Sill plates are supported by the foundation of a building, typically made of concrete or masonry. They are directly attached to the foundation to provide a solid base for the wall framing.
Here's a breakdown of how sill plates are supported:
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Foundation: The primary support comes from the foundation wall or slab. The foundation provides a level and stable surface for the sill plate to rest on.
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Foundation Anchors (Anchor Bolts): Sill plates are secured to the foundation using anchor bolts (also known as foundation anchors) embedded in the concrete or masonry. These bolts are crucial for resisting uplift forces from wind or seismic activity. Building codes dictate the spacing and size of these anchors.
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Mortar Bed (Optional): In some cases, a bed of mortar is placed between the foundation and the sill plate. This helps to create a level surface, fill any minor gaps, and provide a more even distribution of load. However, it's not always necessary and depends on the evenness of the foundation.
In Summary: Sill plates are supported by the foundation and held securely in place with anchor bolts embedded in the foundation. A mortar bed may be used to ensure a level and even connection.
