Method Statement: Acoustic PET Felt Wall and Ceiling Tile Installation (Soft-Fit) – Method Statement

Overview

This method covers the end-to-end installation of acoustic polyester (PET) felt tiles on walls and ceilings within collaborative office/workplace zones. It includes substrate condition verification, surface wiping, setting-out of layout and patterns, low-VOC contact adhesive spray application, tile placement and compression rolling, pattern seam alignment checks, precise cutouts for architectural lighting/sockets, edge trim profile execution, and final clean/inspection records.

Inclusions

• Supply, offloading, storage, and protection of PET felt acoustic tiles and trims.
• Substrate inspection and preparation (wiping, dust removal, local filling/spot priming where required by manufacturer).
• Set-out and datum establishment, pattern alignment, and seam control.
• Low-VOC contact adhesive spray application to substrate and tile backs (contact bonding) in accordance with manufacturer data.
• Compression rolling, edge finishing, cutouts, and penetrations.
• Quality control, ITP compliance, as-built records, O&M handover.

Exclusions

• Structural works or framing; suspended grid ceilings; major substrate leveling or plastering.
• Firestopping, acoustic backing beyond PET tiles, or MEP works other than coordination and safe isolation for cutouts.
• Painting or decoration outside the immediate works area.

Key Performance Targets [Verify per project specifications]

• Seam gap: ≤ 1 mm; step/lippage between adjacent tiles: ≤ 0.5 mm.
• Planarity: deviation ≤ 2 mm under a 2 m straightedge for finished surface.
• Pattern/datum alignment tolerance: ± 2 mm over 10 m; joints in straightness: ± 1 mm over any 2 m.
• Adhesive coverage: visually ≥ 90% on both mating faces; combined coat weight typically 50–80 g/m².
• Environmental conditions during bonding: substrate/ambient 15–30°C; RH 30–70%; substrate moisture within manufacturer limits.

Approvals and Documentation

• Approved shop drawings, layout/pattern drawings, color schedule, and samples/mock-up sign-off.
• Approved Method Statement, ITP, and Task Risk Assessment.
• SDS/TDS for adhesives, primers, cleaners available on site.
• Coordination with MEP: confirm locations/heights for lighting, sockets, and penetrations.

Substrate and Environmental Conditions

• Substrate must be structurally sound, clean, dry, smooth, and free of dust, oil, release agents, laitance, and loose paint.
• Flatness: deviation ≤ 3 mm under 2 m straightedge before installation; defects to be locally filled/sanded/primed as required by manufacturer [Verify].
• Moisture: for concrete/masonry, surface dry with no free moisture; where tested, in-situ RH ≤ 75–85% [Verify per adhesive]. For gypsum board, visually dry with stable joints.
• Temperature/RH: Maintain 15–30°C and 30–70% RH for 24 h before, during, and 48 h after installation [Verify per adhesive TDS].
• Electrical circuits to be isolated and locked out where cutouts will be performed; verify dead before work.

Materials Conditioning and Protection

• Condition PET panels in space for ≥ 24 h to acclimate to temperature/RH.
• Protect adjacent finishes with masking and polythene; establish overspray control zones and ventilation plan.

Tools and Access

• Access equipment inspected and tagged; MEWP permits where applicable.
• Calibrated laser/hygrometer and moisture meter available.

Mock-Up (If Required)

• Install minimum 4–6 m² mock-up including a seam, an internal/external corner, one socket/light cutout, and an edge trim for visual and bond evaluation. Record settings and approved standards for the main works.

Principal Hazards and Controls

• Hazard: Aerosol/solvent vapors from contact adhesive (flammability and inhalation).
• Consequence: Fire/explosion; respiratory irritation/CNS effects.
• Engineering/Procedural Control: Use low-VOC, non-flammable/water-based adhesive where specified [Verify]. If solvent-based, prohibit ignition sources; ensure ventilation to maintain vapors well below 10% LEL; use local exhaust or air movers (target ≥ 6 air changes/hour in work zone). Decanting not permitted; keep canisters upright; bond only after flash-off. No hot works in vicinity.
• Required PPE: Nitrile gloves, chemical splash goggles, long sleeves; if solvent-based, half-mask respirator with organic vapor cartridges per SDS and exposure assessment.
• Collective Preventive Measure: Workface segregation and signage; intrinsically safe lighting/equipment if required.

• Inspection/Permit/Supervision: HSE to verify SDS controls; daily prestart check; VOC/LEL monitoring if solvent-based; PTW if working in confined/poorly ventilated spaces [Verify per project HSE plan and local regulations].

• Hazard: Working at height (ceilings, high walls) using ladders/MEWP/towers.

• Consequence: Falls causing serious injury or fatality.
• Engineering/Procedural Control: Prefer MEWP or mobile towers over ladders. Ladders only for short-duration, three-point contact work. Guardrails/toe boards on towers; MEWP operated by certified personnel; maintain exclusion zone.
• Required PPE: Hard hat, safety footwear, fall-arrest harness with lanyard when required by risk assessment/MEWP type.
• Collective Preventive Measure: Edge protection on platforms; spotter for MEWP.

• Inspection/Permit/Supervision: PTW for WAH; pre-use inspection tags; supervisor sign-off.

• Hazard: Utility knife/cutting operations for tiles and trims.

• Consequence: Lacerations; eye injury from offcuts.
• Engineering/Procedural Control: Use sharp blades; cut on stable bench with straightedge; retract blades when not in use; cut-resistant mats.
• Required PPE: Cut-resistant gloves (EN 388 level appropriate), safety glasses.
• Collective Preventive Measure: Designated cutting area; blade disposal container.

• Inspection/Permit/Supervision: Supervisor to brief at TBT; periodic checks.

