Thought I had a leak because the roof was spongy in places. But upon removing the shingles the plywood was dry...to dry. Roofer said it dry rotted from improper ventilation. There wasn't any roofing vents on the house. Now the plywood on the garage was ok because it has three vents on it but I had to buy 40 sheets of plywood for the house which cost me an additional $500 on top of the roof job?