When non-engineers hear the term “building envelope” they typically think of drafty old homes with leaky windows and steam radiators overheating a bedroom while uninsulated parts of the house remain frigid. Cash for Caulkers (the currently proposed and stalled Federal legislation) epitomized the fix for this problem – create new green jobs by arming construction teams with caulk guns for sealing old windows and doors and insulation to stuff into hollow walls, saving taxpayers money and helping our economy.