12/20/2023 0 Comments Stem wall foundation plan for frame![]() ![]() The Earthquake Brace + Bolt (EBB) program offers grants of up to $3,000 to homeowners in certain higher-earthquake risk ZIP Codes for houses that qualify. Homeowners with properly retrofitted eligible houses can receive a premium discount of up to 25%. Learn about how (and why) Addison Homes builds a high performance stem wall slab foundationHealthyHighPerformanceHomes DwellWell0:00 Intro0:58 Stem Wall C. Strengthen Your HouseĬEA encourages owners of older (pre-1980) houses-in other words, houses that are more vulnerable to earthquakes-to retrofit their houses to strengthen them against earthquake damage. If your house does not have a raised continuous concrete foundation, or if it is not a wood-framed house, you should hire a licensed structural or civil engineer to advise on your retrofit efforts. New foundation anchorage can be installed by a licensed contractor according to a standard plan set for seismic retrofits, if your community has adopted such a plan set and your foundation meets plan-set requirements. Typically, Plan Set A (PDF) is used in Northern California, and Standard Plan Set 1 (PDF) is used in Southern California. For detailed information about foundation anchors, including which method to use, visit Earthquake Brace + Bolt. “Foundation anchorage” describes both foundation bolts and foundation plates, and either can be used to secure a house frame to its foundation. Foundation Anchors: Bolting Raised Concrete Perimeter Foundations A cripple-wall retrofit consists of anchor-bolting the base of the wood frame to the concrete foundation and bracing the cripple walls. “Cripple-wall” houses have a short perimeter wall between the foundation and the wood-framed first floor. Traditional foundations, often referred to as stem-wall, typically take 3 pours the footing, foundation walls and then slab. In my design, the concrete is 12 thick around the perimeter to support the load-bearing walls with a 4 thick slab in the middle. The stem-wall retrofit consists of bolting the house sill plate to the foundation using foundation plates. A monolithic slab is a concrete foundation that is completed in one pour. “Stem-wall” houses have a wood-framed first floor resting directly on a raised concrete perimeter foundation. Foundation-grade wood used in foundations is treated by steam-impregnating it with a chemical called CCA (chromated copper arsenate) at a concentration of at least. Two types of houses built before 1980-"stem-wall” and “cripple-wall”-may benefit from retrofitting with foundation anchoring, which reduces the possibility of a house sliding off of its foundation in an earthquake. Most people considering a wood foundation are concerned about rot and strength. ![]() Home > Prepare Your House > Structural Risks > Stem-Wall House Structural Risks of a Stem-Wall House ![]()
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