The article discusses how Positive Input Ventilation (PIV) systems, designed to reduce dampness by expelling stale air, can inadvertently cause moisture problems if not installed correctly. Key issues arise when stale air cannot exit properly, leading to condensation on cold surfaces, or when moisture escapes through wall cracks. Experts emphasize that while PIV systems should alleviate damp, installation flaws or obstructions can trap moisture, creating conditions for mould growth. Understanding these pitfalls is essential for effective home ventilation and moisture management.
As long as a PIV unit is correctly installed, it should reduce damp rather than cause it.
PIV systems work by gently filtering fresh air down through the house from the loft.
If there's nowhere for [stale air] to go, the stale air and any moisture it holds can end up trapped.
The moisture can become trapped inside the fabric of the walls, promoting mould growth and other damp issues.
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