Do termites prefer certain wood to other. I ask this because I have a termite problem and I see where they came in behind my concrete front stairs but the damage is in random spots. Its like they made tubes over some boards for like 2 feet then ate a board 4 feet away. They ate one whole 10 foot section of sill plate but not the sill plate they had to walk over to get to the one they were eating. this random eating is making it very hard to find all the damage. Everytime I think I have it all I find another board 5 feet away thats been chewed up. Is this normal.?