INTERLOCK™ JOINERY SYSTEM Our patented Interlock™ Joinery System is an engineered system in which the major components act in union, allowing the natural, subtle settling process inherent in all log home construction. To create a more weatherproof and draft-free home, this system includes our single baffle-and-channel log design with its large 2-inch-wide tongue; PVC Lockspline™ connecting strips and foam gaskets along the log tongues and at all butt joints, corners, windows, and doors; and Olympic OlyLog® fasteners along each course of logs. For more detailed information about our Interlock™ Joinery System, visit the Why Choose REAL™ section of this site.