by rigga »
Thu Feb 19, 2009 11:10 pm
It sound like these are weep holes above the cavity tray they are there to let any water out which lands above the lintels from the cavity usually from the roof . In my opinion you should leave them open, it should not make any difference to the ceiling if the loft is well insulated, as air movement within the cavity dries out any moisture that enters. The insulation that should be tucked into the eves should stop any air from travelling into the loft space.