With the warmer weather there is more critter activity, and guess what, it is termites, DAMN IT!!!!!!! Not sure what I'm going to do about them at the moment, trying to come up with non-chemical methods to eradicate them. I have never seen them burrow through drywall before, eat the paper off the back, yes, but never burrow through.
I have not been under the house or deck yet to see if there are tubes to knock down, that will be a project for later this week. Wouldn't you know it, it's the corner of the house furthest away from the access hole too. How do critters always know where the access hole is to be able to find the most remote spot possible?
Did I say DAMN IT!!!!! yet?
This is bad news. Try orange oil termite treatment without toxic chemicals.
Termites hate dry sand. Pour a bag or two of course dry sand around each pier. When they go to make tubes, the tubes collapse and the termite union rep files a grievance. They go on strike and picket until the sand is removed.
Termites love to eat wood. Drywall used in ceilings contains paper and cellulose,papers made of wood. The brown spots that look like rust are probably from the mud tunnels the termites create. The tunnels may be breaking down from moisture then soaks into the sheetrock,
Looks like you have your hands full Spruceeeee...Good Luck
Round these parts dry termites are treated by tenting the house for a day, just like my next door neighbor. And my house. And the one on the other side......
If they are subterranean termites diatomaceous earth around the base of each pier will discourage them. Its like broken glass to us. You can use it as a layer under the sand, but you want a layer.
You can poke out the little holes and spray a boric acid roach dust into the holes, that drives them out also. There is a liquid foaming sodium borate solution that can be injected into your wall cavities to treat the wood against termites, but it takes a professional exterminator to do this, and it can't be done with some types of insulation. It can also be hard to find an exterminator who does this type of work, but as chemicals go, the sodium borates are pretty safe around humans.
BTW, I have an uncle who had this same problem with termites and he used the roach powder sprayed into the holes. He doesn't have termites now but I don't know if he ended up tenting the house or not. I think he did.
Also for subterranean termites, if you can jack the house off the piers even a fraction of an inch, then you can slip a copper plate between the top of the pier and the house frame. It needs to be at least two inches larger than the pier all around. That makes a termite barrier.
BTW, subterranean termites don't eat wood. They chew up wood, take it into the ground and make a paste of it, then plant a fungi in it and eat the fungi.