Rattle from Exhaust vent: "When our shingle roof was changed to a metal roof ..." - Guest User (10/10/2002) | Ventilation | Archive

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When our shingle roof was changed to a metal roof recently (still in progress), the flashing for the gas stove exhaust pipe was changed from all metal to a roof jack/flexible boot. It did not rattle for a few days, but now it sounds like it's rattling. The exhaust pipe just above the stove seems to vibrate more than before. The winds are moderate at about 40 mph. The old flashing did not rattle with winds as high as they get or about 110 mph. Do you think it's the new type of flashing/boot, or would you suspect that something is loose? What kind of shoes will grip the metal roof (6/12 pitch)? It has a good bit of silicone residue, which makes it real slippery. Thanks, Mark	Guest User 10/10/2002	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/1230/find/
I am not by your description whether you are talking about the insulated flue pipe on a standard gas fireplace or a pvc exhaust on a high efficiency unit. Regardless the purpose of the roof flashing is not hold the pipe in place but to allow for differential movement between dissimilar building elements while keeping the weather out. I suspect that the original installation of the pipe may be missing the retainers that hold it in place and have been relying on the roof flashing. There are certain clearance requirements to be maintained by local codes. The flexible flashing detail is a very good detail and in allowing the vibration is allowing for movement as desighned. TRalk to both your roofer and the installer of the pipe if possible to see if the retainers have been put in. I suspect that you will need to remove the flashing and have one installed and then reflash.	Allan Reid Dura-Loc Roofing Systems, Inc. 10/11/2002	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/1231/find/
Thanks Al, It's a Waterford gas stove (80% eff.). It has a direct 6 inch metal vent. It goes through a square metal box at the ceiling. I will contact the stove company that installed it 4 years ago. They keep good records, so they should know how it was installed. I will ask them about these retainers you mentioned. Unfortunately, rural Montana has no inspection requirements for code. I suspect the clearances are good, but I'll have the stove company check them out. The roofers have very little knowledge about metal roofing, so I doubt they know much about the stove venting. I appreciate your help, Mark	Guest User 10/11/2002	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/1232/find/
Al, I got in touch with one of the guys that installed the gas stove. He said either the vent pipe is not in the correct locked position or the retaining clamp, you spoke about, is not installed or not tight enough. Of course, the roofers have not returned my phone call from yesterday or this morning, so I'm getting the stove installer to make the repair or correction. Looks like a half of tube of silicone caulking around the roof jack flange, but it can be cut with a razor knife. I'm glad they didn't use the urethane sealer! Thanks to you, I believe this problem will be solved soon. Have a nice weekend, Mark	Guest User 10/11/2002	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/1233/find/