i was wondering if there is a gadget to determine how much insulation is inside a plaster and lathe wall? i know it settles and it was blown in all over in about 1985. we live in iowa and each year we keep feeling more drafts? we had the house sided and insulated with pink board very thin in 87 but still feels drafty. we had new windows installed in 1996 but i am at the point of putting plastic on them have for about 2-3 years now because they were icing over on the inside. have contacted the manufacturer but to no avail no real explanation. they leaked air? from the bottom where it closes and from the latch seals across. they act like the argon gas is gone but we don't have moisture between the glasses. who knows just one more thing with an old house.