We recently moved into a home with a small open fireplace in the bedroom. It is LP logs with 13"x13" terra cotta lined flue in masonry chimney. The sweep said he noticed some mortar missing between some tiles and some cracks in tiles. There was also no rain cap. I'm assuming this would be considered unsafe? I'm installing the rain cap either way just for weather protection. A little fire for an hour at bedtime would sure be nice when its cold... Have heat pump with electric backup.