If you haul a ladder on the top of your vehicle on a regular basis you are probably familiar with the ladder whistle that is caused by the air rushing by the holes at each end of the rungs. While this can be a temporary annoyance for a one time project, if you are hauling your ladder every day for work like I do it begins to close in on insanity. Well, here is how I solved my ladder whistle problem. I put the ladder on saw horses & sprayed expanding foam in each rung hole, then when the foam had set up I went back & trimmed it flush with a long razor blade. Even if you don't haul a ladder on a regular basis this can still be of benefit in preventing things like a wasp nest & the accompanying sting when you drag that ladder out this spring for your projects around the home.