They must make different brands, or quality of brands. If you are talking house and not barn, I've had two homes that I purchased that had them when I pirchased them, and as they were spinning, you could actually see through them, so apparently lower quality. Both houses ended up with extensive water damage caused by rain water either just getting into them, or being sucked into them. In the first home, the drywall ceiling just ended up cracking and collapsing not long after I purchased the home. In the second home, it ended up sagging from the weight after getting wet each time it got wet. In both cases, I ended up having to replace the drywall ceilings. From my experience, for what those type of vents are worth and cost in the long run, it just isn't possible to throw them that far. Both of my roofs ended up being tearoffs when redone, not because of the vents, but because code does not allow more than a second layer of shingles by me, and instead of going a second layer of shingles, I preferred to remove the existing bad layer, and replace any plywood that needed replacing, including the pieces with the holes cut in for the vents. I went with Cobra vents that ran the length of the peak, with increased ventilation in the soffets, and plenty of batting down in the ceiling. I do not have increased heat loss as noted because when the snow comes down, it isn't melting off the roof, or generating ice dams along the edges. Cobra roof vent goes down after the shingles the length of the peak that has been cut back at least 1" on either side, not more than 2", and then you cut extra shingles down into like 8"x8" squares, layed over the top of the Cobra's length, and nailed down with smart roof nails that go into the roof, but stay out about 1" because of the nylon sheath around them. Cobras vent and keep bugs and stuff out.
On my barns and tool sheds, I've done similarly with peak vents the entire lengths on steel roofs. To keep bugs, bees, and birds out, before I put the steel roofs on, I cut the lengths of the peak, layed down a layer of screen, then a layer of 1/2" square chicken wire, then another layer of steel screen. Keeps stuff our and stuff from digging or breaking through. Then I put down the steel roofs, then the steel peak vents. Have never had a problem.
Want my advice about those vented turban vents? If anyone gives you one, be nice and thank them, but after they leave, toss it/them into the trash, and if they ask where they are, why aren't they on your roof when they come over, tell them that burglars broke in and stole them before you had a chance to put them up, along with the cat.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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