Poly smiths/ national mix

[gwizzie]

I dont think it will matter if you use poly or wood if the mouse/rat wants in they will chew their way in, but I'll stick with my poly's and use the few wooden when I have to.

[nemphlar]

My cedar smiths have already been around a lot longer than I'm likely to be and still in good condition DR so I don't doubt your correct.
I don't want to speak to soon but I've not had any sign of vermin having a go at them and the nucs are made of 25mm low density poly. All of mine are on minimum 15" stools which may be deterring them, although even the woodpeckers don't seem to bother