Water-damaged plaster repairs.

The job in context

A plaster repair does not fix the source of a leak. Let us know what caused the moisture, what has already been repaired and whether the lining is still damp. That information helps distinguish a surface repair from a section that may need replacing.

Signs of water damage in plaster

Water damage often starts as a faint yellow or brown ring on the ceiling. Over time, these stains grow larger. You might notice the paint bubbling or peeling away from the surface as moisture pushes through the board from behind.

In more severe cases, the plasterboard becomes soft to the touch or starts to sag. If the ceiling bows downward, it indicates the internal structure of the board has failed. This usually means the affected section needs full replacement rather than a simple patch.

The repair process

The process begins by removing any soft or crumbling plaster. We cut back to the nearest solid framing to ensure the new piece of board is securely supported. This prevents the new patch from sagging in the future.

Once the new sheet is installed, we apply tape and jointing compound to the seams. This is done in multiple layers. Each coat must dry fully before we sand it back to a flat finish that matches the rest of the wall or ceiling.

Factors that affect the job

Access plays a large role in how a job proceeds. High ceilings or rooms with fixed furniture may require more setup time. The condition of the existing timber framing also matters, as wet frames may need to dry out before new plaster is attached.

Drying times are dictated by the weather and ventilation. Setting compound cannot be sanded or painted until it is completely dry. Other trades, such as painters, can only start their work once the final sanding is finished and the dust is cleared.

Preparing the room

To prepare for a repair, clear the area directly under the damaged section. Move furniture to another room or cover it with plastic sheets to protect it from plaster dust. This allows for easier movement of ladders and tools.

Removing curtains or blinds from nearby windows helps prevent them from getting dusty. Ensuring the room is well-ventilated helps the jointing compound dry more efficiently between visits.

Information for a quote

When requesting a quote, send photos that show both a close-up of the damage and a wide shot of the whole room. This helps us see the ceiling height and how the repair fits into the overall space.

Include measurements of the damaged area and details about what caused the leak. Knowing if the source was a burst pipe or a roof leak helps us understand the likely extent of the moisture spread within the wall cavity.