New upvc porch - fittings and ideas
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.
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