Damaged gypsum plasterboard due to moisture
What it looks like
Leaving damp or mouldy plasterboard in place results in an unacceptable finish, potential health hazards, and can compromise the board's structural and fire performance.
Why it happens
Gypsum plasterboard is highly susceptible to damage from wetting, which can lead to delamination of the facing paper or mould growth. Any factory-installed plasterboard exhibiting such signs due to moisture during storage, transport, or installation must be removed and replaced according to the manufacturer's recommendations.
What it costs if it is missed
Gypsum plasterboard is highly susceptible to damage from wetting, which can lead to delamination of the facing paper or mould growth. Any factory-installed plasterboard exhibiting such signs due to moisture during storage, transport, or installation must be removed and replaced according to the manufacturer's recommendations.
How to inspect for it
Inspect all gypsum plasterboard for signs of water damage, mould, or paper delamination, ensuring any affected boards are removed and replaced.
How to prevent it
Gypsum plasterboard is highly susceptible to damage from wetting, which can lead to delamination of the facing paper or mould growth. Any factory-installed plasterboard exhibiting such signs due to moisture during storage, transport, or installation must be removed and replaced according to the manufacturer's recommendations.
Basis in regulation
BS EN 520
Read the source
Last updated 23 August 2026. This is our editorial summary of publicly available regulation and site practice, not building control approval or a warranty determination.