# What actually causes PCB warpage? And can it be fixed?

**URL:** <https://sierraconnect.protoexpress.com/t/what-actually-causes-pcb-warpage-and-can-it-be-fixed/4423>\
**Category:** Factory Floor\
**Tags:** warpage\
**Created:** [August 27, 2026, 5:08pm UTC](https://sierraconnect.protoexpress.com/t/what-actually-causes-pcb-warpage-and-can-it-be-fixed/4423 "2026-08-27T17:08:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lucy.sierracircuits](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/lucy.sierracircuits/32/8_2.png) [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Post date:** [August 27, 2026, 5:08pm UTC](https://sierraconnect.protoexpress.com/t/what-actually-causes-pcb-warpage-and-can-it-be-fixed/4423/1 "2026-08-27T17:08:56Z")

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https://fast.wistia.net/embed/iframe/6nqvic2dq8

An unbalanced stack-up is not a great start but there’s more.

In this video, we’re on the manufacturing floor with Billy looking at how we check a PCB for warpage, what can cause a board to bow or twist, and what we can sometimes do to bring a warped board back within tolerance.

We cover everything from **uneven copper distribution and asymmetric dielectric thicknesses to prepreg selection, lamination cooling, routing, and single-sided constructions**.

One of the biggest takeaways: some warpage issues originate in fabrication, but others can be inherent to the PCB design or stack-up, which is why catching them **before manufacturing starts** matters.

**What’s the most common cause of warpage you’ve encountered?**