[Greenbuilding] window flashing diagrams--Lstiburek?

[Keith Winston]

Hi Reubenl,

As Bruce noted, Flexwrap was just where I was going to point you. The 
Flexwrap installation is the cleverest and most thorough approach I've 
seen. They have products for non-flanges as well as flanged windows. 
You'll have to remove the windows, building-wrap the wall, and then do 
the flashing. There's a clever little dam optionally installed on the 
sill behind the window, and flashed integrally. Unfortunately, I don't 
see that in the installation instructions they provide. They included 
that, but only barely mentioned it, at a demonstration of Flexwrap I saw 
at a conference. Here's the installation instructions:

http://www2.dupont.com/Tyvek_Construction/en_US/assets/downloads/InstallGuideFlashing_K16280.pdf

When they refer to a "Brick mold window or door", that applies to any 
unflanged window or door. There's a special product for that purpose, 
Straightflash VF, which is a partially-double-sided flashing tape. I 
hate to be such a schill for a Dupont product, but they really figured 
out all the angles on this one, it seems to me. Every other window 
install technique I've seen has weak points, in comparison.

Keith


Bruce Donelson wrote:
> I am about to tackle a South-facing gable on which I have hitherto not
> managed to keep rainwater out when the wind blows hard. It is a wood sided
> facade with wood trim around two outward opening casement windows. I have
> caulked and caulked, but to no avail. I suspect the windows. I expect to
> take all the siding and trim off and see what can be done to better manage
> water intrusion around the windows. My guess from past discussions of this
> subject on this list is that Joe Lstiburek's books and papers are a good
> place to start. My question is whether there are basic diagrams (or
> descriptions) in his books or anywhere else (his books on moisture
> management are pretty spendy) that show how one might construct flashing for
> the purposes of redirecting any water making it past or around paint, caulk,
> siding, and trim?
>
> Reuben Deumling
>
>
> You can find some good installation diagrams on Dupont's web site. Search
> for Dupont FlexWrap, then look into the PDFs for the technical details.
>
> Our crew backs up this installation with a bead of caulking on the inside of
> the window to the FlexWrap as it comes out below the base of the window. We
> figure that any water leaking internally through the window will then be
> forced to exit the opening to the outside.
>
> Bruce Donelson
> A Better builder
>
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-- 
Keith Winston
Earth Sun Energy Systems
Hyattsville, MD 20781
301-980-6325
send me mail at 
keith at the company below
www.EarthSunEnergy.com