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TOPIC: Flashing

Flashing where roof meets wall

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My house is sided with T-111, I am in the process of adding a garage and the roof will need to tie into the wall. What is the best way to flash where the metal roof meets the siding?
Guest User

9/18/2004
Ideally, the siding should be removed and a flashing should be installed which goes up under the siding and then intersects with the roof in the manner prescribed by the roofing manufacturer in their manuals.
Guest User

9/18/2004
The new house we are building has a porch that meets a wall on the second floor. We are planning to put a standing seam metal roof on the porch and the wall will be lap siding. I understand that the flashing must go under the siding, but I am concerned about the workers walking on the metal roof while installing the siding. Is it possible to install the flashing and the siding and then slide the metal roofing under the flashing? There is no room for scaffolding and the roof is a 6/12 pitch which would make walking on the metal difficult. Any ideas?
Guest User

9/25/2004
It is possible to put the flashing in first and then the panels but it is easier to do them at the same time. Even with the flashing, you still need a good closure at the top of the panel to help prevent water from blowing up in. Experienced metal roofing installers will be able to walk the roof withouit damaging it.
Guest User

9/26/2004
It's not the roofers that worry me, it's the guys that will be doing the lap siding that is my concern. My hope was that I could get their part done without having them walking back and forth on the roof while nailing the siding up. There is over a 100' of wall that meets the metal roof. That is a lot of trafic while the siding goes up. What normally keeps water from blowing up under the flashing?
Guest User

9/26/2004
There are a couple of ways of closing the top end -- sometimes with a Z Channel that is sealed into place, sometimes by turning up the end of the panel and then sealing, sometimes using a foam closure strip. I like systems which actually have the wall flashing lock into a sub flashing or something attached to the panels themselves. I would suggest having your roofing contractor sketch out some possible flashing methods and then reviewing them with him to find one that is reasonably good but would allow for the wall flashing to be pre-installed.
Guest User

9/27/2004
I am a MR Contractor. I have to ask advice for my own piece of mind.Keep in mind this is renovation, not new construction. When a Roof 's Rake meets a wall on a split level the siding is applied down on the roof. I am using a 7/16" high profile metal panel.The siding on the house is 8" cedar lap. I cut 1 1/2" (the lowest setting I could get with a circular saw) from the siding where it met the shingle roof so I could slide my endwall flashing (3 1/2")under the siding. This left 1" of the endwall flashing exposed where the cedar does not meet the roof anymore. The customer told me that is not professional work and no one who calls themselves a professional metal roofing contractor would do it that way. he is saying that I need to remove all the siding from the wall and run it tight to the roof the way it was.The customer is always right,and I know that. I will probably do it the way he wants just to save face, and to get paid for the job. I want to know if this is the way you would have done it or am I wrong?
Guest User

9/22/2005
To keep from creating a water trap which could cause the siding to rot, I think what you did os okay. Sometimes the homeowner must understand that what is aesthetically pleasing to them is not necessarily technically the best way to go. I would see if you can't get the roofing manufacturer to cast an opinion on this. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/23/2005
I just spent 60+ hours repairing rotted siding on a house for a customer, and installing vinyl siding. The original siding on the dormer was tight to the roof, as well as the corner trim pieces. The correct way to do it is to leave 1" between the siding and the roof surface. This will leave an unsightly gap with flashing showing, especially on a steep pitched roof, but that can be minimized by painting the flashing black, or to match the color of the roof or the siding.
Guest User

10/22/2007
Thank you for your insight. Todd Miller
Todd Miller
Isaiah Industries, Inc.

10/22/2007
I have the same problem. My house has wood siding. I decided to build a Car port. I did not take off the siding and at the point I am now, it is impossible to remove the sisding. Car port is almost done, and only thing I need is install the flashing. Any advise appreciated.
Guest User

11/22/2007
Is there anyway you can make a 1/2" deep sawcut into the siding to insert a flashing? Todd Miller
Todd Miller
Isaiah Industries, Inc.

12/1/2007