Wall thickness is hidden inside the frame but decides its rigidity. Here's why it matters.
Wall thickness is how thick the uPVC walls of the profile are. It determines rigidity, and because it's hidden in the finished window, cheap profile sometimes thins it to cut cost.
Since you can't easily see it, ask about the profile's wall thickness and whether it's a quality branded system. Thin-walled bargain profile is a false economy that shows up as flex and warp.
It determines the frame's rigidity — sound thickness resists warping; thin walls flex and warp over time.
Not easily once it's a finished window, which is why cheap profile sometimes thins it. Ask the maker and choose a branded system.
Usually — it shows up later as flex and warping, costing more than it saved.
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