4' x 8' Foam board insulation from Home Depot (3" thick = R-13): $25
bits of wire hanger to connect pieces: free from dry-cleaner
duct tape to secure edges $5
Total cost of materials: $30
Annual heating and cooling cost savings: to be determined next winter
Satisfaction of building it with friends: priceless!
Thanks to the attic stair box construction team, clockwise from top left: Construction Skills, Project Manager, General Mischief, Artistic Direction/Photography.