Curtain Wall Repairs
2 Storey Commercial Building
- The newly constructed building had systemic water penetration problems relating to the curtain wall assembly.
- A comprehensive investigation was performed including water testing (before and after repairs and at mock-up repair) and localized disassembly of system to check installation methods and materials.
- Improper fastener type and length resulted in a lack of compression at pressure plate. IGU thickness was less than specified, therefore specified glazing gaskets were too small.
- Incorrect sealant material and surface preparation at corner blocks resulted in poor adhesion and failure.
- Bottom of pressure plate drainage holes were higher than top of screw chase resulting in water to be stored behind pressure plate. Retrofit holes added.
- Deep screw chases were also back sloped and held water.
- No sill flashing to direct water to exterior.
- Internal seals between vertical and horizontal mullions were never provided. Hydraulic cylinder were used to separate the joints to facilitate sealant installation. All glazing and back pans within the curtain wall needed to be removed prior to completing this work.
- New sealant was provided at corner blocks after internal seal was reinstated. All interior glazing gaskets were replaced with larger size to help with compression.
- All pressure plate fasteners were replaced with appropriate size fasteners.