Our GIB® Helpline team receives a number of queries relating to the assessment and repair of plasterboard that has been exposed to water. Water damage can occur for a variety of reasons - such as leaks, burst pipes, internal overflows or prolonged condensation - and it’s important to understand when plasterboard can be dried and retained, and when replacement is required. 

In a small number of situations, plasterboard that has been briefly exposed to clean water may be left to dry and can regain its original integrity. However, when water exposure is significant, prolonged, or potentially contaminated, replacement is usually the safest and most reliable option. 

Can I replace only part of a bracing element, or does the whole sheet need to be replaced? 

Yes - partial replacement is possible in some situations. The minimum permitted size for a replacement section within a bracing element is 300 mm, which allows for part‑sheet repairs. Our recommendation is to cut from stud to stud. If the top cut does not land on a nog, it should be back‑blocked to restore strength and continuity. 

How far above the water‑affected area should I cut? 

We recommend removing plasterboard at least 300 mm above the highest point of water contact. Water can wick upwards through the plaster core or face paper, so cutting above the visible water mark ensures all moisture‑affected material is removed. 

How long does it take for plasterboard to dry out? 

Drying time depends on the board thickness, number of layers, board density, and the airflow and moisture level in the space. Even if the plasterboard surface appears dry, always ensure wet insulation has been removed so the timber frame behind can properly dry. A single layer of 10 mm GIB® plasterboard can dry within a few days in good conditions, but dehumidifiers and active ventilation will significantly speed up the process. If the water was not clean, or if you have any uncertainty about contamination, plasterboard should be replaced rather than dried. 

Can water‑damaged plasterboard be recycled? 

Plasterboard that has been exposed to contaminated water cannot be recycled, as it may contain materials that are unsafe to process. We also strongly advise not using self‑recycled plasterboard in gardens or landscaping, as contaminants may be harmful to soil and plants. Clean, dry off‑cuts can still be recycled through standard GIB® plasterboard recycling channels.

Need more help? 

For detailed guidance on assessing and repairing water‑affected plasterboard linings, you can access our comprehensive resources here. You can also contact the GIB® Helpline team: Monday to Thursday: 7.30am – 5.00pm, Friday: 7.30am – 4.30pm. Freephone: 0800 100 442.