Caulking
（重定向自Cauking）
![Airman applying caulk to baseboard](/Images/godic/202501/03/Caulking,_USAF3713.jpg")
![Dried-out caulking on the Severn trow Spry, now displayed on shore](/Images/godic/202501/03/Caulked_hull_timbers,_Spry,_Blists_Hill3713.jpg")
![The tools of traditional wooden ship caulking: caulking mallet, caulker's seat, caulking irons, cotton and oakum](/Images/godic/202501/03/Caulking_tools3713.jpg")
![A caulking mallet, tar pot and a piece of petrified tar found on board the 16th century carrack Mary Rose](/Images/godic/202501/03/MaryRose-caulking_tools23713.JPG")
Caulking is both the processes and material (also called sealant) to seal joints or seams in various structures and some types of piping. The oldest form of caulking is used to make the seams in wooden boats or ships watertight, by driving fibrous materials into the wedge-shaped seams between boards. A related process was formerly employed to join sections of cast iron sewerage pipe.