Post and Beam

Post and Beam, wood working product in E4E form with reeded / groove must follow the rules below :  (1) feature wide is not more than  4.500 mm2 and has reeded / groove at the 2 sides, with the deep at each side at least 2mm; (2) feature wide is not more than 8.100 mm2 and has reeded / groove at the 4 sides, with the deep at  each side at least 2mm; (3) feature wide is more than 8.100 mm2 up to 14.400 mm2 and has reeded / groove at  the 4 sides, with the deep at  each side at least 4 mm.