Berlin G180 1640 sq. ft. Glulam log home D.I.Y. building kit | Hud-1 EZ Buildings The Berlin G180 Glulam log Home D.I.Y. building kit comes with 7 in thick wall logs offers 1297 sq ft of interior space, 350 sq. ft. uncovered porch for a total of 1640 sq. ft. the walls have an energy R19 value this is the building kit offers an excellent energy value rating for anyone looking to build a home or a vacation home.