the proper way to join two different peaks

Tammy Lawrence
Hi. I have an existing house with a 12/12 peak and metal roof. We have just added an addition to the side of this house. This addition has a 12/5 slope and joins at the load bearing end of the trusses forming a kind of T shaped peakline.(see attached photo). Both the house and the addition have metal roofing with furring strips underneath attaching them to the trusses. My question is this, what is the proper way to join the two to keep water and ice from backing up? My contractor cut the original roof to accomodate the addition and ran a piece of flashing bent to meet both angles under the two. We're concerned that if we get a big snow storm and the snow sits there with the sun shining on it, that it may melt and back up. He's mentioned filling the ridges with caulk to prevent this. Is this good enough? He was unable to use the foam inserts under the ridges at the flashing due to the fact that each roof is cut at an angle to accomodate the other. Thanks!
Todd Miller
Isaiah Industries, Inc.
I would first of all go back the the roofing manufacturer and ask what they suggest for a valley. However, yes, sealant and tape sealant are common, and the valley pan should be bent up on the endges in a way which directs water down to the bottom of the roof.
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