I have an old home. Super old home. I have no basement or crawl space. I do not have any real access to under the flooring unless I pull up the flooring. My problem/hurdle is that I have cold air coming up from the floor. I can feel air leaks in several areas of the floor. There are some spots that will produce surface temps below 40 degrees on cold days. I feel this is one of the main areas I need to tackle in order to decrease my heat loss. Does anyone have any suggestions as to what needs to be done to correct this problem. General info: All flooring is wood flooring. Carpeting is not an option. (combination of cost and old carpeting was removed, lots of time spent on refinishing the wood flooring) The flooring is old. The kitchen flooring is quite possible the original wood flooring.