I had 3 ventalation turbines installed last week from roofers that I don't think have installed them in the past. The said my roof was an 8 degree pitch and adjusted the
Turbines accordingly. We got our first big rain storm last night and I went up in the attic
And sure enough water was raining in through the inside of the turbine. It was leaking
In the middle (turbine part) not around the edges where they sealed it. Did they adjust
It wrong? I bought the turbine at Lowe's and I'm not sure If I should have them taken
Down or just adjusted. One of the turbines which is located on top of my garadge does
Not turn as much as the others.

Are the turbines above the peek of the roof? To work proper they should be at least 4 inches above the peek,if not they will only work when the wind direction is come from 2 directions like north and west.Make sure they are level,if not this will allow water to enter from the sides because of the tilt, also make sure they are properly sealed to the roof,they my look OK but I've seen them leak even if I though it was a perfect seal.Good luck.

A turbine like you describe is not rain proof. Inspect it and picture what happens when rain drops hit it on a slight angle, rain can enter between the turbine blades even if they are spinning.

I put aluminium platters in the attic, directly under the turbine openings. The theory is that any water that makes it between the blades is caught by the platter, and then has a short distance to evaporate out of the attic i.e. back up the hole. I can't say how effective this is, but it should be better than the water hitting the insulation below the turbine.