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Question about those faint lines you sometimes see in insulated glass units | Glaziers - Librear

Question about those faint lines you sometimes see in insulated glass units

I was putting in some double-pane windows last week and spotted these really subtle lines inside the glass. I mean, they're not cracks or breaks, just like faint streaks that pop up from certain angles. Idk if it's from how they make the glass or maybe from storage. I've seen it before, but I never paid much mind until now. Maybe it's just me, but it seems to happen more with the bigger sheets. Has anyone else run into this? I'm wondering if it messes with the insulation or if it's only for looks. I tried searching online, but the info was all over the place.

3 comments

3 Comments

mia_fisher766mo ago

Back when my sister was remodeling her kitchen in 2020, she had these huge patio doors put in. After installation, we saw faint streaks just like you described, especially when the sun hit them in the afternoon. She called the company, and they sent a guy out who said it was from the tempering process and wouldn't affect anything. But honestly, it drove her nuts because she's picky about details, and she made them replace two panels anyway. Turns out the new ones had the SAME lines, so she just had to live with it. DEFINITELY seems more common with larger glass pieces.