We have log house built in 1999, crew that put up the shell missed butyl sealant between a few of the logs (tongue and groove D-style, Kuhns Bros). When a driving rain (winds over 20 mph) from the east hits that side of the house, some water comes through. Outside has been chalked by a professional, but we still (maybe twice a year) get water through these seams. How should I repair this leak?