On Mon, 25 Apr 2005 00:06:10 +0100, Alan wrote:

In message . com,
wrote

I've already done a quick test and I am quite positive that the
polycarbonate sheet will work just fine if not better than chipboard.

Will it still be as strong in, say, 5 years time? Will UV or heat cause
it to become brittle? Will it suffer fatigue with constant walking
across it?

The window glass will filter out most of the shortwave UV, so it should last a lot longer than if
used outdoors.