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Caulk or (less frequently) caulking is a material used to seal 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 wooden boats or ships. Cast iron sewerage pipe were formerly caulked in a similar way. Riveted seams in ships and boilers were formerly sealed by hammering the metal.


Modern caulking compounds are flexible sealing compounds used to close up gaps in buildings and other structures against water, air, dust, insects, or as a component in firestopping. In the tunnelling industry, caulking is the sealing of joints in segmental precast concrete tunnels, commonly by using concrete.

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You will often here this term used when people are sealing a gap between two surfaces, like filling a gap, and possibly needing to be waterproof.
You may want to be sure that it is easy to paint it, how it will react to sunlight and the weather.



How to Apply Silicone or Caulk like a Pro