In article ,
Harry Bloomfield wrote:
Chris Hogg presented the following explanation :
I might be wrong but I thought at least some UPVC structures had metal
cores within the main elements. It might be worth the OP just testing
the particular beam or upright he wants to screw into, using a cable
detector.

Certainly it will, but the depth below the upvc surface might prove to
be an issue for drilling a tapping.

You also need to be careful not to distort the frame. A prime reason for
doors and windows not closing properly. There can be quite a high load on
a washing line.

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*Reality? Is that where the pizza delivery guy comes from?

Dave Plowman London SW
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