Innovative Strategies for Light-Frame Mid-Rise Buildings in High-Seismic Regions presents a detailed design example and practical guidance for engineers and builders responding to rising seismic demands on Canada’s West Coast. With the 2020 National Building Code of Canada significantly increasing seismic forces—particularly in Vancouver and Vancouver Island—conventional light-wood-frame (dimensional lumber) shearwall systems often no longer meet code requirements without costly additions.

This guide, prepared by WHM Structural Engineers for WoodWorks BC and the Canadian Wood Council, explores two high-capacity shearwall solutions: Mid+Std walls, a code-compliant adaptation of Midply construction that achieves roughly 50% greater capacity than standard walls without increasing wall length, and Double Nail walls, a research-based approach using double rows of edge nails to match Mid+Std strength. Combined with lightweight floor topping strategies, these systems enable six-storey light-frame buildings to remain viable and cost-competitive even on poor soils and in the highest seismic regions.

Cost analysis shows Mid+Std walls incur about a 30% framing cost increase over baseline, while Double Nail walls add about 20%, both more economical than doubling corridor wall lines. The publication includes complete design calculations, construction considerations, and conceptual connection details to help practitioners implement these strategies confidently.

This resource equips designers, contractors, and owners with practical, innovative approaches to maintain the competitiveness of light-frame wood construction while meeting the stringent seismic requirements of the latest building codes.