They always begin at the edge of the glass.
Most standard "annealed" glass can only handle a temperature difference of about before it risks cracking. If you'd like to dive deeper, let me know: Are you dealing with a crack right now? thermal stress crack in window
Thermal stress cracks arise from real-world scenarios that create uneven heating or cooling: They always begin at the edge of the glass
Tinted or heat-absorbing glass is much more prone to this. 💡 Pro Tip a crack forms
If the stress of this expansion overcomes the structural integrity of the glass, a crack forms, often originating at the edge. Identifying a Thermal Stress Crack