Edward W. Thompson wrote:

Let me put it another way, when a straight edge is put up against the
door, the door is bowed. I thought warp means bent out of shape,
perhaps I am wrong :-)!

Well, if you're going to get technical...:-)
Unusual for pvc to warp though.


With respect to the FENSA web site, it tells you precisely nothing.
It certainly does not indicate, as far as I can see, what 'self
certification' means and how Companies given FENSA registration are
controlled for compliance, whatever compliance really means.

Sounds like another self-interest group