I have a brick veneered house with a clay tile wall construction. I have been trying to find out if I can foam in between the two walls (1 to 2 inchesbetween walls). In the dead air space there is a lot of air movement. I found this out when I put in a new window. This house is very cold and was wondering if foaming this space with a low expanding foam would create more problems. House is 80 years old. I have already built a 2x4 wall on the inside with 3 1/2 inch insulation. It helped some but not what I thought it should. Would foaming this air space make a mold problem?