Raised Timber Floor Safe Work Method Statement

Confined space classification depends on specific characteristics of subfloor areas. Under WHS Regulations, confined space is defined as enclosed or partially enclosed space not designed primarily for human occupancy, with restricted entry/exit, risk of harmful airborne contaminants, oxygen deficiency, flammable atmosphere, or engulfment potential. Many subfloor areas meet these criteria requiring formal confined space procedures. Indicators suggesting confined space classification include headroom less than 1 metre preventing easy movement and egress, limited access points restricting emergency evacuation, poor natural ventilation creating potential for atmospheric hazards, and difficulty conducting emergency rescue if workers are injured. Where confined space determination applies, implement formal entry procedures including atmospheric testing before entry measuring oxygen (must be 19.5-23%), combustible gas levels (below 5% LEL), and toxic gases, continuous forced ventilation during work, standby person stationed outside space maintaining contact with workers inside, written entry permit system, and emergency rescue arrangements including equipment and trained personnel. Brief all workers on confined space hazards and procedures. Document confined space classification and rationale in site SWMS. For marginal cases seek advice from safety professionals or WorkSafe authorities. Never assume subfloor space is safe without assessment - asphyxiation incidents occur in seemingly innocuous confined spaces. Better to implement formal procedures unnecessarily than fail to protect workers in actual confined space conditions.

Subfloor work creates extreme manual handling challenges due to confined spaces preventing proper lifting technique. Mechanical aids substantially reduce injury risk. Portable conveyor systems or slide tracks allow transporting bearers and joists from storage to subfloor entry points eliminating sustained carrying. Low-profile trolleys with large wheels allow moving materials within subfloor spaces where headroom permits. Adjustable props and temporary supports hold bearers at installation height during leveling and fixing, eliminating sustained manual holding of heavy members. Crowbars, pry bars, and pipe rollers serve as simple mechanical aids for maneuvering bearers between piers, reducing lifting forces by allowing rolling or sliding rather than lifting. Position material delivery strategically with suppliers placing materials close to installation points minimizing manual transport distances. Consider telehandler or small excavator for placing heavy bearers from above where site access permits, reducing or eliminating work from confined subfloor spaces. Establish bearer assembly areas outside confined spaces where practical, working in better conditions and lowering completed bearer sections into position. Brief workers on available mechanical aids and establish mandatory use policies eliminating unnecessary manual handling. Remember that even with mechanical assistance, awkward positions in confined spaces increase strain compared to open working areas. Implement task rotation between subfloor work and above-ground activities allowing recovery. Monitor workers for manual handling injury signs including grimacing, awkward postures, reports of discomfort, immediately reviewing procedures if strain evident. Investment in mechanical aids pays substantial returns through injury prevention and improved productivity.

Falls through incomplete floor structures create serious injury risk during raised timber floor construction. Prevention requires multiple complementary controls. Progressive flooring installation is most effective approach - install flooring sheets or strip flooring progressively as joists are completed creating continuous walking surfaces eliminating gaps. This approach prevents most fall-through incidents. Where progressive flooring is not practical, install temporary walkways using scaffold planks or plywood sheets across joists at strategic locations providing safe access without walking on narrow bearers or joists. Space walkways to allow access throughout work area. Mark all floor openings for services or access hatches with high-visibility barriers preventing inadvertent approaches. Use physical barriers such as chains or safety mesh around openings rather than relying on markings alone. Install adequate lighting throughout floor structure making gaps and hazards clearly visible - workers carrying materials with obstructed vision depend on good visibility. Establish and enforce designated safe pathways, prohibiting walking in areas without temporary walking surfaces. Brief workers daily on floor opening locations and changes from previous day. Where floor height exceeds 2 metres, install temporary edge protection around floor perimeter preventing falls from edges. Consider working from above where feasible installing joists from scaffold or elevated work platforms rather than entirely from below, reducing exposure to gaps. For extensive floor areas, establish exclusion zones preventing access to incomplete sections until safe walking surfaces exist. Document floor completion progress and identify remaining hazardous areas in toolbox meetings. Remember that experienced workers can misstep when distracted or carrying materials - physical controls preventing falls are essential rather than relying on awareness alone.

AS 3660 establishes termite protection requirements for buildings offering several options with different worker safety implications. Physical barriers use materials termites cannot penetrate including stainless steel mesh or graded stone barriers installed around building perimeter. These create no chemical exposure for workers but require careful installation to maintain continuity. Treated timber uses timber products pressure-treated with preservatives such as CCA, ACQ, or copper azole. This exposes workers to chemical preservatives requiring PPE including gloves for handling and respiratory protection when cutting, but provides long-term protection built into materials. Chemical soil treatments involve licensed pest controllers applying termiticides to soil beneath and around buildings creating chemical barrier. This creates highest chemical exposure risk requiring coordination between pest control and construction activities, adequate ventilation periods before workers enter treated areas, and respiratory protection if premature entry necessary. For worker safety, physical barriers are preferable option eliminating chemical exposure, followed by treated timber with manageable PPE requirements, with chemical soil treatment creating greatest exposure requiring careful management. If chemical treatments are necessary, coordinate application timing when construction workers are off-site, implement exclusion periods per pesticide label requirements (typically 24-48 hours), ensure adequate ventilation before worker re-entry, provide Safety Data Sheets to construction workers, and brief workers on chemical hazards. Select termite protection strategy early in project allowing proper planning rather than last-minute decisions. Remember that termite protection is mandatory under Building Code making compliance essential, but worker protection during installation is also mandatory under WHS legislation requiring selection and management of protection method considering worker safety alongside termite protection effectiveness.

Subfloor spaces in summer heat create extreme heat stress risk due to confined conditions preventing natural cooling, lack of air movement concentrating heat, radiant heat from ground surface, and limited ability to escape heat during work periods. Temperature in unventilated subfloor spaces can exceed 45°C making work dangerous. Prevention requires multiple controls. Schedule subfloor work during coolest parts of day, starting early morning and avoiding peak afternoon heat. Implement work-rest cycles with workers alternating between subfloor work and above-ground tasks in cooler conditions. Duration of subfloor work periods decreases as temperature increases - work periods should not exceed 45 minutes in extreme heat followed by minimum 15-minute recovery in shade. Install forced ventilation using portable fans or blowers creating air movement through subfloor spaces, substantially reducing effective temperature. Position fans to create cross-flow ventilation through confined spaces. Provide immediate access to cool drinking water with workers drinking minimum 250ml every 15-20 minutes during hot conditions regardless of thirst. Do not rely on workers to self-manage hydration as judgment is impaired during heat stress. Brief workers on heat stress symptoms including confusion, lack of coordination, excessive sweating or cessation of sweating, nausea, and headaches. Establish buddy system with workers monitoring each other for symptoms. Empower workers to cease work if heat stress symptoms occur without penalty. Provide shaded rest areas with fans for recovery periods. Consider providing cooling vests or other personal cooling equipment for extreme conditions. Monitor weather forecasts and implement work restrictions when predicted temperatures exceed safe working limits - some conditions make subfloor work impossible requiring work postponement or alternative approaches. Remember that heat stress impairs judgment creating safety risk beyond direct heat effects - workers in heat stress make poor decisions increasing incident risk. Never pressure workers to continue in heat stress conditions as heat stroke can cause permanent injury or death.