• Hazard: Live electrical circuits at sockets/lighting.

• Consequence: Electric shock, burns, arc flash.
• Engineering/Procedural Control: Implement LOTO; verify dead using approved tester; cover exposed conductors; reinstate only after trims/plates fitted.
• Required PPE: Insulated gloves as required, eye protection.
• Collective Preventive Measure: Temporary blanks/covers on boxes; barriers.

• Inspection/Permit/Supervision: LOTO permits; MEP supervision; test before touch records.

• Hazard: Manual handling of panels and canisters.

• Consequence: Strains/sprains; crush injuries to toes/fingers.
• Engineering/Procedural Control: Team lifts; use panel carriers; store canisters below shoulder height; follow weight limits.
• Required PPE: Safety footwear with toe protection; gloves.
• Collective Preventive Measure: Mechanical aids where feasible.

• Inspection/Permit/Supervision: Manual handling briefing; spot checks.

• Hazard: Overspray causing slips or surface contamination.

• Consequence: Slips, rework, finish damage.
• Engineering/Procedural Control: Mask thoroughly; use drop sheets; clean immediate overspray with approved remover tested on sample.
• Required PPE: Gloves, safety glasses.
• Collective Preventive Measure: Restricted zone and walk-off protection.

• Inspection/Permit/Supervision: Housekeeping inspections each break.

• Hazard: Noise/vibration from equipment and MEWP.

• Consequence: Hearing damage; nuisance.
• Engineering/Procedural Control: Use low-noise equipment; limit hours; maintain equipment.
• Required PPE: Hearing protection if levels > 80 dBA.
• Collective Preventive Measure: Acoustic barriers if required.

• Inspection/Permit/Supervision: Noise monitoring as needed.

• Hazard: Dust/fibers during cutting.

• Consequence: Respiratory/eye irritation.
• Engineering/Procedural Control: Score-and-snap technique; local extraction; HEPA vacuum cleanup.
• Required PPE: Safety glasses; dust mask/respirator if required by assessment.
• Collective Preventive Measure: Isolate cutting area.

• Inspection/Permit/Supervision: HSE spot checks.

• Note: Where exact controls depend on local law or project HSE plan, implement and verify: [Verify per project HSE plan and local regulations].

Controls for Environmental Protection

• VOC Emissions:
• Select low-VOC adhesive compliant with SCAQMD Rule 1168 or local equivalent [Verify].
• Ventilation plan to dilute emissions (target ≥ 6 ACH in work zone); schedule works off-hours if required.

• Maintain closed containers; minimize spray time; no bulk decanting.

• Overspray and Waste:

• Masking to protect adjacent surfaces; use spray shields.
• Collect overspray-contaminated masking for disposal per SDS; do not wash to drains.

• Use drip trays under canisters; spill kit available.

• Waste Segregation and Recycling:

• Segregate PET felt offcuts for recycling where facility exists; otherwise dispose as non-hazardous solid waste.

• Adhesive cans/canisters treated as hazardous/special waste per SDS; arrange licensed collection.

• Noise and Nuisance:

• Limit to permitted hours; use low-noise equipment; maintain good housekeeping.

• Material Storage:

• Store PET tiles flat, dry, off-floor; protect from direct sunlight and moisture.

• Adhesive canisters stored in cool, ventilated area; temperature per SDS (commonly 10–30°C) [Verify].

• Energy and Carbon:

• Batch work to reduce rework/overspray; optimize layout to reduce offcuts; verify quantities before spraying to limit waste.

• Records:

• Keep VOC declarations, waste transfer notes, and recycling receipts in the environmental file.

QA Inputs

• Approved samples/mock-up sign-off; product data including NRC per ISO 11654/ASTM C423 and fire class per BS EN 13501-1.
• Adhesive SDS/TDS indicating compatibility with PET felt and substrate; VOC compliance statement.

In-Process Controls

• Substrate tolerance and dryness recorded before start.
• Adhesive coverage verified visually (≥ 90% both faces). Record batch numbers and application times.
• Environmental conditions logged at start/mid/end of shift (temp/RH). Maintain within TDS limits.
• Seam and pattern checks at every 2 m and at room edges/corners.

Acceptance Criteria [Verify per project specifications]

• Visual finish: uniform color/texture; no staining, bubbles, puckers, or telegraphing substrate defects.
• Planarity: ≤ 2 mm under 2 m straightedge (finished surface).
• Joints: gap ≤ 1 mm; lippage/step ≤ 0.5 mm.
• Alignment: with datum/grid within ± 2 mm over 10 m; edges parallel/perpendicular within ± 2 mm.
• Bond: no edge lift or mid-panel debonding after 24 h; field peel check satisfactory compared to approved mock-up or TDS. Where quantified testing is required, use ASTM D903 on a sacrificial strip per project QA plan.

Hold and Witness Points

• Substrate inspection (H).
• Mock-up approval (H).
• Initial adhesive application and first area installation (W).
• Final inspection and 24 h bond check (W).

Records

• ITP checklists; substrate/prestart inspections; environmental logs; adhesive batch/area logs; mock-up approval; NCR/CAR (if any); as-built drawings/markups; O&M manuals including cleaning guidance.

Attached/Referenced Forms and Documents

• Substrate Inspection Checklist (walls/ceilings)
• Adhesive Application Log (batch, area, time, flash-off)
• Environmental Conditions Log (Temp/RH by area)
• Mock-up Approval Form
• In-Process Installation Checklist (seams, alignment, rolling)
• Cutout/Penetration Register (LOTO reference)
• Edge Trim Inspection Sheet
• Final Inspection & Punch List Template
• Waste Transfer Notes and VOC Declarations
• O&M Manual (cleaning and maintenance guidance for PET felt)