A technical guide on selecting and applying weatherproofing silicone and EPDM gaskets to ensure facade joints are tightly sealed against atmospheric elements.
The Role of EPDM Gaskets in Internal System Sealing
EPDM rubber gaskets serve as the core component for mechanical sealing around glass units. These gaskets must be installed without excessive stretching on site, with corners secured via molded pieces or thermal vulcanization, ensuring the rubber doesn't shrink over time and create paths for air leakage.
Surface Preparation and Cleaning Joints Prior to Silicone Injection
Silicone fails to adhere to surfaces contaminated with dust or oils. Execution protocols mandate the two-cloth method using approved cleaning solvents (such as MEK or Isopropyl Alcohol), where the first solvent-dampened cloth dissolves contaminants, followed instantly by the second dry cloth to wipe away residue before the solvent evaporates.
Importance of Using Backer Rods to Control Joint Depth
To ensure joint silicone functions efficiently under expansion and contraction, it must be injected following a proper geometry that prevents three-sided adhesion. Polyethylene backer rods are inserted into the joint to control silicone depth, forming the ideal profile that allows flexible two-sided movement.
Chemical Compatibility and On-Site Material Adhesion Testing
Before approving any silicone type (structural or weatherproofing), compatibility tests are performed with project-specific aluminum, glass, and rubber samples. Additionally, field peel adhesion tests are conducted periodically during execution to verify the silicone's adhesion bond strength on actual site substrates.
