Glass distributors face immense complexity in forecasting inventory—especially when managing custom units, hardware SKUs, and seasonal demand shifts. While many forecasting tools exist, the reality is that human habits and system limitations often trigger critical shortages or overstock conditions. These aren’t just operational problems—they are business risk accelerators.
Case Recap: Spacer Shortage in a Fast-Track Commercial Build
A distributor failed to forecast the spike in warm-edge spacer demand during a peak retrofit season. An ERP system defaulted to historical three-month rolling averages, which didn’t capture the surge in green building contracts. As a result, several high-priority IGU builds were delayed due to missing spacers.
The Business Impact
Three project delivery deadlines were missed.
Fabrication crews went idle, and emergency sourcing drove up costs.
Clients began diversifying their vendor list, citing risk concerns.
Key Lessons Learned
Forecasting models should reflect real-time project bookings, not just past usage.
Lead times must account for supply chain variability, especially for non-glass components.
Sales and supply chain teams must share project calendars to align planning.
Strategic Adjustments
Integrated demand planning system that includes RFQ pipeline visibility.
Safety stock levels adjusted for high-risk SKUs with longer lead times.
Monthly forecast review meetings including project managers and sales leads.
Inventory forecast failures rarely come from one bad decision—they come from a lack of shared visibility. Glass distributors that embed project-based planning into their systems gain speed, flexibility, and client confidence.
