Sill log. (Note regarding the lateral groove seen in this video: this type of groove is called a double cut or double scribe lateral groove and was invented by Lloyd Beckedorf, one of the most respected and well-known names in the industry. It is also used by many other highly respected builders and is listed as an acceptable practice by the International Log Builders Association. The fact that many of these commenters claim to be experienced builders yet are unaware of this is, quite frankly, c