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Flashing wood siding at a masonry surface when the concrete is different widths


sspeed's Avatar
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05-24-14, 05:01 PM   #1  
Flashing wood siding at a masonry surface when the concrete is different widths

I'm working with what I have with the previous owner's build of this wall and at present am re-siding it.

The wall was framed down to the concrete pad. At some points, with siding on, the wall will be 4 inches from the concrete edge, at other points it's about an inch. I'm not sure why he did it that way, but short of tearing the whole room off I'm stuck with it

Looking at the siding install instructions the flashing should go under the siding and Tyvek wrap, over the concrete and the drip edge should extend past the concrete.

Home Depot has lots and lots of z-flashing sizes, but I'm not exactly sure how I flash this when the wall is different measurements from the concrete edge.

In the below picture it's 4 inches at the farthest point and about 2 at the closest. How do I flash this short of having my own break to bend my own flashing just right?

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05-24-14, 05:31 PM   #2  
Sheesh. Well, IMO you should probably first of all take a cup grinder to that concrete and grind a nice even bevel on it, so that water will shed away from the OSB sheathing. Once the concrete is bevelled, it no longer becomes important to use z-flashing. Then I would probably use something with an angle, like gutter apron installed upside down, as your flashing. Can't say exactly what you will find where you go shopping. But I'd run a large bead of sealant along the base of the OSB, then push the flashing into it so that it's completely sealed. IMO that OSB should not be sitting directly on the cement since the cement will get wet that will just transfer into the OSB like a wick.

 
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05-24-14, 08:35 PM   #3  
Thank you Xsleeper! You are always so helpful! The pic doesn't show it well, I have the OSB sitting about 1/8"-1/4" off the cement. Is that enough?

I hadn't thought of grinding the concrete to a beveled edge, that's a great idea. I'd never heard of a cup grinder, but it looks like it's simply a diamond wheel I put on my die grinder?

I see flat wheels that look like they are used with angle grinders, and beveled wheels for use with die grinders like the Dewalt DW4965. I don't see anywhere that I can get the beveled wheels locally in Denver, I may have to get an angle grinder as those wheels seems to be all Home Depot types places have.

My neighbor restores Model As and has a brake, so I guess I'll bevel the concrete, bend my own flashing and then install it like you mentioned.

 
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05-24-14, 08:47 PM   #4  
You're certainly welcome- not sure what you planned to use for flashing but its probably not a good idea to use aluminum as a flashing next to concrete as it won't last as long as steel will. Any box store will sell a cup grinding wheel similar to this:



image credit: home depot dot com

 
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