vapor barrier


: a layer of material (such as roofing paper or polyethylene film) used to retard or prevent the absorption of moisture into a construction (such as a wall or floor)

Example Sentences

Recent Examples on the Web Northrop also remarked that fuel stabilizers establish a vapor barrier. Matt Crisara, Popular Mechanics, 6 Mar. 2023 To build, the study said, the county would need to maintain a clean soil cap, install a vapor barrier under the jail and limit any exposure to groundwater. Courtney Astolfi, cleveland, 13 Sep. 2022 Plastic provides an excellent vapor barrier that helps prevent decomposition of joists and other support structures. oregonlive, 10 Jan. 2022 The downside comes when that promise turns out to be false — if the buyer moves in only to find out that the roof needs replacing or the bathroom has no vapor barrier and mold is growing. Washington Post, 21 Sep. 2021 Water-resistant upgrades include a new interlocking design, foam pads to control pressure behind the panels and a second layer of Henry Blueskin — a water and vapor barrier. Rochelle Olson, Star Tribune, 2 July 2021 In 2013, every brick (all 300,000 of them) was removed, a vapor barrier and more insulation were added and then new bricks (replicating the ones used in 1971) were installed. Rick Nelson, Star Tribune, 4 June 2021 The exterior walls are reparged and a vapor barrier added. Kevin Brasler, Star Tribune, 5 Sep. 2020 The exterior walls are reparged and a vapor barrier added. Kevin Brasler, Star Tribune, 5 Sep. 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vapor barrier.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

circa 1941, in the meaning defined above

Time Traveler
The first known use of vapor barrier was circa 1941

Dictionary Entries Near vapor barrier

Cite this Entry

“Vapor barrier.” Dictionary, Merriam-Webster, Accessed 22 Mar. 2023.

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

A Good Old-Fashioned Quiz

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?