Internal Wall & Ceiling Finishes

Internal wall and ceiling finishes are the visible surfaces of rooms: lath and plaster in older buildings, plasterboard on timber or steel framing, suspended ceiling grids and tiles in commercial buildings, paint, wall coverings, textured coatings, timber panelling, wall tiles and acoustic panels. They are judged on appearance, but some failures are structural in effect: old lath and plaster ceilings and poorly fixed plasterboard ceilings can collapse, and textured coatings and paints in older buildings may contain asbestos or lead.

Finishes are assessed by space, since ceilings over beds, desks and corridors carry more consequence if they fall than those over storage.

What shortens life:

• Water from leaks and condensation.
• Building movement cracking joints and cornices.
• Services works that cut and patch ceilings.
• Vibration and roof works loosening old plaster.

Ceilings in older buildings deserve particular attention because their age, not their appearance, often decides whether they are safe.

Ceiling sagging and collapse

Lath and plaster ceilings hang by plaster keys pushed through the laths; as keys break with age, vibration and water, the ceiling sags and can fall in large sections. Plasterboard ceilings fixed with failing adhesive, too few fasteners or undersized battens, or soaked by leaks, sag and can drop without warning. Sagging ceilings are a safety finding.

Cracking

Cracks at plasterboard joints, cornices and corners come from timber shrinkage, seasonal movement and structural movement. Most are cosmetic; cracks that are wide, recurring or tapering may reflect foundation or structural movement.

Water damage and mould

Leaks from roofs, wet areas and services stain, soften and collapse ceilings; condensation in bathrooms and cold rooms grows mould on ceilings and walls.

Hazardous finishes

Textured coatings and some plasters, ceiling tiles and wall boards in older buildings contain asbestos; older paint contains lead. They are safe while intact but release fibres or dust when sanded, drilled or removed.

Suspended ceiling problems

Tiles stain from leaks and sag from humidity; grids are bent by trades; tiles are left out after works, breaking fire, acoustic and smoke performance where the ceiling is part of a system.

Heavy fittings such as light fittings, fans and speakers hung from plasterboard without proper support also pull ceilings down over time.

Fire-rated ceilings lose rating when cut for services.

On site

• Ceilings sagging, bulging or with cracks running along battens; cornices pulling away.
• Nail pops and cracks at plasterboard joints.
• Stains, softness and mould on ceilings.
• Textured ceilings and walls in older buildings.
• Flaking paint on older surfaces.
• Missing, stained or sagging suspended ceiling tiles.

In the records

• Asbestos register.
• Leak history.
• Previous ceiling repairs.

• Cracks running parallel at regular spacing on ceilings, following battens or joists.
• Ceiling fans and heavy fittings fixed to plasterboard alone.
• Patched and mismatched suspended ceiling tiles after services works.
• Bulges in ceilings below wet areas or roof leaks.

• Mould returning on ceilings soon after repainting.
• Old ceilings with fine cracks and slight bulges.

Recurring mould after repainting means the moisture cause has not been fixed.

Findings are graded by what they demand: safety (can hurt someone now), failure (failed and damaging the building), condition (distress present and progressing), lifecycle (renewal due on age and exposure), deadline (a regulator or ordinance sets the date), check (investigate before sizing works) and nil (cosmetic or stable).

A sagging ceiling is graded as safety even if it has not moved recently, because collapse gives little warning and falls on people below.

A building surveyor inspects, with a licensed asbestos assessor before any sampling or works on older finishes.

• Ceiling inspection from below and, where accessible, from the roof space or ceiling void, checking fixings, keys, battens and adhesives.
• Crack mapping with widths and patterns to separate cosmetic from structural cracking.
• Moisture and mould assessment where stains or mould appear.
• Hazardous materials sampling of textured coatings, older plasters, ceiling tiles and paints before work.
• Suspended ceiling survey where the ceiling forms part of a fire, smoke or acoustic system.

The report should identify any collapse risk, hazardous content, the cause of cracking and staining, and a repair or refurbishment plan.

Where ceilings are old and inaccessible from above, a small inspection opening can confirm their fixing.

Record which rooms sit under old or sagging ceilings, so that the most occupied rooms are made safe first and the others are scheduled.

• Ceiling securing: refix plasterboard with additional fasteners, or replace sagging lath and plaster ceilings, after propping where needed.
• Crack repair after any movement is resolved, with flexible joints where movement will recur.
• Leak and moisture fixes before redecorating, then repair or replacement of damaged boards.
• Mould treatment and improved ventilation.
• Hazardous materials: leave intact asbestos-containing finishes undisturbed and recorded, or remove by licensed contractors before works; stabilise or remove lead paint safely.
• Suspended ceilings: replace stained and missing tiles and straighten grids; restore ceiling systems that form part of fire or acoustic designs.
• Redecoration on cycle.

• Support heavy fittings from framing, not plasterboard.

• Ventilation improvements in bathrooms and laundries so ceilings do not grow mould again after repainting.

Ceiling repairs and replacements are priced by area, with propping and access, and in occupied buildings the cost of temporary relocation. Hazardous materials removal adds licensed removal, air monitoring and clearance. Suspended tiles are priced per tile or by area. Redecoration is by area on a cycle.

Collapse risks are immediate; hazardous materials are code compliance when disturbed; redecoration and ceiling replacement are lifecycle.

Ceiling refixing is far cheaper than repairs after a collapse.

• Australia. Plasterboard installation follows AS/NZS 2589; lead paint management follows AS 4361.2; asbestos-containing finishes are managed under work health and safety laws.
• United Kingdom. Plastering and drylining follow BS 8212 and BS EN 520; asbestos-containing textured coatings are managed under the Control of Asbestos Regulations 2012; lead paint follows HSE guidance.
• United States. Gypsum board application follows ASTM C840 and GA-216; lead-safe practices under the EPA Renovation, Repair and Painting Rule apply in pre-1978 housing; asbestos is regulated by OSHA and the EPA.

In all three countries, work that disturbs asbestos-containing finishes must follow asbestos rules, and in rental housing, landlords must keep ceilings and walls safe and free of hazards such as mould and lead dust under housing standards.

• Asbestos register covering finishes.
• Lead paint test results for older buildings.
• Leak history and repairs.
• Previous ceiling repairs or replacements.
• Records of works that disturbed finishes.

• Mould complaints.
• Records of heavy fittings installed on ceilings.
• Building age and renovation history.

• Records of ceiling repairs after leaks.