If you’ve noticed damp patches on internal walls — especially at low or mid-level height — it might not be rising damp at all. In many North Wales homes, failed or saturated cavity wall insulation (CWI) is the hidden cause of penetrating damp.
At Weather Wise Solutions, we regularly inspect properties across Mold where dampness has spread through the wall cavity because insulation has become wet or bridged.
💧 How Cavity Wall Insulation Causes Damp
Cavity wall insulation is designed to improve thermal performance by filling the air gap between your home’s inner and outer walls. However, when insulation becomes saturated, incomplete, or bridged, it can trap moisture instead of keeping it out.
Common causes include:
-
Blocked or missing cavity trays
-
Debris in the cavity allowing moisture transfer
-
Water penetration through cracked render or pointing
-
Poorly installed insulation that touches the internal wall
-
Flooding or driving rain soaking insulation fibres
Once moisture breaches the inner wall, it can cause persistent damp patches, peeling paint, and salty deposits, often mistaken for rising damp.
🧰 Diagnosing and Repairing CWI-Related Damp
The first step is a cavity inspection using a borescope or thermal imaging to confirm whether the insulation has failed.
If it has, we can organise CWI removal, cavity cleaning, and appropriate damp proofing or wall treatment to restore the wall’s integrity.
At Weather Wise Solutions Limited, our specialists provide a full moisture assessment, identifying whether your damp issue is due to failed insulation, penetrating damp, or another source entirely.
We only use proven systems from PAM Ties, Wycamol and other trusted suppliers, ensuring all remedial work is carried out to professional standards.
🏡 Why Choose Weather Wise Solutions
We’re proud members of the Federation of Damp the Damp Proofing Association and Trust A Trader
Our CPD-qualified team delivers accurate diagnosis and long-term solutions, with insurance-backed guarantees on approved damp proofing works.
👉 Book your free insulation and damp assessment today:
https://weatherwiseuk.co.uk/pages/contact