thank you and ooch! will try to pull A/C units and reseal , the material on top of mine appears to be like 1/4 in plywood with a formica type surface on it and all one peice the entire 40' length and a seam on front and rear and down both sides there are some spots where you can feel it give when walking on it but i am 300lbs only panels inside are the first two where the digital antenna comes thru but i replace it and am convinced it isnt leaking there and only places to leak should be the seems and holes cut in it