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Help identify what is chewing the knots in my TG ceiling


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Posted by B Fenton on 13:24:27 8/12/2016 from 73.74.82.93:

Help! I have been trying for several years to figure out what is chewing the knots in one area of my bedroom ceiling. Background: This room (second floor) was an addition to my home and constructed in 1996. So 20 years old. The ceiling height in the room is about 12 feet and it is an exposed cedar T&G ceiling with douglas fir exposed cross beams. On the exterior of the house there is a 3 foot roof overhang with the same materials. (Roof is flat and has a commercial Durolast roof membrane which is about 10-12 years old.) We are having several problems on the outside overhang with decaying T&G material which is going to be replaced shortly. We feel there might have been moisture on the roof when we had it replaced 10 years ago and possibly that caused progressive wood decay(?).
There is a situation in my bedroom above my side of the bed which is very curious and makes me feel we might have a insect problem which I would assume needs to be addressed when we open up the roof for repair. The knots in the T&G in one corner of the room appear to be freshly chewed.I have noticed this for at least 5 years and there are more "chewed" knots now than when I first noticed the issue. The ceiling has a stain finish so the chewed area is a different color. It is a flesh color, the natural color of the wood. No one seems to be able to identify what is happening including our home exterminator, a cedar T&G rep or the numerous carpenters we have had out to access the repair work.
On the inside we can see no active bug infestation. No dead bugs, no live bugs. No water damage or water seepage nor are there any flying insects nor dead bugs or sawdust etc on the floor. (*3 years ago on the opposite side of the room I did find evidence of carpenter ants and exterminator appears to have killed them as there is no new evidence of carpenter ants. There are some small spider webs on the douglas fir cross beams and some between the T&G boards. On the outside damage there is no evidence of live insects nor of active water problem. Nonetheless the wood is rotted. Rot area is spreading(on the exterior) Thank you for any help you can provide and how I can move forward to eradicate this situation.



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