Abstract: A timber framed building of components able to be fabricated forming a post and beam structure on a foundation completed with diaphragm sheathing on the outside of the frame, the building including exterior wall posts, rafters and ridge beams of paired timber plates which are connected by metal splicing members. The diaphragm sheathing is provided with a strong back between wall posts which runs substantially horizontally around the exterior walls and is secured to posts and is fixed along its length to the diaphragm sheathing. The system allows for aesthetic, low cost, demountable buildings, to be erected speedily by unskilled labor.