Problems With Cavity Trays And Weepholes Damp Beneath Floor To scale back the risk of damp and timber decay, a great flow of air underneath the ground floor is necessary, so quick brick sleeper walls had been in-built with a ‘honeycomb’ pattern; the gaps enable air to circulate. The http://jaidentiwfo.blogzet.com/clear-cut-practices-for-sub-floor-ventilation-fans-some-ideas-11483175