Duck(ouch)under A duckunder is a good place to put some surplus plastic foam. I don't have a duckunder, but I put some on the entrance to the crawlspace, and it has been handy several times this week as we put Xmas stuff away. (Crawlspace: a half-height section of basement, caused by house builders who are to cheap to excavate fully.) Our entrance is not over 4 feet high. Just wondering: does the expanding foam in a can stick well enough to use here?