What to do about where siding meets concrete.

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Old 01-06-20, 07:39 PM
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What to do about where siding meets concrete.

I have a dilemma that I need to resolve. I have siding that meets the concrete on a patio addition behind my home. The siding is starting to rot away after years of getting wet. I'm wanting to replace it but I want to do this the correct way if there is one.

Nothing I do will keep that area dry so what would you suggest to place so I can keep this stuff from rotting away quickly? I don't have photos but imagine a wall resting on a concrete slab, thats what I have.

There isnt an option to remove this completely as we're using that room for storage. Please help if you can.
 
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01-08-20, 06:02 PM
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Snap a chalk line up about 8" or so and run a skilsaw down that line to cut off the siding. On the inside, put 2x4 blocking horizontally between the studs and behind the cut edge of the siding, and fasten that blocking to the framing. Outside, slip a z-flashing up under the cut edge of the siding... allow about 1/2" gap between the cut edge of the siding and flashing so that you can paint it. Renail the siding to the studs and to the new blocking.

Where the concrete meets the building, install an L-shaped flashing. Run a bead of sealant on the concrete and set the flashing into it and fasten it to the framing. Then install a pvc 1x8 over that flashing, and under the z-flashing.
 
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Old 01-06-20, 07:59 PM
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Siding should never meet concrete, because your siding mfg's installation instructions surely dictate that it should never be installed closer than 2" to a concrete surface such as a sidewalk or patio.

Also concrete poured next to a wall should always be at least 1 or 2" lower than the foundation so that water is not able to run under the bottom plate of the framing.

It's hard to make any recommendations sight unseen, but in short, the siding needs to be kept above the concrete, and a metal flashing would take its place. Another option might be a pvc trim board topped with a z-flashing on the lower 6 or 7", (google water table trim) so that the siding would stay far above grade.
 
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Old 01-08-20, 04:17 PM
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I've tried to insert a photo that is small in size but I get an error that I've exceeded my quota.
 
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Old 01-08-20, 05:53 PM
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Here are requested photos
 
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Old 01-08-20, 06:02 PM
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Snap a chalk line up about 8" or so and run a skilsaw down that line to cut off the siding. On the inside, put 2x4 blocking horizontally between the studs and behind the cut edge of the siding, and fasten that blocking to the framing. Outside, slip a z-flashing up under the cut edge of the siding... allow about 1/2" gap between the cut edge of the siding and flashing so that you can paint it. Renail the siding to the studs and to the new blocking.

Where the concrete meets the building, install an L-shaped flashing. Run a bead of sealant on the concrete and set the flashing into it and fasten it to the framing. Then install a pvc 1x8 over that flashing, and under the z-flashing.
 
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Old 01-08-20, 06:42 PM
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Why am I cutting the siding at 8"? Is that to not replace the entire siding or something else I'm missing.
 
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Old 01-08-20, 06:49 PM
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Maybe reread what I wrote above until it makes sense. You are removing the lower 8" of siding and putting a pvc 1x8 there that won't rot.
 
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Old 01-08-20, 08:24 PM
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Didn't see that, got it now.
 
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Old 05-04-20, 01:58 PM
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Any idea where I can find the l flashing for this installation? I've gone to Lowe's and Home Depot but they draw blank when I asked about it. I've decided that instead of using this siding I'm going to try and install some cement siding. That way I don't have to worry about this problem again.
 
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Old 05-18-20, 09:18 PM
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Asking one more time about the flashing
 
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Old 05-19-20, 03:06 AM
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It's called a Z flashing, here is one example - https://www.lowes.com/pd/Union-Corru...ashing/3499684
 
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Old 05-20-20, 07:11 PM
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I dont see how that will sot flush on concrete
 
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Old 05-21-20, 03:03 AM
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It goes under the old siding not at the concrete.

Re-read XSleeper's second post.
 
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Old 05-21-20, 05:29 AM
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I've decided that instead of using this siding I'm going to try and install some cement siding.
Cement siding isn't impervious to water. It has to be kept a minimum of 2" above concrete.

If for some reason you need to put a flashing against the concrete you could use something like this or make your own with a metal brake.
 
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Old 05-21-20, 07:31 AM
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Earlier you had mentioned using a PVC board to run across and to affix the flashing to that and the concrete. It had been suggested to me that I could avoid the PVC altogether and just go concrete siding.
 
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Old 05-21-20, 08:02 AM
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I have nothing to add.
 
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Old 05-21-20, 11:47 AM
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The old siding is being removed because it's falling apart. The plan is to add Hardie Siding instead. Your comments were that the cement siding would not be impervious to moisture okay if it's not then what in the world am I going to put down so that I don't end up with rot again? The response was to put a piece of flashing on the concrete for the old siding yes. But if I'm removing it that I need to find a better solution. Whenever someone ask a question in this forum they may have no experience in this field so they are looking to you all as experts to try and get the solution fixed. I don't have money to pay for a contractor to come over here and do this so I have to get some help on my own.
 
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Old 05-21-20, 12:12 PM
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Put PVC trim against the concrete and your siding above the PVC. The Z flashing goes under the siding and over the PVC to prevent water from getting behind the PVC and into the framing.
 
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Old 05-21-20, 03:18 PM
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Post 2 and 5 told you everything you need to know. If you dont want to do it that's fine, I cant make you. But a PVC 1x8 wont rot and it gets your siding up off the ground 8" so that it is out of the majority of splashing. Most siding mfg's recommend 6" to grade. 2" is the bare minimum. It doesnt look to me like you need any flashing on the concrete but your photos are fuzzy.
 
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