Originally Posted by grandmalois
I too have water leaking into my microwave(OTR). It started after we had our conventional roof replaced with metal. The first time it was pouring rain. The roofer came back and replaced the roof jack and resealed it. It was ok until a couple of month later when a very small amount of snow started to melt and again there was water in the microwave. Again they came back and caulked all around the vent. I have been in the attic and could see the water coming down the outside of the vent pipe. Most recently, when the temps were in the teens, I got a lot of water in the microwave. I had used the unit for less than 10 minutes and at least 2 cups of water poured out of the openings on the top inside of the microwave. The only thing that changed other than the type of roofing is that they extended the vent about 2' above the roof, where it was flush with the roof before. I am now wondering if this is a condensation problem rather than a leak. Nothing was melting from the outside the last time, as it was too cold. We have had this microwave for several years with no problems. Should the vent piping in the attic be insulated?
Lois, welcome to House Repair Talk, sorry to hear of your problem leak. Condensation may be the reason you are having a water issue, but if you are experiencing a great deal of water, I'd first guess improper flashing on the vent hood. Hard to tell over the internet. Post some pics of the problem areas if you can.