WITH soffit and ridge vents, my townhouse (used to) get over 135-degrees in the attic. I put in a radiant barrier, and that dropped it a fair amount. I think you'd find 135 is too low. I'd be very careful about what I put up there for storage...some things just don't like the temperature and humidity extremes common for up there. You really should consider some ventilation, and a radiant barrier would help as well. A typical asphalt roof can get way too hot to touch in the summer, and that will heat up the roof decking a LOT on a clear, sunny day.