Connecting a wall, and step flashing

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woodsy
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Joined: Sat Feb 08, 2014 9:02 am

Connecting a wall, and step flashing

Post by woodsy » Sat Feb 10, 2018 3:26 am

I am building a 8'x14' porch this spring at my cabin. The one wall that will be connected to the cabin has nothing to connect it to but 5/8" T1-11 siding. My idea is to use toggle anchors, screws, and construction adhesive to connect the one porch wall to the cabin. Is this the way I should be doing it, or is there some other way of connecting the porch wall to the cabin? The other wall will be fine I am connecting that to a stud in the cabin wall.
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Next question, I am going to use step flashing for the the roof on the porch,the flashing isn't going to be covered by any siding or anything else. There are grooves in the T1-11 siding what should I do to prevent water from going behind the step flashing? I am thinking roofing cement or silicone.
Next question, what do you do with step flashing at the peak of the roof? I mean how do you finish it, bend it over the peak, or just stop at the final coarse of shingles?
Sorry to say, but I think I will have more questions as time goes on. Thank You for taking the time to answer these quetions and all the information in your videos they are all a big help!


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Shannon
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Re: Connecting a wall, and step flashing

Post by Shannon » Sat Feb 10, 2018 3:34 pm

You can use adhesive and screws/nails to att h that wall to the t1-11.
As for the flashing that will only work for a short while before it starts to leak. That flashing really needs to be behind the t1-11.
I would remove the t1-11 and install blocking between the studs following the slope of the roof so that you can install the flashing to that, then the t1-11 can be cut and re-installed over the flashing .
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woodsy
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Joined: Sat Feb 08, 2014 9:02 am

Re: Connecting a wall, and step flashing

Post by woodsy » Sun Feb 11, 2018 6:59 am

Thanks for your reply Shannon, but removing t1-11 is to involved, and really isn't an option. After reading your reply I am thinking of cutting a shallow groove in the t1-11 following the contour of the flashing. Then placing some sort of z, or j, channel in the groove to act as a rain gutter attaching with construction adhesive. Now I really don't think this is the best solution as far as what channel to use or how to attach it, but once I look at some options this may work. I don't like cutting into the t1-11 but I don't see any other option to stop water from going down the siding. Let me know if this has any potential, if not, I will scrap the idea.

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Shannon
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Re: Connecting a wall, and step flashing

Post by Shannon » Sun Feb 11, 2018 7:44 am

That is better then just butting up to it and trying to keep it sealed.
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A. Spruce
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Re: Connecting a wall, and step flashing

Post by A. Spruce » Sun Feb 11, 2018 11:59 am

I prefer a z-bar flashing over the top edge of the step flashing. You can cut the siding about 1/2" above the step flash and just pull the edge of the siding out to install the z-bar. The z-bar should have at least 2" flanges.

Don't forget to pull any nails in the path of the saw and relocate any nails that will perforate the z-bar within an inch of the step.
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woodsy
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Re: Connecting a wall, and step flashing

Post by woodsy » Sat Feb 17, 2018 4:57 am

I am going to go with the z bar flashing, I have added it to the list of materials to order. Thanks for all your help!

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