanical blower unit. The work is classified as High Risk Construction Work under WHS Regulation 2011 r291 because installers routinely access confined ceiling crawl spaces, work near energised wiring and recessed downlights, and are exposed to elevated airborne dust concentrations including cellulose fibre, ammonium sulphate or borate fire retardants, and historical contaminants disturbed during entry. A Safe Work Method Statement is mandatory before work commences and must be developed in consultation with workers under WHS Act s47, kept available for inspection on site, and reviewed whenever controls fail or conditions change. This template addresses the full task sequence — pre-entry inspection, blower setup, hose management, cavity navigation and post-work decontamination — and aligns controls with the hierarchy under WHS Regulation r36.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where loose-fill is specified purely for thermal performance, substitute the design with externally applied batt or rigid board insulation accessed from outside the cavity, removing crawl space entry entirely.
2. 2Elimination — Isolate and lock out the entire roof-space electrical circuit at the switchboard before entry, eliminating live contact risk under AS/NZS 3000 clause 2.3 isolation requirements.
3. 3Substitution — Substitute borate-treated cellulose for ammonium-sulphate formulations to reduce acute respiratory irritation and corrosivity to metal fixtures, per safety data sheet selection under WHS Reg r328.
4. 4Engineering — Install temporary LED task lighting and crawl boards spanning joists across the full work path so installers never bear weight on plasterboard sheeting between joists.
5. 5Engineering — Use blower units fitted with variable-speed control and hose-end shut-off trigger so discharge can be stopped instantly if the operator loses footing or visibility.
6. 6Engineering — Provide forced cavity ventilation using a portable extraction fan ducted to outside air, reducing airborne dust and lowering cavity temperature during the task.
7. 7Administrative — Conduct pre-entry asbestos and hazardous material assessment per the Code of Practice: How to Manage and Control Asbestos in the Workplace before any pre-2004 ceiling cavity entry.
8. 8Administrative — Implement a two-person buddy system with external standby observer, radio communication, scheduled rotation every 30 minutes, and documented heat-stress monitoring against BoM forecast.
9. 9PPE — Issue P2 half-face respirators with fit-testing per AS/NZS 1715, disposable Type 5 coveralls, safety glasses to AS/NZS 1337.1, nitrile gloves and knee pads for sustained kneeling.
10. 10PPE — Upgrade to powered air-purifying respirator (PAPR) with P3 filter for cavities exceeding 35°C or where dust visibility falls below one metre during continuous discharge phases.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a suburban single-storey weatherboard retrofit under a state energy efficiency rebate, the two-person crew arrives to blow 250mm of cellulose into a 1960s ceiling cavity accessed through a 600x600 manhole in the hallway. At the pre-start brief on the tailgate, the supervisor opens this SWMS on a tablet and walks the installer through each hazard line. They confirm the switchboard has been isolated and tagged because the SWMS lists concealed wiring as a HIGH priority item, and they identify two recessed downlights from the floor plan that require IC-rated covers before discharge. The SWMS prompts an asbestos pre-check — the supervisor inspects the cavity with a torch from the hatch, sights vermiculite-free fibreglass batts, photographs the cavity and signs off the assessment row. Both workers fit-test their P2 respirators against the AS/NZS 1715 control listed, don Type 5 coveralls and sign the consultation register on page four. Thirty minutes into discharge the installer radios that cavity temperature is climbing and visibility has dropped below one metre. The standby observer refers back to the SWMS PAPR trigger threshold, halts work, swaps the half-face for a PAPR unit, and amends the live SWMS record with the control change, time and reason before resuming.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Code of Practice — Hazardous Manual Tasks

Frequently asked questions