Bought a mid 1970's vintage house in the Seattle area last April. The house
has had ongoing problems with rats in the crawl space. If the assortment of
insulation between the joists is any indication, some has been replaced at
least twice, likely from this problem, and a bunch of it is torn/pulled
down/soiled now from the animals as well. It goes without saying that the
goal is to keep rodents out of the space, and I am working on that (just
found one primary point of entry that was missed by TWO exterminators that I
know of, and probably more). However I plan to have ALL the fiberglass
removed & replaced with new insulation. I am wondering if there is any type
of insulation, maybe a rigid foam board material, or something sprayed on,
which is resistant if not impervious to rodents getting into it, on top of
it, pulling it down & nesting in it. Any helpful insights into this
Rats can chew through wood and metal, so impervious would have to be
something special. With a long-term infestation, I wonder what the
surrounding properties are like - open trash containers, pet food or
other food available? Rural? City? If you have neighbors nearby, do
they also have rat problems?
Thanks for the replies. The house is in a suburban area, but heavily
wooded. I don't think it's an issue of garbage or dog food. The footprint
of the crawlspace is probably 1300 sq'. If you're as small and clever as a
rat, and basically have nothing else to do when not looking for food &
screwing, the odds of you finding a gap for entry are pretty favorable. I'm
thinking given the history, and the complexity of finding & irreversibly
sealing off every conceivable entry point, if there were an insulation
alternative that wasn't quite as accomodating as fiberglass batts, it might
be a good choice.
Although the idea might be impractical due to expense, I would take some
pictures and show them to a couple of sheet metal fabricators. Perforated
aluminum over the insulation or some such thing.....vague idea. There has to
be something rats can't chew through.
I don't know of any insulation that would be impervious to rats or
mice. Maybe it would be better to just go with no insulation for now,
until you are sure the rodent problem is licked. Meanwhile you can
see how much it affects your heat bill, cold floors, etc. and then
decide whether to try insulating again. -- H
cover affected area with screen like hardware cloth or chicken wire.
insulate floor well say blown in foam then ventilate the lower part
rats like warm spot so they will move to your neighbors crawl space:)
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