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 Actually, we probably would rather live without moisture ants, but they are an important part of nature -- turning old wood back into soil. As a home inspector and a licensed structural pest inspector, I often see ants or, better yet, ants on the march. Fact of the matter is, the marching ants tend to be carpenter ants. Recently I ran into another ant infestation that is not nearly so common to find as the carpenters -- moisture ants. It is amazing how much damage these little insects can do. They come in different colors, a brown to a yellowish-green color, and they are tiny. Take a look at the photo below, but they are way smaller than that.

While these ants are small, boy what extensive damage they can do as they build galleries.  In this case, the toilet leaked, rotted out around the flange and floor and then came the moisture ants. That is one thing about this species, they are not particularly aggressive. That is, they will not move into healthy wood like some termites or carpenter ants. The moisture ants move into wood that is already very wet or rotting. So, really, don't blame them for all the damage. If things were in good shape in the first place, they would be nowhere around. For this same reason, they do not require a chemical treatment to eradicate them. Simply get rid of the water issue, be it plumbing leaks, failed caulking, etc and then replace the weak and damaged wood. In fact, bad as this spot was at the house, nobody had been living there in a long time -- no more flushing or toilet leaks -- so it looked like the ants had packed it up and had moved out. The amount of damage they can do, despite being an opportunistic and secondary infestation, is cataloged below.

  

The view from far away: fallen black insulation (mud from ants)

At first I suspected rats 

Rot, initial distinctive signs of moisture ant damage

  

Major signs of moisture ant damage, their distinctive work

 

Closeup of a piece I removed, a realtor asked me what it is.

The answer -- wood from the joist!

Thanks for coming by.

Steven L. Smith

Bellingham WA home inspector

 

33 Comments on Pacific Northwest Home Inspection (King of the House): Moisture Ant Infestation

Wow, no wonder I don't like ants. We have enough trouble with fire ants, termies, carpenter ants and about 50 other kinds - wasn't familiar with these but all ants seem to like moisture.

02/29/2008 02:07 PM by Steve Hoffacker - Real Estate Sales & Marketing Consulting and Strategies (Hoffacker Associates)


Yep,  the moisture tends to attract wood destroying organisms-- fungal and insect varieties.

02/29/2008 02:13 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Steven, thanks once again for great information.  I didn't think much of it, but I find small groups of no more than 30 tiny ants about once a week where there's no identifiable food source.  You may have identified what's going on.  The search begins.    

02/29/2008 02:56 PM by Kevin J. May Naples, FL Southwest Florida Real Estate (Prudential Florida Realty)


Kevin,

 

There are thousands of ants but only a few species that damage the wood, so what you are seeing might not be a problem. Are they up in the house or out in the yard?

 

02/29/2008 03:04 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Steve, they're in the house.  Oddly, I never see a trail of them that I can find the source of entry.  They are resistant to residual chemical.  They're maybe an eight of an inch long. 

02/29/2008 03:48 PM by Kevin J. May Naples, FL Southwest Florida Real Estate (Prudential Florida Realty)


Kevin,

Catch a few, send them up here, I can probably get an ant expert friend to identify them for certain. With WSU in our state, we have no shortage of entomologists.

02/29/2008 04:53 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Kevin, like Steve said, there are so many kinds of ant it can be.  But Steve, who usually has "ants in his pants" will be able to figure it out.  Good post Steve.  Here is a picture of another Moisture Ant nest---notice how similiar the structure is even though it is made out of different materials.moisture ant nest

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/29/2008 06:14 PM by Charles Buell, Seattle, WA, Home Inspector (Charles Buell Inspections.com)


You guys have me on a rampage now.  If I can't figure it out from here, how would you like 'em Steve, DEAD or ALIVE?

