I am in the process of replacing a subfloor and have encountered a small problem with a larger number of pipe penetrations. Previously, it had been sealed with fiberglass around these, as it was possible to find some remnants of yellow debris among the mouse droppings, nests, dead birds, sunflower seeds, and everything else they had dragged in and left behind there. Because of this, I am not really inclined to continue using fiberglass. So, the question is, what can one use instead to achieve a seal, insulation, and as much as possible, make it mouse-free?
As the picture shows, there is a substantial number of pipes coming up. The only option I can think of is expanding foam, which would seal it, and mice are reportedly not very keen on chewing through it either, from what I have heard. But how good is it to apply foam directly against the sill plate and floor joists? Especially in a ventilated crawl space that is somewhat damp?
I would have sealed the penetration with gypsum plaster. Hygroscopic, cheap, easy to work with, something that mice won't go for, and fairly easy to modify if you need to add/change something. Or use foam sealant. Such a small area hardly causes any significant damage if moisture were to get in, I think.
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