Identifying this type of structural pest from damage

Hello,

I came across some structural damage and it’s unlike anything I’ve ever seen. There are potentially signs of mud-tubes in the crawl space, but the damage to the wood is something that looks to be a cross between termite and carpenter ants, with smooth tunnels. Any ideas from someone who’s pretty experienced with stuff would be appreciated.

Also, of course the buyers know and will have a pest control company come in, but it’s more for posterity.

Thanks

Mike

Michael, was there frass below this pic?:

And, is this frass below? (Saw dust looking stuff?)

If so, the damage is probably caused by carpenter ants.

I think the house had alien life in it. Where is @mgoldenberg

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OK fine!

Looks like subs. Most of Washington Sate is in TIP Zone 3 meaning slight to moderate activity. I don’t see any fecal pellets so I ruled out Dampwood Termites.
The configuration of the damage - what type of wood is that?
My guess is Douglas Fir. It is a softwood they like, however has some characteristics of hardwoods. The subs will be intentionally lazy & follow the soft areas, which may have much to do with what you’re seeing.
I first though Formosan Termites but there has never been a recorded instance of them out there.
ps>> My termite company was the first one to discover Formosan Termites in Hallandale Beach where they were destroying a 3 story condo bldg. Had to take samples for Univ of FL.

Thanks Marc, I think it is best to just say WDO and leave it to the expert. Sometimes even the experts have a tough time figuring it out.

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Termite damage.

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Thanks everyone for the input. It turns out to be the work of moisture ants, which are wood destroying organisms, but are not structural pests. They only affect damp/deteriorating wood. In all my five years of inspecting, I’ve never come across this, and since they’re not structural pests, I didn’t see them during the SPI training either. Below is a link to more info on them. https://www.buellinspections.com/moisture-ants-unlike-carpenter-ants-they-actually-build-things/

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