TIP: sub-floor air flow is often insufficient
Sub-floor air flow is often insufficient. Consider increasing sub-floor ventilation, either with more airbricks or an inline extractor such as this; https://www.amazon.co.uk/gp/product/B07KRWXW8W/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1. With rigid