Planning rooftop solar on a metal building whose purlins can't carry it? The TopHat Subframe strengthens the existing purlins from above, installed over the old roof, often avoiding strengthening work inside the building. At the Port of Cleveland in 2025, 3-1/2" 14 ga TopHat let a 200,000 sq ft warehouse carry its planned array and meet the design loads, saving time and money. Project-specific engineering available. Details: https://www.tophatframing.com/metal-roof-retrofit-for-solar.html