When Mould Is Behind the Surface

The visible patch is often the smallest part. What matters is whether the substrate behind it is wet.

What matters, and why.

Signs it is deeper

A patch that returns within weeks of treatment, paint bubbling or lifting, a musty smell with no visible growth, and a cool patch on a wall you can feel with your hand.

Why painting over fails

Paint is not a barrier to moisture. It hides the growth for a few weeks and gives you a worse problem later.

How it gets investigated

Thermal imaging and moisture metering locate the damp area without opening anything. Where it points to a cavity, a section has to come out.

Our boundary

We treat what is accessible and report what is not. Opening walls and repairing the source is building work, and we tell you that rather than papering over it.

If this is something you would rather hand over, our mould treatment and deep cleaning is scoped at an inspection and confirmed in writing before any work begins. We will also tell you when a job does not need us.

Questions

Answered plainly.

Thermal imaging and a moisture meter are non-destructive and usually enough to locate the area.

It traps moisture more readily, particularly vinyl-backed types on an external wall.

That is the clearest sign the source has not been found. Stop treating the surface and investigate properly.