Sealants used in construction joints are expected to perform over long periods under changing environmental conditions. In practice, common issues such as cracking, loss of adhesion, or surface degradation are often related to improper material selection or mismatch with application conditions.

One of the most important factors in construction joints is movement capability. Joints in buildings are subject to expansion and contraction due to temperature changes, as well as structural movement over time. If the sealant cannot accommodate this movement, stress will concentrate within the material, eventually leading to cracking or detachment from the substrate.

Another common issue is adhesion inconsistency. Construction joints often involve different substrates, such as concrete, aluminum, or coated surfaces. Each material has different surface characteristics, which can affect bonding performance. Without proper material compatibility or surface preparation, adhesion may vary across the joint, reducing overall sealing reliability.

Weather exposure is also a key consideration. Sealants used in exterior joints must withstand sunlight, moisture, and temperature fluctuations. Over time, environmental factors can lead to hardening, surface degradation, or reduced elasticity. Materials that maintain flexibility under these conditions are generally more suitable for long-term performance.

In addition, application conditions can influence the final result. Joint design, application thickness, and curing environment all affect how the sealant performs after installation. Inconsistent application can result in uneven stress distribution, increasing the risk of early failure.

SMP/STP-based materials are commonly used in construction joints because they provide a balance between flexibility and adhesion across different substrates. Their curing mechanism also allows application under typical site conditions without the need for specialized equipment.

Based on RISUN’s experience, selecting sealants for construction joints should start from joint type, substrate combination, and environmental exposure. In addition to material supply, RISUN can support customers by reviewing application conditions and providing basic recommendations for joint design, surface preparation, and material matching, helping to improve performance consistency in real construction scenarios.