02/29/2008 08:17 PM by Kevin J. May Naples, FL Southwest Florida Real Estate (Prudential Florida Realty)


Kevin,

Just catch several, put them in a baggie alive and we will see how they arrive. Try to pack them so they do not get flattened. I do not necessarily know all the ants in your area, but I think I have contacts that could identify any ant. If you get these bug PHD's working you get results, they are curious, and they have quite a network I have tapped into before on tough stuff.

02/29/2008 08:24 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Charlie,

Regarding your photos, now that you have the joists out from under the sink, does your house still feel stable enough? Getting rid of that must kind of feel like killing your pets

02/29/2008 08:25 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Steve, this is what I mean, I think they read your comment, can't find a single one now.  I'll gather some and contact you when they're out and about on their next tour. 

03/01/2008 08:26 AM by Kevin J. May Naples, FL Southwest Florida Real Estate (Prudential Florida Realty)


Old wood is OK just don't gnaw on the wood for my house.

03/01/2008 01:14 PM by John Walters (Specialized Real Estate)


I never even heard of a moisture ant before- in our part of the country- we have termites- but I have never heard of the ants- thanks for the post and the education.

03/01/2008 01:24 PM by Debra Gambill Realtor, N.C. / S.C (Weichert Realtor's Southern Coast)


Still amazes me how destructive these little critters can be.  Good info.

03/01/2008 01:24 PM by Bill Gillhespy Fort Myers Beach Realtor (Century 21 Tripower Realty)


wow, interesting information. I had never heard of moisture ants before. Thanks for sharing.

Sean Allen

03/01/2008 01:28 PM by International Financing Solutions


I have a question about carpenter ants...I think you said they march? I sometimes find a semi-large "juicy" black ant wandering through my living room, by himself and I have called my regular exterminator who knows my house and he says that it is nothing to worry about---I don't have moisture problems but the house is a 1930's craftsman style bungalow and it did have Terms when I bought it but it has been treated and repaired. I hear that sometimes carpenter ants move into a former termite home; is that correct? It is a fairly rare appearance but I get really worried when I see one.

03/01/2008 01:32 PM by Paula Hathaway, LBA, The Hamptons, E. L. I. NY (Prudential Douglas Elliman RE, Hathaway Homes Staging, LLC)


I think EO Wilson (that academic guy who studies ants) says that the total biomass of ants in the world exceeds the total biomass of humans.  That's a pretty amazing statement.

03/01/2008 02:03 PM by John Hokkanen → Encinitas Real Estate (SurfTheTurf.com)


I am constantly surprised when I find that a homeowner has not had a termite inspection for 5-10 years or more. 

Then there are the owners who have the "Termite Warranty" and therefore ignore everything. 

NewsFlash.  Termites can't read!!!

I recommend to my buyers that they have a termite inspection every year.  Geez.  It costs a whopping $50.

03/01/2008 04:36 PM by Lenn Harley, Homefinders.com, MD & VA Real Estate


GROSS!!!  Those pictures are grossing me out for sure.  I've never heard of that kind of ant, but we do have carpenter ants up here.  I've had them myself, but now have my house treated twice a year and no problems since.  Gross!

Ann

03/01/2008 07:10 PM by Portsmouth NH Real Estate ~ Ann Cummings (RE/MAX Coast to Coast - Portsmouth New Hampshire)


Hi all,

Thanks for the comments. I am busy doing a report but will respond personally as I get a chance here.

03/01/2008 07:17 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


I have never even heard of moisture ants!  I guess (hope) I may not be alone in this...;)

Ha ha ha...Lenn..."Termites can't read..."  But they can make a killer pot of coffee...;) 

03/01/2008 08:33 PM by Joe Hayden - Louisville, KY Homes for Sale (S.G. Priest Realtors)


Steven - very interesting.  I guess we get our share of "critters" here in the Puget Sound that is much different than the east coast. 

03/01/2008 09:50 PM by HOPE Lending LLC


Steven - Congrats on the feature.  You so deserve it!  I've learned so much from you.  Thanks.

