no, but you need a safety backing, a gooey metal film which means that if it breaks it stays as one piece. Soon, though, they go poxy and brown lurgified round the edges. Has this happened to the old ones?
you just say "with safety backing, please" to the peeps who make the mirrors.
Otherwise you could just put loads of er fablon on the back which is about the same thing- i wd be careful sticking it on just once, no repositioning, cos if you lift it the silvering mite come off. You also need t ask for it bevellled aroudn the edges to look nice, and "ground edges" so they aren´t left sharp. Isn´t this all very pbo-ish? actually, probly no - pbo types would never like to look attem selves in the mirror...
Hi Pauline pop along to 22-07 at Brighton I have installed several mirrors on giselle and have used the polycarbon? version it works well particularily where they can be fallen against in walkways. looks good and stays cleanish also can be purchased in eight by four sheets if required. I got mine from Dorking plastics but the Brighton shop does sell it but its more expensive.