(Not a completely "woodie" question, but it might be useful to others building sheds/workshops.) I've recently built a new store shed, with box profile steel roof (reclaimed, needless to say!). The shape of the profile means that there are gaps at the eaves, which need filling to prevent rodents etc. getting access. The only pre-made filler strips that seem to be available are in some sort of foam plastic, which is probably nice and chewy to mice etc. Is there a source of anything a bit more robust, or is it necessary to make up something? (for the time being, the gaps are filled by stuffing in spare fibreglass insulation - should at least give the little beasts pause in their chewing)