Browse Proptionary encyclopedia

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Heavy and durable wood that is typically horizontal that supports the wall of a structure. Like most other support products and methods, sill forms the bottom portion of the frame.


A sill serves the purpose of attaching directly to a foundation or foundational wall of a house.

To ensure maximum safety in the case of an earthquake, anchor bolts attach to the sill and are put directly into the foundation of the house.

For example, a sill plate serves as a supportive structure in addition to a larger structure.

The sill plate will act as the primary frame piece at the top of a foundational wall.