03/01/2008 09:53 PM by Laguna Homes|Laguna Condos| Laguna Real Estate|Marlene Bridges (Sherman Smith & Associates)


Thanks again for all the comments. When I get done with the bear of a report I am banging out, I will give you the attention you deserve, as far as your questions.

03/01/2008 10:50 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Good information on ants and pictures of damage. Thanks for the post Steven.

03/01/2008 11:27 PM by Tigard Oregon Real Estate >> Wayne B. Pruner, GRI (Oregon First)


Pretty disgusting...we see carpenter ants here a lot...it's common..I believe we see them in attics more and from water leakage from the roof areas. They are pretty big here an homeowners have seen them in inspections and don't even realize hey were there..it seems like they can be killed pretty easy but they definitely look pretty bad. We have all ant problems here in Florida as you probably know moisture is a big thing here.

03/02/2008 08:13 AM by Neal Bloom-Realtor ® Assoc.-CRS-Weston FL (RE/MAX Premier Associates)


Kevin

I don't know about the west coast where you are, but in the Fort Lauderdale area, we have a company called, Do It Your Self Pest Proof. If you do, or similar, put a few of the ants in a jar and bring it to them, they'll sell you the right stuff and tell you how to use the Chemicals the right way.

03/02/2008 12:59 PM by Michael Zollo-Certified Residential Appraiser, South Florida (A-Z Appraisals, Inc.)


Congratulations on the featured blog.  You deserve it!  You write good blogs and so does your friend!

03/02/2008 08:27 PM by Barbara S. Duncan ABR, CRS, GRI, e-PRO Searcy AR (RE/MAX Advantage)


Wow, there are way too many different kinds of ants. I have never heard of moisture ants before. That is crazy. I will definitely be on the watch out for leaks!

03/02/2008 08:42 PM by Christy Powers - Pooler, Savannah Real Estate Agent (Keller Williams Coastal Area Partners)


Paula,

It is probable that a large black ant is a carpenter ant. I would not say carpenter ants specifically look for termite houses but carpenter ants are an enemy of termites, they eat them. Also, the same conducive conditions that attract termites tend to attract carpenter ants. In fact, conducive conditions that attract one wood destroying organism tend to appeal to all varieties -- fungal and insect.

Do you have a problem? Well, that can be hard to tell. Do you live in the woods, with lots of trees around. If so, carpenters are often out looking to form satellite nests. Those of us in real estate ought to understand that -- they are looking for affordable housing that is not too crowded.

I do not like to find ants inside the home. Too often they came up from the crawl space or the attic. Now, if you take this ant and ring his neck, how long before you get another? If it is fairly soon, or even in a day or so, I would be concerned. On the other hand, if it is weeks or months, not so much so. When I said marching, I did not mean a single ant. I meant a few, or many, following one another and sometimes transporting their white pupa. If you are sitting on a deck or something, and see large black ants, then just watch them. If they are darting under your house, climbing up in soffit vents, going under the gable in a hole, then you have a real concern. This is hard to trouble shoot from afar.  Like I told Kevin, you can send me an ant, and I can ID it for you. But then one carpenter does not make a work crew.

 

03/02/2008 09:01 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


Steven - Thank you for this good information. We recently had a leak in our pump house, I didn't tend to it right away and found  the wood ants did quite a bit of damage in a hurry. Now I have to get busy and do some repair work.

Thanks for the good pics and information.

03/02/2008 09:33 PM by Carl & Ceil Winters (Complete Inspection Service, New Braunfels, Texas 78133)


Carl,

Glad it was helpful. We probably see more of this being in the wet northwest, than lots of the rest of you see.

03/02/2008 09:55 PM by Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)


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Inspector: Steven L. Smith, Bellingham, Wa. Home Inspector (King of the House Home Inspection)
Steven L. Smith, Bellingham, Wa. Home Inspector
Bellingham, WA
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King of the House Home Inspection

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Home inspection information designed to be educate the real estate buyer and the real estate professional. Blog posts include general information and information specific to the Pacific Northwest region.


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