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step flashing details

tab1 | Posted in Construction Techniques on March 24, 2005 04:13am

Couple of details I’ve been thinking about, but haven’t found answers to: I’m installing step flashing under 3 tab shingles on a roof that butts up against an adjacent vertical wall.

1. Should the flashing cover the adhesive strip of the underlying shingle? (I can think of reasons for yes and no. <g>)

2. Do you nail through the shingle overlying the flashing, thereby piercing the flashing, or keep that last nail just past the edge of the flashing?

Thanks for the help.

Thon

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  1. seeyou | Mar 24, 2005 04:37pm | #1

    1. Should the flashing cover the adhesive strip of the underlying shingle? (I can think of reasons for yes and no. <g>)

    I install my steps so so the bottom of the step is 1/2" - 1" above the bottom of the next shingle. Might hit the glue, might not  - I don't think it matters.

    2. Do you nail through the shingle overlying the flashing, thereby piercing the flashing, or keep that last nail just past the edge of the flashing?

    Nail thru the top of the step flashing which also penetrates the shingle up high. Then the next shingle and the next step flash cover the nail.

    You're almost as paranoid as the people that're trying to kill me.

  2. User avater
    BossHog | Mar 24, 2005 04:45pm | #2

    I kep the step flashing just high enough to keep it out of sight.

    And I was taught to nail the step flashing to the VERTICAL surface so there are no penetrations in it and/or the shingle.

    Sign outside a country shop: "We buy junk and sell antiques."
    1. DANL | Mar 24, 2005 11:19pm | #3

      Yeah, I was told by framer to nail vertical flange of the flashing top the wall--then the siding guy came by and told me not to, to nail the "horizontal" to the roof. But the framer, who signed my paychecks, came back and made me nail to the wall. He said he didn't care if we made it harder for the siding guy, he didn't want penetrations through the roof. 

      1. jimofsmudge | Mar 24, 2005 11:43pm | #4

        I've done a bit of roofing and I always nail step flashing through the roof, mostly because I'm not about to start tearing off siding just to get of few nails in. Also, it makes it very difficult to pull out when it comes time to reshingle. I don't understand the "not wanting any penetrations through the roof" comment. How is putting a nail up high in the step flashing (through the shingle)any different then the four you put in by the tar strip? I've always bent my own steps so I usually need that nail to hold it flat.

        1. DANL | Mar 25, 2005 12:05am | #5

          Good point about another nail in the top of the shingle not mattering. I just did what I'm told. I vas chust following orders! That's my story and I'm sticking to it. ;-)

  3. MikeSmith | Mar 25, 2005 12:08am | #6

    tab... couple things..

    if the gullets of your 3-tab are going to fall out in the step flash area, you don't want to show the flash in the gullet.. so you lap onto the shingle below the one you're covering and the one you're covering only gets lapped about an inch.. the net result is the same as far as vertical coverage

    2d ) nail the tops only... all the nails on the roof to clamp the step flash go just to the side of the step..not thru the step... and watch the gullets again..

    3)   if you don't want the gullets in the step flash zone... you can put a dutchman in to cover the gullet area  this is a piece narrower than a tab  that "stretches " the shingle  to cover  the remaining space.. sometimes used on rake edges if you do a bad layout.. or the rake is out of plumb

    4)  i hate two things on roofs:

    one is siding brought right down onto the roof ( it gets wet and stays wet 0

    and the other is bright aluminum flashing "winking " at me..

     we use colored coil stock for all of our flashings.. and we hole the siding 3/4" off the roof.. it looks like a neat shadow line when you look up

     

    Mike Smith Rhode Island : Design / Build / Repair / Restore
    1. tab1 | Mar 25, 2005 03:06pm | #7

      Thanks for all the advice!

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