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Old 01-28-2019, 09:07 AM
 
Location: Deep 13
1,031 posts, read 755,659 times
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There is a video about home building/remodeling where it was suggested that before you close off an area with sheet rock, that you sprinkle some boric acid in that area to thwart any passing insect that might happen to be in there.

How long do you think boric acid would be effective for in an enclosed cavity? Would diatomaceous earth be a better substitute or even a combination of the two?

Planning on doing a bathroom remodel and was thinking of placing something under the bath tub area as a form of insurance. Don't really have any bug issues any more than your average southern Mississippi home. Any roaches we have seen are mainly in the bathroom areas due to the moisture.
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Old 01-29-2019, 07:24 AM
 
Location: Somewhere in northern Alabama
17,229 posts, read 52,503,963 times
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How long do you think boric acid would be effective for in an enclosed cavity?

Indefinitely. It doesn't degrade.

Would diatomaceous earth be a better substitute or even a combination of the two?

Perhaps a combo. In that area there could be moisture caused caking that would mildly reduce effectiveness.
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Old 01-29-2019, 07:55 AM
 
Location: East of Seattle since 1992, originally from SF Bay Area
28,899 posts, read 52,233,588 times
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Yes, diatomaceous earth must remain dry to be effective. I use it in my greenhouse vegetable garden but it has a drip irrigation system so the water is controlled and doesn't contact it. I have had Japanese beetles and ants, both eliminated with it. Boric acid has a more limited use, it must be ingested by the pest, and it's not as safe for children and pets, though that doesn't matter inside a wall cavity.
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Old 01-29-2019, 10:24 PM
 
Location: Out there somewhere...
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Diatomaceous earth will be more effective over the long run than boric acid.
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Old 01-31-2019, 09:23 AM
 
Location: Minnesota
1,808 posts, read 695,774 times
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Diatomaceous earth is a mineral, formed from lava. It doesn't have any active ingedients. It works on killing insects because it has "sharp" edges and cuts the insect when particles of it get on insect. It doesn't dissolve or wear out nor is it toxic. Where as boric acid is toxic to insects and can degrade and dissolve.

A combo of both would probably be good.

I've actually seen some people promote the ingestion (yes eat it) of diatomaceous earth, not that I would do that.

I think diatomaceous earth has been used as insulation.
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Old Today, 07:03 PM
Status: "ready for spring" (set 3 hours ago)
 
Location: Western KY
42 posts, read 16,509 times
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We used both when we redid our floors last year, and redid a few walls. ( went from crappy paneling to drywall).

Just dusted all the studs and joists and insulation liberally, and so far, no problems with pests.
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