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Caulk
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{{Short description|Flexible material used in construction to seal joints}} {{For|the studs installed on horseshoes|Caulkin}} {{Use American English|date=December 2024}} {{Use mdy dates|date=December 2024}} {{More citations needed|date=September 2015}} [[File:Caulking underneath bathroom sink.jpg|thumb|upright|[[Silicone]]-based caulk on this upturned bathroom sink will spread smoothly, sealing the gap, when the sink is turned over and installed.]] '''Caulk''' (also known as '''caulking''' and '''calking''')<ref>{{cite dictionary |dictionary=[[Merriam-Webster]] |entry-url=https://www.merriam-webster.com/dictionary/caulk |entry=Caulk |access-date=December 11, 2024 }}</ref> is a material used to [[Seal (mechanical)|seal]] [[Joint (building)|joints]] or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on [[Boat building#Wood|wooden boats or ships]]. [[Cast iron]] [[Sanitary sewer|sewerage]] [[Water pipe|pipe]]s were formerly caulked in a similar way. Riveted seams in [[ship]]s and [[boiler]]s were formerly sealed by hammering the [[metal]].<ref>{{cite book |first=Walter S. |last=Hutton |title=Steam-Boiler Construction |date=1898 |url=https://books.google.com/books?id=IXtJAAAAYAAJ&pg=PA230 |page=230 }}</ref> Modern caulking compounds are flexible sealing compounds used to close up gaps in [[building]]s and other structures against [[water]], [[air]], [[dust]], [[insect]]s, or as a component in [[firestop]]ping. In the [[tunnel]]ing industry, caulking is the sealing of joints in segmental [[precast concrete]] tunnels, commonly by using [[concrete]].
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