Phase 1: Planning and Site Assessment
Successful storefront installation begins long before fabrication. A thorough site assessment establishes the foundation for the entire project. Visit the site early to identify existing conditions, structural alignment, and potential obstacles.
Key Assessment Tasks: Measure floor elevations and confirm they match architectural drawings. Check wall plumb and level—old buildings often have movement or settlement that creates slope or offset. Verify ceiling heights and soffit locations. Identify electrical outlets, mechanical rough-ins, and other building systems that may conflict with storefront installation. Document existing finishes and define the scope of demolition and new installation.
Structural Verification: Confirm the structural frame location and anchor point positions. For storefronts, anchors are typically installed by the general contractor or structural trade. Verify that anchor locations match the storefront engineering before fabrication begins. Misaligned anchors often cause field problems and delays.
Code and Compliance Review: Identify code requirements for wind speed, water infiltration testing, ADA compliance for doors and accessibility, and any impact-rating requirements (particularly important in Florida HVHZ areas). Ensure storefront specification matches code requirements before fabrication.
Phase 2: System Selection and Design
Selecting the right storefront system determines long-term performance and satisfaction. Consider performance requirements, aesthetic goals, and budget constraints.
Standard Aluminum Storefront: The most economical choice for general commercial applications. Suitable for moderate wind speeds and water exposure. Lead time typically 6-8 weeks. Cost-effective but requires skilled installation for water tightness.
High-Performance Storefront: Includes thermal breaks, improved weather seals, and pressure-equalized cavities. Better thermal and water performance than standard systems. Lead time 8-10 weeks. Appropriate for retail and office buildings where energy efficiency and durability matter.
Structural Glazing Storefront: Silicone-bonded glass creates seamless, architectural appearance. Requires sophisticated engineering and longer lead times (10-14 weeks). Used for premium retail and hospitality applications.
Cost Considerations: Material cost typically accounts for 40-50% of total project cost. Labor, anchors, glass, and finishing represent the other 50%. System selection affects both material cost and installation labor intensity.
Phase 3: Detailed Measurement and Fabrication
Precise field measurement is critical. Before fabrication, take detailed measurements of all opening dimensions, floor elevations, ceiling heights, and structural conditions. Document deviations from design drawings with photographs and dimensioned sketches.
Measurement Best Practices: Measure multiple points at each elevation—don't assume walls are plumb or floors are level. A wall might vary 1/2" over 12 feet. Measure from finished floor elevation to soffit or underside of structure at multiple points. Document any slope or irregularity. Photograph existing conditions and mark measurement locations clearly.
Submit Shop Drawings: Based on field measurements, the fabricator prepares detailed shop drawings showing frame members, glass sizes, hardware locations, and installation details. Review shop drawings carefully and confirm they match field conditions. Any discrepancy should be resolved before fabrication begins.
Lead Time and Ordering: Order materials with adequate lead time. Aluminum frame extrusions may require 8-10 weeks. Specialty glass (tinted, low-E, impact-rated) may require additional time. Coordinate with the general contractor to ensure storefront arrival aligns with the installation schedule.
Phase 4: Installation Sequence
Anchor Installation: Confirm anchors are set to correct elevation and location. Anchors are typically installed by the general contractor using adhesive or mechanical fasteners into concrete or structural steel. Verify anchor spacing and elevation before storefront frame installation.
Frame Installation: Starting at one end or corner, install vertical mullions first, securing them to anchors. Use shims to establish plumb and alignment. Working progressively across the opening, install horizontal members and continue vertical mullions upward. Verify plumb, level, and square at each stage.
Sealant Application: After frame installation is complete and verified, apply primary sealants to frame joints, anchor points, and exterior face of frame. Proper sealant depth and application are critical for water tightness. Use tooling and best practices appropriate to the sealant type.
Glass Installation: Once frame is sealed and cured, install glass panels using proper gasket materials. Ensure gaskets are continuous and properly seated. For structural glazing systems, apply silicone bonds per the system manufacturer's detailed procedures. Inadequate or improperly applied sealant is a common source of water leaks.
Hardware Installation: Install locks, closers, hinges, and other hardware. Adjust doors for proper operation and closure. Test all hardware function before final inspection.
Phase 5: Quality Control and Testing
Visual Inspection: After installation, conduct a detailed visual inspection. Check sealant continuity, verify no missing gaskets, confirm glass is properly seated. Look for debris, caulk drips, or adhesive residue. Clean the storefront and detail any cosmetic issues.
Water Infiltration Testing: Per ASTM E331 or code requirements, conduct water tightness testing. A spray test applies water to the exterior while the interior is monitored for leakage. Any water penetration during testing indicates seal failure and requires correction before acceptance.
Structural Testing: If required by code, conduct deflection and pressure testing. These tests verify the system performs at design wind speeds without excessive deflection or failure.
ADA Compliance Verification: For entry doors, verify proper hardware operation and accessibility. Door opening force should not exceed 5 lbf. Emergency hardware operation should be tested. Verify door width and approach clearance meet ADA standards.
Common Issues and Troubleshooting
Water Leaks at Frame-to-Anchor Interface: The joint between the frame and the anchor point is a common leak source. Solution: Ensure this joint is sealed with sealant applied to proper depth and width. Apply tape on top of sealant to protect during cure. Use expansion foam or backer material to control joint width.
Water Leaks at Vertical Mullion Joints: Interior-facing sealant joints in vertical mullions can fail if not properly applied. Solution: Apply sealant to proper depth, use appropriate backer material, and tool sealant correctly. Some systems require sealant on both sides of the joint.
Condensation on Interior Glass: Interior surface condensation typically indicates inadequate ventilation or thermal performance. Solution: Verify building HVAC is operating and providing adequate air exchange. Consider upgraded glazing with lower U-value for future installations. This is often a building condition issue, not a storefront failure.
Door Hardware Issues: Doors binding, closers leaking, or locks failing are common. Solution: Conduct proper adjustment during installation. Verify door width and frame opening match specifications. For closers, ensure proper tension is set and lubrication is adequate.
Uneven Glass Seating: Glass may not sit evenly in gaskets if gasket material is damaged or frame is out of square. Solution: Inspect gaskets for cuts, tears, or contamination before installing glass. Verify frame is square and level. Properly seated gaskets should grip glass evenly around the perimeter.
Best Practices for Installation Success
Communication: Maintain clear communication between the glazing contractor, general contractor, and designer. Weekly coordination calls prevent misalignment on scope, schedule, or specifications.
Documentation: Document field conditions with photographs and measurements. Create a photo record of installation progress. Maintain records of materials, sealant batch numbers, and testing results. This documentation is invaluable for troubleshooting and warranty claims.
Training: Ensure installation crews understand system details. Many installation problems stem from improper technique. Training on sealant application, gasket installation, and hardware adjustment prevents costly rework.
Weather Protection: Protect newly installed storefront during cure periods. Sealants require adequate temperature and humidity for proper cure. Cover storefront to prevent rain during cure. Protect glass from thermal shock by controlling interior conditions during cure.
Final Cleanup: Detail the storefront after cure is complete. Remove protective films, clean glass, polish hardware, and remove any construction debris. Quality detailing creates a professional appearance and leaves the building ready for occupancy.