One thing people often do not think about is bees, the bad kind, gaining access to the attic area. I work with one realtor who looks for gaps from the outside to the attic while I am doing the rest of the inspection. I asked him why that is of such interest to him. The answer was that yellow jackets got into his house one time and before they were done they made a nest and came out through a hole they made in the sheet rock. They swarmed the occupants of the home, and stung several people. Lucky nobody had a bee allergy. I have inspected a number of houses where I saw dead yellow jackets in the attic. They often come through gaps at the soffit, typically the "bird-block" soffit that is screened. The top photo gives a good view of such gaps in a dark attic. Look for daylight. You can see how these gaps would allow a bee to enter. Obviously, caulking and filling those gaps, at the time of installation or later,  should be done. In the attic pictured below, muddauber wasps left their brood cells behind. Muddaubers eat other insects and are good to have compared to yellow jackets and various hornets.

Steven L. Smith

Bellingham WA Home Inspector