TP Graded®
Yellowstone Log Homes are TP® graded. Timber Products Inspection, Inc.(TP®) is the largest wood inspection agency in the nation. TP® is the only ALSC approved grading agency that has representation in all regions of the United States. TP® grading rules and design values are based on the nationally recognized standard ASTM D3957 (standard methods for establishing stress grades for structural members used in log buildings).
