I don`t exactly know but i think your question is, how can i damp a vertical ytong nest, right?
It isn`t very difficult!
Click at the Link below, the Website is German, but the Pictures shows more than Words could say (but you can use GoogleTranslate too).
Look at the last picture, a small slot at the top edge of the ytong will solve your Problem
i filled the slot with hydroballs, but i think it isn`t Necessary, maybe the wetness won`t be fly away so fast
http://ameisenwiki.de/index.php/Ytong-Nest:BauanleitungIt´s only the english i learned at school, so sorry for mistakes
