I just went through this, in our house and a few neighbors (2013 vintage) there was a screen with maybe 3/16 inch mesh. The wasps were able to get through this and into the house. I and my neighbors were able to remove the plastic covers, install regular screening and replace the cover. This took a few minutes for each cover. No wasps since the change.
__________________
Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
|