Full House Re-Skim by a Plasterer in Westminster – Lambeth South London Project

This project was carried out on a Victorian terraced house in Lambeth, South London — a property type also common across Westminster and the wider SW1 postcode. The house was mid-renovation, with flooring stripped back to bare concrete and screed, skirting boards removed in sections, and the property cleared throughout. The front door, period timber frame and original door architrave confirmed the Victorian character of the building. The project formed part of a broader refurbishment programme, with plastering needed across the main reception room and hallway areas as a minimum.

Before work began, the walls throughout the ground floor showed the tell-tale signs of aged painted plaster that had been in place for decades. The plaster surface was uneven in places, with visible ridging and hollowing where previous coats had begun to detach from the substrate beneath. At the ceiling line, the old plaster had already been cut back or had broken away, leaving a rough, stepped edge where the walls met the ceiling. The inset photo clearly shows the ceiling prior to the skim — new plasterboard had been fixed across the ceiling joists using a taped and jointed grid pattern, with orange drywall tape visible at every board joint, confirming the boards were freshly installed and ready to receive a skim coat.

The scope of work covered a full re-skim of the ground floor reception room, including both the newly boarded ceiling and the existing walls. The ceiling had been re-boarded prior to our visit using 12.5mm plasterboard fixed directly to the joists, with all joints taped using fibreglass mesh tape before skimming. The walls, which retained their original plaster substrate, required a bonding preparation wash before the skim coats could be applied. Specific tasks included: preparation of the freshly boarded ceiling, including checking all screw fixings were countersunk flush and taping all board joints with jointing compound; applying a diluted PVA bonding coat to all existing plaster walls to reduce suction and improve adhesion of the new skim; applying a scratch coat of Thistle Multi-Finish across the ceiling, then trowelling back to a flat plane; applying a scratch coat and finishing coat to all walls, working one wall at a time to maintain a wet edge; ruling off and trowelling the ceiling and walls to a flat, smooth surface ready for decoration; and cleaning down all window reveals, door frames and the radiator recess area where plaster met existing surfaces.

Prior to skimming, the new plasterboard ceiling was checked across all fixing points to ensure no screw heads were proud of the board face — any raised fixings were driven flush before taping. All board joints were pre-filled with a thin layer of jointing compound and reinforced with orange fibreglass mesh tape, as visible in the inset photo. The existing wall plaster was brushed down to remove loose debris and dust from the renovation, then coated with a 4:1 PVA and water solution and allowed to become tacky before the skim was applied. This reduced the suction of the old plaster surface and prevented the new skim from drying out too fast.

The ceiling was skimmed first to avoid contaminating freshly worked walls with splatter or trowel marks from overhead work. A scratch coat of Thistle Multi-Finish was applied across the full ceiling area, spread firmly into the board and joints using a 14-inch finishing trowel, then ruled off with a feather-edge straight rule to remove any high spots and establish an even plane. Once the scratch coat had begun to firm, a second finishing coat was applied and trowelled back progressively as the plaster stiffened, using circular trowel passes to consolidate the surface. The result is visible in the main image — a flat, unmarked ceiling with no visible joint lines or board edges showing through. The walls were then skimmed in the same two-coat process. Each wall received a scratch coat applied at approximately 3mm thickness, ruled off vertically and horizontally to check for flatness, before the finishing coat was applied and closed off with a clean steel trowel. Particular care was taken around the wall-ceiling junction, where the old plaster had been cut back, to ensure a clean, straight arris was formed at the top edge of each wall. The radiator alcove wall and the wall sections flanking the front door opening were also skimmed flush and square.

The main challenge on this project was the junction between the freshly boarded ceiling and the existing walls. The old plaster had broken away or been cut back at ceiling height, leaving an uneven, stepped edge that needed to be made good before skimming. Running a clean, straight line where new ceiling plaster meets re-skimmed walls is one of the more demanding parts of a whole-room re-skim — any deviation shows clearly once the room is decorated with a paint finish. A secondary challenge was managing the suction difference between the new dry plasterboard on the ceiling and the old painted plaster on the walls, which required different preparation treatments for each surface.

To resolve the wall-ceiling junction, the broken plaster edge was undercut slightly and built back up with a small amount of bonding coat before the final skim was applied, giving a consistent thickness to work from at the top of each wall. This ensured the skim coat could be ruled off and trowelled flush right up to the ceiling line without a step or shadow forming. The suction difference between surfaces was managed by PVA-treating only the walls and leaving the new plasterboard ceiling dry — plasterboard naturally absorbs moisture from the skim at the correct rate without additional priming, whereas the old painted walls needed the PVA wash to open the surface and promote adhesion.

The completed ceiling is visible in the main image — a flat, consistent skim with no joint lines, board edges or trowel marks visible, ready to receive a mist coat and two coats of emulsion. The walls show a clean, even surface from skirting height to ceiling line, with straight arrises at all internal angles and door openings. The junction between the new ceiling skim and the re-skimmed walls reads as a continuous flat plane with no stepping or shadowing. The overall result is a room that is fully prepared for the next stage of the refurbishment — flooring, joinery and decoration.

The client, who was managing a full refurbishment of the Victorian terrace, needed the plastering completed within a tight programme so that the decorating trade could follow on without delay. All ground floor walls and the newly boarded ceiling were completed within two days, leaving surfaces that were smooth, flat and fully dry within four to five days — ready for the decorator to apply a mist coat of diluted emulsion. The client confirmed the finish met the standard required and that the decorating phase started on schedule.

A full house re-skim on a Victorian property mid-renovation involves working across multiple different substrates — new plasterboard, old painted plaster and rebuilt edges — all within the same room. Each surface behaves differently under the trowel and requires a different preparation approach. Applying the same treatment to all surfaces will result in either delamination, cracking or patchy suction that shows through the finished paint. Managing the timing of a two-coat skim — knowing when to apply the second coat and when to close off the surface — is a skill that comes from repetition on real projects. Rushing the close, or leaving it too long, both produce a surface that will need additional work before it can be decorated.