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Roof to sidewall flashing detail

Musclehead | Posted in Construction Techniques on August 2, 2008 11:58am

Hi All,

I’m having a bit of a skull cramp over a flashing detail for the intersection of a roof and sidewall at my home and would welcome any recommendations. Here is the skinny:

Construction is all new. Sidewall is to be sheathed with DensGlass Gold to provide the drainage plane for Dryvit EIFS.

Should I install the step flashing before I apply the DensGlass or would it be better to install the DensGlass and flash to it then apply a 9″ width of bituminous membrane such as Blueskin with the area preprimed with a suitable primer to seal the joint between the step flashing and the DensGlass? I’m leaning towards the latter.

Salut

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Replies

  1. theslateman | Aug 03, 2008 12:08am | #1

    As would I

  2. Piffin | Aug 03, 2008 12:14am | #2

    Good question.
    I got to thinking it through because over windows you would have a similar flashing concern if using the denshield as a drainage plane.

    It looks like they have a product like a vycor for flashing sealing instances like this...
    "Perm-A-Barrier
    ¯
    Wall Membrane is a tough,
    self-adhering, self-sealing waterproofing
    membrane for air and vapor barrier
    applications. Consisting of 36 mils of
    rubberized asphalt integrally bonded to a
    4 mil high-density cross laminated polyeth-
    ylene film, Perm-A-Barrier Wall Membrane
    is an impermeable air, vapor and water
    barrier. When installing Perm-A-Barrier
    Wall Membrane over DensGlass Gold, the
    surface of the DensGlass Gold sheathing
    must first be primed with Perm-A-Barrier
    WB Primer. Perm-A-Barrier WB Primer is
    a water-based primer, which imparts an
    aggressive, high-tack finish on the glass
    mat substrate of the sheathing.
    "

    I'm betting they have a detail drawing someplace on their good website, but I can't find it yet...
    "Get Support for Gypsum Products
    E-mail us or call the Technical Hotline
    1-800-225-6119 (Monday - Friday 8AM - 5PM ET)."

     

     

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    1. User avater
      Musclehead | Aug 03, 2008 12:25am | #3

      Sounds like it is the same type of product as Bakor Blueskin/Bakor Aquatac. Thanks to you both for your replies. As my 12th grade physics teacher told me, always go with your gut feeling....I wish I had passed his class.

      1. Piffin | Aug 03, 2008 12:30am | #5

        I'm just not familiar with blueskin product name.Does the EIFS maker recommend the gold with no other drainage plane between? 

         

        Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!

        1. User avater
          Musclehead | Aug 03, 2008 12:53am | #6

          I'm not sure if Blueskin is distributed in the States. DensGlass is the substrate of choice for a drainage plane behind EIFS here in Southern Ontario. The EIFS application is a trowelled on adhesive (applied with a notched trowel) with EPS pressed into it. The joints in the DensGlass are taped and filled prior to the adhesive being applied. The adhesive is rated as an air barrier and the notched trowel provides channels for water to run down and out of the assembly.

          1. Piffin | Aug 03, 2008 05:52am | #7

            Thanks for the primer. 

             

            Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!

  3. Piffin | Aug 03, 2008 12:28am | #4

    http://www.google.com/url?sa=t&ct=res&cd=10&url=http%3A%2F%2Fwww.tecnigypsum.com%2FHojaTecnica%2FDessGlass.pdf&ei=cM-USPy8JajiiAGVkqidCg&usg=AFQjCNE0hr2vLNbWFE-5oaj8GmM8fHA78A&sig2=EYUY8fOOD6AFLKP2ECll0w

    The way I read this, the gold is not a drainage plane in and of itself. It is merely a weather resistant material able to protect itself for up to six months of exposure, but iot requires proper mositure barrier and flashing detailing liek any other sheathing or the warrantee on it is void.

    So I would plan to do the sheathing, then underlaymnet on the roof, then the metal flashing, with a vycor sealed over it, then the wall wrap and drainage plane of=ver the metal flashing. Greengaurd might be my choice for that.

     

     

    Welcome to the
    Taunton University of
    Knowledge FHB Campus at Breaktime.
     where ...
    Excellence is its own reward!

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