Ceiling Replacement & Full House Re-Skim by a Plasterer in Greenwich

This project was carried out at a Victorian terraced house in Lambeth, South London, close to the Greenwich borough boundary. The property showed all the hallmarks of a period home that had undergone previous rewiring and general wear over many decades. The house was occupied and the owners were looking to fully refresh the interiors ahead of redecoration. The ceilings throughout had reached the end of their serviceable life and required full replacement rather than a surface skim alone.

The collage of images tells a clear story of the ceiling's condition before work began. The bottom-right photograph shows the ceiling had been stripped back entirely, revealing bare timber joists with old tongue-and-groove boarding still partially attached. Electrical cables were left exposed running between the joists, indicating the property had recently undergone a rewire. The old lath and plaster or board material had been removed, leaving a completely open void. In the bottom-left image, the replacement plasterboard has been fixed to the joists but the chased electrical channels and board joints are still raw and visible, with the ceiling awaiting its skim coat.

The scope of work covered the full ceiling replacement across at least one room of this Victorian terraced house, with a re-skim applied to the walls as part of a broader full house re-skim programme. The specific tasks carried out included: stripping out the failed existing ceiling material back to the bare timber joists; routing electrical cables to ensure they were safely positioned behind the new board line; fixing new 12.5mm plasterboard directly to the existing ceiling joists using appropriate drywall screws at correct centres; taping and jointing all board joints and screw heads with Thistle joint filler and paper tape to prevent cracking at the board joints after skimming; applying a bonding coat wash to the plasterboard surface where necessary to regulate suction before the finish coat; skimming the new ceiling with two coats of Thistle multi-finish plaster — a scratch coat followed by a tighter finish coat worked to a flat, even surface; re-skimming the walls to match the new ceiling level, ensuring a consistent surface throughout the room ready for decoration.

Before any plaster was applied, the exposed joist void was carefully inspected to confirm all electrical cables had been clipped and secured safely out of the board plane. The new 12.5mm plasterboard sheets were fixed to the timber joists using 42mm drywall screws at approximately 150mm centres to the edges and 200mm to the field, ensuring no board movement. All board joints were reinforced with paper jointing tape and filled flush with the board face. Screw dimples were also filled. The board surface was then misted with a diluted PVA solution to even out the suction across the fresh plasterboard before the multi-finish was applied.

Once the boards were fully prepared and the jointing compound had set hard, the skim coat process began on the ceiling. The first coat of Thistle multi-finish was applied across the full ceiling area using a large plastering trowel, working the plaster firmly into the surface to key well with the taped joints beneath. This scratch coat was laid at approximately 2–3mm thickness and ruled off to remove any high spots before it began to firm up. A second, thinner finishing coat was then applied before the first coat had fully set, allowing both coats to be worked together and trowelled tight. As the plaster reached the correct stage of set, the ceiling was finished using a clean, dampened trowel to close the surface, producing the flat, tight result visible in the top photograph of the collage. The walls were re-skimmed using the same two-coat multi-finish method, with the base coat applied to stabilise the existing painted plaster substrate, followed by the finishing coat worked level with a feather edge and finished by trowel.

The primary challenge on this project was the exposed joist ceiling with active electrical cables running through the void. The rewire had left cables that needed to be carefully routed and clipped before boarding could begin, as any cable sitting proud of the joist face would prevent the plasterboard from sitting flush. Additionally, the old ceiling void had accumulated dust and debris between the joists which needed clearing to allow proper access for clipping cables and fixing noggins where board joins landed mid-span.

Prior to fixing any boards, all electrical cables were traced through the joist void and clipped firmly to the sides of the joists, well clear of the board fixing line. Where cables passed through joists, grommets were checked to ensure the cable sheathing was protected. Noggins were cut and fixed between joists at all mid-span board joints to provide a solid fixing point. This preparation ensured the plasterboard could be fixed flat to the joists across the full ceiling area without obstruction, giving a level base for the skim coat that follows.

The top photograph in the collage shows the completed ceiling after skimming — a flat, smooth surface with no visible board joints, tape lines or screw marks showing through. The ceiling has been finished consistently across its full span, with a clean line where the ceiling meets the re-skimmed walls. The pendant light drop is the only penetration visible, confirming the electrical rough-in was completed before boarding. The room is now fully ready for mist coat and decoration.

The homeowners in this Lambeth property had been living with a stripped-out ceiling void for several weeks while their rewire was completed. Once the plastering team attended, the ceiling was boarded and skimmed within two days, transforming the room from a bare joist void to a freshly plastered, paint-ready surface. The owners were able to proceed directly to decoration without any further remedial work required, completing the interior refresh they had been planning.

A ceiling replacement on a Victorian property that has been rewired requires co-ordination between the plastering and electrical trades before boarding begins. Fixing plasterboard over unsecured cables, or boarding to joists without mid-span noggins at board joints, leads to cracking and movement within months of completion. The two-coat skim process also demands correct timing — applying the second coat too early or too late results in drag marks or delamination. These are not risks worth taking on a ceiling that will cost more to repair than to do correctly the first time.