I had leak in my metal roof in the garage, and a couple of roofers looked at it. They both said rain could be blowing in under the ridge vent caps. For those vents, the uphill end of the panels is bent up at 90 degrees under the cap. it is bent up around 3/4" to 1" high. The point where it is bent ranges from 1 1/4 to 4/34 inches back from the edge of the cap. One of the roofers said they could put pieces of rigid foam under the ridge caps. Later I asked his company more about it, and they would try to leave a 1/4" gap between the foam and the underside of the cap. They said they normally use 1" foam. I am interested in doing that job myself, because it doesn't sound that hard, and the companies want a lot of money. I would like to do what the roofing company said and leave about a 1/4" gap between the top of the foam and the underside of the cap. That seems difficult because, because there is a 1 and 11/16" space under the cap, and 1" foam would leave an 11/16' gap, which is not much different from the gap between the ends of the panels and the underside of the cap. If I got some 1 and 1/2" foam, and used that, with say 1/16" for the foam glue, the top of the foam would be 1 and 9/16" inches high, leaving a 1/8" gap. I guess that would be a little too small for the air circulation. It would be nice if they made 1 and 3/8" foam, but I haven't seen that.

By the way, I got up on the roof and did a hose test with the openings for the vents. I tried pointing the water straight down on top of the ridge cap. My brother was underneath, and he did not see any leaking.

Then I got the water landing by the openings at about a 30 degree angle off the vertical. I figured that would simulate windy, rainy conditions. My brother was underneath in the garage, and he said he saw water leaking. The spot where it leaked onto the floor was different from where the original leak came down. It was different by a couple of feet or so.

Does anyone have any suggestions on how to do this project?