None of the roof vents on my 1951 house have any kind of cover. I suspect that two (that used to serve no longer used floor furnaces) might be how rats are getting into my subfloor. Those I certainly want to cap. Unless there is a reason not to, I would also like to cap all the plumbing vents while I am up there. What do you recommend for caps that will still let the vents breathe? Thanks.

Dang. I have posted images in the past but apparently I am no longer capable of figuring that out. I hope you can offer advice without the pics.

Vent pipe #1 looks like asbestos pipe and would be used as a flue pipe. The other pipes appear to be plumbing vents.
If the flue pipe is no longer being used and not blocked off underfloor, that would be a easy way for rodents to enter the underfloor area. A rubber expansion plug should be able to seal that pipe. The other 2 pipes are no longer being used as plumbing vents? If this is correct, there are rubber caps or expanding plugs that can be used with them.

You can use galvanised wire mesh to cover vents while letting them breathe and blocking rodents from getting in. The mesh can be secured over the vent pipes with large hose clamps.



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Steve, the asbestos pipe is abandoned so your expanding plug idea is perfect. Thanks.

George, I already have wire mesh and hose clamps so that is a great idea. Thanks.



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