Blueprint: Continuous Load-Path Roof Tie-Down — Build Specification

Build specification for a continuous load-path strap-and-anchor roof tie-down assembly for a 9.0 m x 6.0 m low-cost house: galvanised straps over each rafter screwed to rafter and wall framing, continued by M12 rods grouted 350 mm into grout-filled masonry cells, zoned at 0.9 m in the field, 0.6 m at the edges and doubled at 0.6 m at the corners, 30 units at USD 264.00 per house. DESIGN BLUEPRINT - SIMULATED, NOT MEASURED - NOT BUILT, NOT LOAD-TESTED. All performance numbers are from the source paper: design capacity 3.67 kN per unit governed by grout-to-masonry bond in weak masonry, design limit wind speed 41.3 m/s set by the edge zone, falling to 29.5 m/s in very weak masonry at 250 mm embedment and rising to 57.0 m/s in medium masonry at 450 mm embedment.