What about those flexible plastic (i think) spike strips that people use to keep cats off fences?I have been looking in the rafters to see how I could screen it. For various structural issues it is not easy to do without impeding my ventilation baffles (closed at the moment, but open in the summer), or creating a loft that they will sit on and rain poop down on my head!
If you remember I screened the whole space and it still didn't stop Eli from getting up there.
Sigh.
Edit:
Apparently the ones i am thinking of are called bird spikes, the stainless steel ones are scary, but they come in plastic too.
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