Al, Someone did some tests that were on the Chaski list a couple of years ago and claimed that lagging did not help measurably on our small stuff. Why don't you do as I did with the Newbie boiler and use narrow 1/8" thick wood strips for insulation/lagging? Looks pretty on an upright boiler and keeps you from burning your hand if you accidently touch it. Jesse MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.