I made a large gingerbread house using construction grade gingerbread, came out rock hard, seemed very dry. I just made it into a log cabin with pretzels rods, used royal icing made with meringue powder. It has dried however the logs are coming off in a full sheet?? detaching from the sheet of gingerbread as I tried to assemble the house? any suggestions to make these pretzel logs adhere to the Gingerbread walls, the walls seem damp from the icing??