Wall Skimming & Ceiling Re-Skim by a Plasterer in Croydon – Victorian Terraced House Landing

This project was carried out at a Victorian terraced house in Lambeth, South London, a short distance from the CR0 postcode area of Croydon. The property features original pine floorboards, a traditional staircase with turned balusters and newel posts, and period-style panel doors — all typical of late Victorian terraced housing stock across South London. The upper landing and stairwell area had clearly not been replastered for many years and was being fully stripped back and renovated as part of a whole-house refurbishment.

Both images show the upper landing and stairwell area in a heavily stripped-back state prior to plastering. Wallpaper had been removed from all walls, leaving the plaster surface patchy, with large areas of the old finish coat missing entirely. The exposed substrate shows a mix of bare bonding coat and original lime-based plaster beneath. The ceiling shows extensive uneven patching — darker brown areas indicate where previous repairs or fresh bonding had been applied, sitting alongside older, lighter sections of existing plaster. The overall wall surface is rough and inconsistent, with flaking residue and torn paper backing still visible across large sections of all walls. The substrate was clearly too variable to paint directly over and required a full skim coat throughout.

The full scope of work covered the entire upper landing and stairwell, including all four wall faces and the ceiling. Given the scale of surface inconsistency across both walls and ceiling, every surface required preparation and a full skim coat of multi-finish plaster. The walls had been stripped of wallpaper but the old finish coat had come away in large patches, leaving an uneven substrate with varying suction levels across the same wall face. The ceiling had already received patching in several areas — visible as the darker brown sections in the images — but the overall surface was too uneven to leave as a painted finish. All surfaces therefore needed to be brought to a consistent, flat plane before skimming. The work included: stabilising all wall surfaces with a PVA bonding solution to even out suction before skimming; skim coating all four walls on the landing from skirting to cornice; skim coating the full ceiling area including tying in all previously patched zones; and ensuring clean plaster lines around the existing period coving and door architraves. No plasterboarding was required as the underlying substrate, once stabilised, was sound enough to receive a direct skim.

Before any multi-finish plaster was applied, all wall surfaces were assessed for suction variance. Where old wallpaper backing paper remained, it was wetted and removed to expose the substrate beneath. A diluted PVA bonding agent was brushed across all walls and the ceiling to consolidate loose surface material and even out the absorption rate between the bare bonding coat sections and the older painted plaster areas. This step was critical — without it, the fresh skim coat would dry at different rates across the same wall, leading to cracking or a patchy finish. The PVA was allowed to reach a tacky but not fully dry state before plastering began.

With all surfaces primed and the PVA at the correct tack, multi-finish plaster was mixed to a smooth, lump-free consistency and applied to the walls in full-length vertical passes using a steel trowel. Each wall received a scratch coat first — applied at approximately 2–3mm thickness — which was cross-scratched lightly to provide a key for the finishing coat. Once the scratch coat had stiffened sufficiently, the finishing coat was applied and trowelled flat, working from the coving line down to the skirting board on each wall face. Around the door architraves and the stairwell opening, care was taken to keep plaster edges crisp and aligned with the existing timber. The ceiling followed the same two-coat process. The previously patched areas on the ceiling — visible as the darker brown zones in the images — were feathered into carefully so the final skim coat sat at a consistent level across the whole ceiling plane. A wet brush was used to keep the leading edge of plaster workable during trowelling, and each surface was finished with tight circular trowel passes to close the surface and eliminate trowel marks before the plaster set.

The main challenge on this project was the highly variable suction across both the walls and ceiling. Where old wallpaper had been stripped, sections of the finish coat had lifted away entirely, leaving bare bonding coat exposed directly next to areas where the original painted plaster remained intact. These two surfaces absorb moisture from fresh plaster at very different rates — bare bonding soaks water in rapidly, while painted plaster barely absorbs at all. Applying a skim coat across such a mixed substrate without preparation would cause the plaster to dry unevenly, leading to premature cracking or a finish that shows visible joins between old and new material.

To address the suction variance, a PVA bonding solution was applied across all surfaces before plastering began. The ratio of PVA to water was adjusted slightly depending on the porosity of each area — more diluted over the painted sections, slightly stronger over the bare bonding coat zones. This brought the overall suction of each wall and the ceiling to a consistent level, allowing the multi-finish plaster to behave uniformly during application and trowelling. The two-coat approach — scratch coat followed by finish coat — also helped build a flat plane across the irregular substrate before the final surface was closed off.

Both images capture the project at the prepared and part-skimmed stage, showing the full extent of the work required before final completion. The ceiling across the landing shows the fresh skim coat bringing together the previously patched zones and the original plaster into a single, continuous surface. The walls show the stripped substrate ready and primed for skimming. Once fully completed, all wall and ceiling surfaces across the landing and stairwell were flat, consistent and ready for decoration — with clean plaster returns around the period coving, door frames and stairwell opening.

The client was having the whole house refurbished before moving in, and needed all plastering across the landing and stairwell completed within a tight programme to allow decorators to follow on. The walls and ceiling were handed over flat, fully set and ready to paint within the agreed timeframe. The client confirmed that the decorators were able to start directly after the plaster dried without any need for additional filling or remedial work between trades.

Skimming over a mixed substrate — bare bonding coat sitting alongside old painted plaster — is one of the more technically demanding situations in plastering. Without correctly assessing and treating the suction levels across each surface, a skim coat will dry unevenly, crack along the boundaries between old and new material, or show visible patching once painted. Getting the PVA preparation right, timing the scratch coat correctly and knowing when to apply the finishing coat are all judgement calls that come from practical experience on similar projects. Attempting this type of work without that experience typically results in a finish that fails within months of painting.