We typically use a helical pile (helical screw) to anchor the house and account for wave action and scour. Typically piers are on a 10’ to 14’ grid. In most cases, we use a 16”x16” concrete pier with a Replaceable Bonnet Gate Valve or stainless steel valves and steel rebar reinforcement connected to a 2’ x 3’ grade beam on a grid or waffle pattern. If the site is within a V zone, or Coastal “A” zone, then a pier foundation with breakaway walls is required. This ensures that the hydrostatic pressures can be equalized (inside and outside of the structure) which will prevent buckling or collapse. If the site is within an A or AE flood zone, a “traditional” foundation can be used – for example, a 12”x24” footing with a 12” foundation wall. The main requirement is that flood vents (typically smart vents) are installed in the direction of flow at no higher than 1’ above the grade or slab. If the site is within an “X” zone (formerly zone “C”) and well above any adjacent flood elevations, then no special flood considerations are required. How that’s done deserves its own blog post. At least one clip is required at each floor line at each vertical steel element of the area separation wall.Today you’ll learn what a V Zone is! Using soils, geotechnical data and site information (as well as site data, the flood zone, grades, architectural design, etc.), we are able to design an appropriate foundation for any home or structure.Wall heights are dictated by the specific fire-rated assembly.Attachment to the adjacent framing is with one 1-1/4” Type W or Type S screw.Clips attaching H-studs and vertical C-runners to adjacent framing on only one side and with exterior exposure on the other side require attachment to the H-stud and C-runner with two 3/8” Type S screws.
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