Lath & Plaster Ceiling Replacement and Wall Re-Skim by a Plasterer in Richmond upon Thames

This project was carried out in a Victorian terraced house in Richmond upon Thames, TW9. The property retains a number of original period features, including the original lath and plaster ceilings that are common in homes of this era across the borough. The bedroom in question had been decorated with bold dark blue walls and a heavily patterned floral wallpaper, suggesting the room had been lived in for some time without any structural maintenance to the ceiling above. The ceiling had reached the end of its serviceable life and required full removal and replacement.

When our team arrived on site, the bedroom ceiling was in a serious state of deterioration. The original lath and plaster construction — a series of thin horizontal timber strips nailed across the ceiling joists with lime plaster keyed through the gaps — had almost entirely failed. The key, the hardened plaster that grips behind the laths, had broken down across the majority of the ceiling, leaving large sections loose and sagging. Several laths were visibly cracked or missing, and gaps had opened between strips exposing the joists above. The walls showed old painted plaster in reasonable condition, though surface imperfections and slight undulation were present throughout, indicating the walls would benefit from a full re-skim to bring them back to a flat, even surface ready for decoration.

The full scope of work for this bedroom in Richmond upon Thames covered two main areas: complete ceiling replacement and full wall re-skimming throughout the room. For the ceiling, the original lath and plaster construction was stripped entirely back to the bare joists. All loose laths, dried lime plaster debris, and dust were cleared from the ceiling void and the joist faces cleaned down. New 12.5mm tapered-edge plasterboard sheets were then fixed directly to the ceiling joists using drywall screws at the correct centres, with all board joints staggered to avoid continuous lines across the ceiling plane. Scrim tape was applied over every board joint and internal angle, and corner tape was used at the ceiling-to-wall junction. The full ceiling was then skimmed in Thistle Multi-Finish plaster, bringing it to a smooth, flat surface. For the walls, the existing painted plaster was assessed for soundness. The surface was abraded and a coat of diluted PVA bonding agent applied across all four walls to stabilise the substrate and improve adhesion before skimming. Each wall then received a scratch coat of Multi-Finish plaster, which was ruled off to remove high spots, followed by a finishing coat trowelled to a smooth, paint-ready surface. All internal angles were straightened using a clean angle trowel and the wall-to-ceiling junction was carefully finished throughout.

Before any plastering began, the room was fully protected. Furniture was moved and the floor covered with dust sheets, and the existing wallpaper was stripped back at the skirting line to allow the wall skim to run cleanly to floor level. The old lath and plaster ceiling was brought down carefully in sections to minimise the spread of lime plaster dust. Once the joists were exposed, they were checked for any movement or damage before boarding commenced. The walls were washed down to remove any loose paint and surface contamination. A diluted PVA solution was applied to all wall surfaces and left to go tacky before the first coat of plaster was applied, ensuring a firm bond throughout.

With the ceiling joists cleared and prepared, 12.5mm tapered-edge plasterboard sheets were lifted into position and fixed to the joists using drywall screws at 150mm centres along the edges and 200mm centres in the field of each board. Board joints were positioned to fall on joist centres wherever possible, and the layout was planned so that no two adjacent rows shared the same joint position. Once all boards were fixed, scrim tape was pressed into a thin base coat of jointing compound across every joint to prevent future cracking at the board edges. Corner tape was applied at the ceiling perimeter before skimming commenced. The entire ceiling was then skimmed with Thistle Multi-Finish plaster in two coats. The first scratch coat was applied across the full ceiling surface and ruled off with a feather edge to remove high spots and establish a flat plane. Once this coat had firmed up sufficiently, the finishing coat was applied and trowelled to a smooth, consistent surface, with the plasterer working in sections to maintain a wet edge across the full ceiling span. With the ceiling complete, attention turned to the walls. Each wall received a PVA wash allowed to go tacky, followed by a scratch coat of Multi-Finish plaster applied with a hawk and trowel. Once firm, the finishing coat was trowelled up to a flat, smooth surface. Internal angles were carefully cut in using an angle trowel, and the wall-to-ceiling junction was finished cleanly throughout the room.

The primary challenge on this project was managing the volume of debris generated by stripping a full lath and plaster ceiling in an occupied residential property. Victorian lime plaster ceilings are thick — often comprising a scratch coat, float coat, and finishing coat keyed into the laths — and when they fail, they produce significant quantities of sharp, dusty rubble. Containing this within the bedroom while protecting the rest of the property required careful sheeting out. A secondary challenge was the age and porosity of the existing wall plaster; old painted surfaces can draw moisture rapidly from fresh plaster, risking premature drying and poor adhesion if not properly treated before skimming begins.

To manage the ceiling debris, heavy-duty dust sheets were used throughout the room and a temporary dust barrier was erected across the doorway to prevent fine lime dust migrating through the property. The laths were brought down in controlled sections rather than all at once, allowing debris to be bagged and removed progressively. For the walls, a two-coat PVA bonding treatment was applied — an initial diluted wash followed by a second undiluted coat left to become tacky — ensuring the porous substrate was properly sealed before Multi-Finish plaster was applied. This controlled the suction evenly across all four walls and allowed the plaster to be worked and finished without premature stiffening.

The completed bedroom ceiling presents as a flat, smooth plasterboard surface skimmed in Thistle Multi-Finish, with no visible board joints or scrim lines. The wall-to-ceiling junction is clean and straight throughout the room, replacing the irregular edge left by the failed lath and plaster. All four walls have been re-skimmed to a consistent, even finish, removing the undulation and surface defects present in the original painted plaster. The room is now fully ready for mist coat and final decoration. The transformation from exposed timber laths and crumbling lime plaster to a clean, flat plastered room is clearly visible when comparing the before and after images from this Richmond upon Thames project.

The homeowner in Richmond upon Thames now has a bedroom ceiling that is structurally sound and flat, replacing a Victorian lath and plaster construction that had deteriorated beyond repair. The walls have been brought back to a consistent, smooth surface throughout the room, creating a uniform base for repainting or wallpapering. The project was completed within two working days, allowing the client to move furniture back in promptly and proceed with their redecoration programme without delay. The room has been entirely transformed from a tired, crumbling space into a clean, freshly plastered bedroom ready for its next chapter.

Replacing a lath and plaster ceiling in a Victorian property is not a straightforward task. The original construction contains decades of compacted lime plaster, often incorporating horsehair reinforcement, and the debris load when stripping is substantial. Incorrect boarding — poorly staggered joints, inadequate screw fixing, or scrim tape applied without a base coat — will result in cracking at board edges within months of decoration. Equally, skimming directly onto poorly prepared old wall plaster without adequate PVA treatment causes the fresh plaster to dry too quickly, leading to delamination and a chalky surface that will not hold paint. An experienced plasterer in Richmond upon Thames will carry out each stage correctly, ensuring the finished surfaces are stable and durable for years ahead.