What is the key function of elastomeric sealants in building applications?

Elastomeric sealants are primarily designed to allow expansion and contraction in building materials. This elasticity is crucial because materials such as concrete, metal, and wood experience dimensional changes due to temperature fluctuations, moisture variations, and other environmental factors. When buildings expand or contract, the sealant accommodates these movements without breaking or losing its bond, thereby maintaining an effective seal and preventing water infiltration, air leakage, and structural damage.

While some sealants may contribute somewhat to aesthetics, their main role is not to enhance appearance, but rather to ensure structural integrity and functionality by adapting to movement. Resistance to heat and providing structural support are not primary purposes of elastomeric sealants; those functions are typically fulfilled by other materials and components in building construction.