Persistent condensation and mould problems in homes are often caused by poor ventilation. At Solvex Damp Proofing We install properly specified PIV systems that control humidity at its source and deliver long-term moisture management.
Condensation and mould are some of the most common issues we see in the north west. And in many cases, the root cause isn’t rising damp or penetrating damp — it’s poor ventilation.
That’s where PIV systems come in.
A PIV unit (Positive Input Ventilation system) is designed to gently introduce fresh, filtered air into your property, pushing out stale, moisture-laden air. The result is a drier, healthier internal environment and a big reduction in condensation and mould growth.
If your windows are streaming in winter, mould keeps returning on ceilings or behind furniture, or the air in your home feels heavy and damp — a properly specified PIV system could be the long-term solution.
A PIV unit (Positive Input Ventilation system) is typically installed in the loft space of a property and introduces a steady supply of filtered fresh air into the home. This creates a very slight positive pressure, gently forcing stale, moisture-laden air out through natural leakage points and existing ventilation pathways.
It doesn’t create draughts or make the property feel cold. It operates continuously and quietly, reducing humidity levels across the whole house rather than targeting just one room. The aim is simple, to lower internal moisture so condensation cannot form in the first place.
Most PIV units are installed within the loft space and vented through a discreet ceiling diffuser, usually positioned on the landing. The system is set according to property size and layout to ensure effective air circulation throughout the home. Some models include tempered air features to prevent the introduction of overly cold air during winter months.
Once installed, PIV systems are low maintenance, energy efficient and designed to run continuously. When correctly specified, they provide a long-term solution to chronic condensation problems.
With increased scrutiny around damp and mould in rental properties, landlords are under growing pressure to manage condensation effectively. A PIV system can form part of a wider moisture control strategy where internal humidity is the primary cause of mould growth.
However, ventilation should never be installed as a substitute for repairing structural defects. Landlords benefit most when a damp assessment is carried out first, ensuring the right solution is implemented and documented correctly
