Comp shingles: step flashing VS continuous

[Kenton H. Shepard, CMI]

I often see continuous flashing installed at roof to wall junctions instead of step flashing. It's incorrect, but I've never found leaks I could blame on this type of installation. Has anyone?

[Barry Adair]

yes
i'll see if i can locate in/out photo

[Ed Fako]

The requirement for multiple step flashing baby tins sometimes baffles me too, because when I have installed concrete and clay tile roofs intersecting a side wall, the flashings are fabricated to ideally run the full length of the length of the wall.

Same principal, but a different method.

Ed

[John Cahill]

Can you point me to the reference that requires step flashing?

[Marcel R. Cyr]

Originally Posted by Ed Fako

The requirement for multiple step flashing baby tins sometimes baffles me too, because when I have installed concrete and clay tile roofs intersecting a side wall, the flashings are fabricated to ideally run the full length of the length of the wall.

Same principal, but a different method.

Ed

Ed are you talking about what they call Z metal counterflashing and a Pan flashing used with concrete and clay tile roofs?

They are continuous up and down the roof and the pan flashing is made so water will be troughed away from it's 6" edge and down the bottom of the eave, it is extended a couple of inches , cut and tucked under the pan to divert water away from the wall. I guess that would be called Carl's Diverter. ha. ha.

Marcel

[Marcel R. Cyr]

Originally Posted by kshepard

I often see continuous flashing installed at roof to wall junctions instead of step flashing. It's incorrect, but I've never found leaks I could blame on this type of installation. Has anyone?

Kenton, how are you?

The flashing your looking for is as Ed is describing if it is not shingles. You will find it deep in here.
http://www.abouthomes.info/files/ICBO.pdf

There might be another possibility, that if it is a shingle roof, that the continuous flashing had that bubble or hem in it to prevent the water from going under the shingles similar to clay tile.

Marcel
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[Marcel R. Cyr]

Originally Posted by jcahill

Can you point me to the reference that requires step flashing?

Hi. John;

That is reference under the IRC R905.2.8.4 sidewall flashing

Flashing against a vertical sidewall shall be by the step-flashing method.

It is also referenced in R703.7.5, R703.8, R903.2.

Hope this helps.

Marcel

[Ed Fako]

Marcel,

I was referring to the individual baby tin flashings where one individual 2 1/2" X 2 1/2" X 7" goes under each course of shingles where it abutts a side wall.

On tile roofs, this underneath flashing is usually a continuous piece, with a hem bent to channel the downward water flowage.

Ed

[Marcel R. Cyr]

Hi. Ed;

Not familiar with the term baby thins, would you have a picture of it or are you talking about the regular step flashing?

Marcel

[Carl A. Brown]

Baby thins only go up the wall half as far as they need to!

[Marcel R. Cyr]

Originally Posted by cbrown1

Baby thins only go up the wall half as far as they need to!

Carl, is that you? It says you are not a Member.

If that is what they call baby thins, let us leave for the baby and use the right size step flashing. ha. ha.

Marcel

[Dale Duffy]

I like continuous side wall flashing myself...if the installer is sharp enough to keep the material being flashed on the roof.......



Same principle with shingles, a 8" or 10" L-Flashing installed against the framing and roof decking.

[Dale Duffy]

Originally Posted by kshepard

I often see continuous flashing installed at roof to wall junctions instead of step flashing. It's incorrect, but I've never found leaks I could blame on this type of installation. Has anyone?

Kenton,

I would blame the installer, not the flashing......

[Carl A. Brown]

Originally Posted by mcyr

Carl, is that you? It says you are not a Member.

If that is what they call baby thins, let us leave for the baby and use the right size step flashing. ha. ha.

Marcel

yes! I am kinda behind now.

And there is a time and place for all flashings.

The problem I have with the (baby thins) Stucco is suppose to be atleast 2 inches off the roof they do no allow for that application.

And the roofers use them everywhere!

[Carl A. Brown]

Ditto Dale!!