1
: a supporting sill (as of a building or bridge) resting directly on a base and especially the earth
2
: a person of the lowest social level
Examples of mudsill in a Sentence
Recent Examples on the Web
To stop cold air from blowing into the basement or crawlspace, fill any gaps under the mudsill with expanding foam sealant.
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Joseph Truini, Popular Mechanics, 17 Feb. 2021
The floor frame of a shed includes the mudsill, floor joists and perimeter band joists.
—Joseph Truini, Popular Mechanics, 18 Mar. 2021
Then, cut pieces of fiberglass insulation or rigid polystryrene foam to fit tightly between the floor joists and up against the rim joist, which is the wide board that sits on-edge on top of the mudsill.
—Joseph Truini, Popular Mechanics, 17 Feb. 2021
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Joseph Truini, Popular Mechanics, 17 Feb. 2021
The floor frame of a shed includes the mudsill, floor joists and perimeter band joists.
—Joseph Truini, Popular Mechanics, 18 Mar. 2021
Then, cut pieces of fiberglass insulation or rigid polystryrene foam to fit tightly between the floor joists and up against the rim joist, which is the wide board that sits on-edge on top of the mudsill.
—Joseph Truini, Popular Mechanics, 17 Feb. 2021
Cite this Entry
“Mudsill.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mudsill. Accessed 23 Jul. 2025.
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