Within the world of multifamily construction, manufacturers design and detail the multistory continuous threaded rod holdowns used as shearwall overturning restraints. The Strong-Rod® anchor tiedown system (ATS) is Simpson Strong-Tie’s solution for the industry and has been the subject of many SE Blog topics in the past.
Wood is a unique building material because its characteristics are dependent on the environment and its moisture properties, which can vary over time. Often, sawn lumber is delivered to the jobsite with relatively high moisture content. Over the life of the building, moisture content will decrease until equilibrium has been achieved. As moisture content drops, the wood members shrink. Most wood shrinkage occurs during the first six months of the building life and it’s an important design consideration.