On recommendation, we just put spray foam in an un-vented attic crawl space above a porch-style addition to an old home -- we sprayed the L (bottom and side-wall, not the underside of roof). The existing space was poorly insulated and caused ice-dams. I just peeked in the hatch and it was roasting hot in there (hot summer day here). Is the lack of ventilation a problem? There is no good way to vent this space (unless through the roof??) Do I need to worry about excessive heat or fumes building up in that space?