Screwing into UPVC

[Chris]

What type of screws are the best for attaching door stays, bolts and whatnot to upvc doors and frames?

[Tim Watts]

Have you got any steel box section inside the frame (many do - usually the coloured frames and the better class of white). Try a magnet...

[sm_jamieson]

A self tapping screw is fine for the PVCu and the metal box section if there is any. Both materials with work fine with a small pilot hole, as long as the box section is not too thick. Don't us a twin thread screw - you want a fairly coarse thread. Simon.

[Tricky Dicky]

These are the types used by window frame makers

Richard