Exterior Wall Sealing
Exterior wall sealing is a frontline defense against water intrusion on building facades, protecting brickwork, insulation, and interior finishes. Cracks, movement joints, and failed flashing can channel rainwater into masonry and cavity spaces if left unaddressed. Choosing appropriate sealants and coatings depends on substrate type, climate, expected movement, and the building's exposure to wind-driven rain.
Surface sealing often uses polyurethane or silicone-based products to fill gaps and create a flexible barrier against weather. However, surface seals may degrade under UV exposure or freeze-thaw cycles, exposing substrate and inviting moisture behind the coating. For longer-term durability on cracked or porous walls, injection waterproofing can provide a deeper fix that targets the source of leakage.
Before applying coating, surface preparation is essential, including cleaning, removing loose material, repairing voids, and ensuring a dry substrate. Assessing wall condition helps determine whether a simple recoating suffices or if structural repair or substrate stabilization is required. Exteriors should be checked for efflorescence, delamination, or hollow mortar, indicating hidden damage that could compromise sealing if not addressed.
Injection Grouting Method
Injection Waterproofing is a targeted approach to seal cracks and voids in exterior walls, stopping water infiltration at its common routes. The process typically begins with identifying crack paths, drilling entry points, and then injecting resin under controlled pressure to fill channels from the inside out. Resins used include polyurethane for flexibility and epoxy for rigidity, and the choice depends on crack width, substrate condition, and expected movement.
Waterproofing Materials
Exterior waterproofing materials include elastomeric coatings, cementitious systems, membranes, crystalline products, and compatible primers to improve adhesion. For balcony areas (베란다), silicone sealants around joints help block water from seeping behind finishes, preserving substrate stability. Finish surfaces such as plaster and stone (미장스톤) require compatibility checks to avoid cracking or delamination after repair, including testing for moisture compatibility and thermal expansion.
Maintenance and Checks
Maintenance and regular checks extend the life of exterior waterproofing after heavy rain, snow, and seasonal temperature swings. Look for new cracks, peeling coatings, damp patches, efflorescence, or unusual sounds from the wall, all of which can signal hidden leaks. Plan timely resealing, re-coating, or injection repairs and schedule professional assessments every five to ten years to maintain performance.