[RE-wrenches] Flashing vs Sealant... again (is sealant code defensible?)

[Jerry Shafer]

Flashing only
On Apr 11, 2014 9:20 AM, "Troy Harvey" <taharvey at heliocentric.org> wrote:

> 1. I'm interest in a poll of installers who are using flashings vs
> sealant. Now that the flashing market has evolved, what are you using
> today? When did you switch to flashings (if you did). And why not, if you
> still prefer sealant.
>
> 2. Is there a any code defense for sealant systems ? (L-foot sealed down
> to shingles). Does anyone know of a scientific shootout between sealants
> and flashings?
>
> Here is my view: The construction industry is slow to evolve. Sealants,
> clauks & adhesives are not trusted in general, due to the legacy of code,
> and we have a mechanical vs. chemical industry bias.
>
> There is something about seeing a flashing that says, that is a
> "professional job", it must comply with code. And yet, my experience says
> I'd trust a 50-year silicone over a flashing that depends on gravity.
> Gravity should be dependable right? But anyone in snow country can tell you
> in spring, water can go uphill after ice dams form. There are high-rise
> buildings that use "structural glazing" which is just glass and silicone.
> These systems are now getting to be 50 years old without issue.
>
> The cost of flashings have come down in the last few years, but so has the
> cost per watt of installs. With 50 feet in a typical install around here
> that is $150 in feet, lags & silicone. Or $1500 in flashings, and extra
> labor. That can be a large part of a bid, and make you more expensive in a
> competitive landscape. That is fine, if it adds value... but I personally
> don't see the *proven* value, other than the "appearance" of code
> defensibility. Anybody have proof?
>
> thanks,
>
> Troy Harvey
> ---------------------
> Principal Engineer
> Heliocentric
> 801-453-9434
> taharvey at heliocentric.org
>
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