Foam sealant for hip ridge covering

Since no manufacturer makes foam pieces for hip rooves and especially because my hips are not standard 45° angles, plus one is in the path of weather, I have hesitated to switch to a metal roof because of the coverings for the hip ridges. Someone suggested to me to use a foam insulation on the hips to seal them to the roofing sheets, and just keep standard venting on the ridge vent on the top. Does anyone have any suggestions and or horror stories regarding this?
Todd Miller
Isaiah Industries, Inc.
9/7/2005
I am not sure what profile of roofing you're planning to install but, with most systems, the manufacturer should be able to give you a detail for an all metal hip closure. Then you can use a ridge vent on the ridge.
Guest User
9/8/2005
So far I know of no manufacturer that has an adequate ridge vent for the hips. All the ridge covers and foams are for a ridge vent that is perpendicular to the metal roofing. And the generic metal ridge covers are only about 12" wide (lapping 6" on each side) and no foam to fit under it to stop the rain. But then even if they did, it would likely be for a 45° hip. Since I have a hip on the NW corner ( and that is not at a 45), weather is likely to get pushed up under a standard metal ridge cover and so I have to have something inside that space to stop the water before it gets to the edge of the roofing panels. So far, the only suggestion I have gotten is to use that aerosol foam insulation because it will expand to fill the cavity. That's why I was asking. BTW, if you know of one of your companies that has a decent hip ridge cover, let me know the brand. Thanks, R-
Todd Miller
Isaiah Industries, Inc.
9/8/2005
Thanks for the further explanation. Fact is, I do not know of anyone who offers a vented hip. It is not done with standard shingles to the best of my knowledge either, due to fears of weather getting through no matter what you do. Now, that said, I was involved with one project where we custom-designed a vented hip for a particular home in northern Indiana. It has performed well for many years. My suggestion was a metal closure for a non-vented hip cover. If ridge vent by itself will not provide adequaye exhaust ventilation, then you may need to look at some additional static or power vents near the top of the roof. It sounds like you're interested by metal but disturbed by what seems to be a lack of consensus or "standardization" on flashing details, etc. That is understandable. Fact is, there isn;t much standarization because there are so many profiles of metal roofing available. By my guess, there are well over 300 different profiles of metal roofing made in North America by almost as many manufacturers. My best advice is to find a product or two that you really like from an aesthetics and expected performance standpoint and then work with the manufacturers' technical departments to get answers to your questions. If the manufacturers you choose are truly dedicated to the residential end of metal roofing, I assure you that they will be able to help you and answer your questions, no matter how complex of an area you may be dealing with on your roof.
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