The problems usually come when the droppings are in contact with soil and moisture so that the fungi can grow and multiply.

Also, have inspector take lots of wood-moisture-content readings. 

It started a couple of weeks ago and is gently being put back together. 5601 Staack, 78240 is the address. 630pm to 8pm.

There was about 3 cups worth of water total but I was concerned that the moisture would cause mold so I drill several holes in the ceiling to let air get into the cavities.

Is there moisture coming from the cracks, Is the house level, What year was the house built, Location is a big factor.

Most recently (summer of 2015) I was putting in shower high hats (recessed lighting), but only was required to use a "shower trim" It seals the high hat off from the moisture of the shower.

This is a bit of a newby question so please be gentle. :)If I purchase an investment property with cash.

Will cost significantly less in labor and a roofer would most likely come out and felt it that day as to avoid moisture damage until they could get out and install the shingles.If the damage is next to a dormer or peak and the flashing isn't there or was installed incorrectly, you may be able to call and get them out there.  

Likely moisture and/or rain has been getting through.Mold: General climate in the area is dry, but we get enough major rain showers in the spring and fall that any exterior holes likely allowed water to get inside.Bank offer: Do you think I can actually get the house with an offer at 50K.

This is the first time I am doing this so be gentle:)........