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Old 01-17-2009, 10:58 PM   #1
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T1-11 channel


I don't know what this type of metal channel is. It is used to butt T1-11 together at the top. What is the required overlap between this type of channel. Also, should I apply caulk to the metal before adding the top piece of plywood.

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Old 01-18-2009, 01:50 AM   #2
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T1-11 channel


Z flash or step flash, depending on where you are, and no.

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Old 01-18-2009, 08:05 AM   #3
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T1-11 channel


you should prime all six sides i dont think it would hurt to caulk the top ove the panel before the z flashing but never caulk the joint ontop of the z
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Old 01-18-2009, 07:26 PM   #4
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T1-11 channel


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Originally Posted by strublesiding@optonline.n View Post
you should prime all six sides i dont think it would hurt to caulk the top ove the panel before the z flashing but never caulk the joint ontop of the z
Can you clarify why you should never caulk the joint above the z flashing? Once I put the z flashing on, should I caulk the seems it creates (bottom of z flashing and butt joint between top piece of siding and flashing)?
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Old 01-18-2009, 08:21 PM   #5
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T1-11 channel


I was reading online that I should put a 1/4" gap between the z flashing and top piece of t1-11. This is to prevent wicking. Is this the best approach to take? A 1/4" gap doesn't seem to be aesthetically appealing. Is there anything wrong with just leaving no gap and caulking the seam?
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Old 01-18-2009, 08:37 PM   #6
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T1-11 channel


the whole idea of the z flashing is to keep water out of the lower sheet if you caulk there any water that gets thru wont be able to drain out
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Old 01-18-2009, 08:42 PM   #7
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T1-11 channel


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Originally Posted by strublesiding@optonline.n View Post
the whole idea of the z flashing is to keep water out of the lower sheet if you caulk there any water that gets thru wont be able to drain out
So does that mean I should run the felt over the z flashing, so it will drain out? Also, do you use a 1/4" gap? That seems rather large.
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Old 01-18-2009, 09:33 PM   #8
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T1-11 channel


yes and yes
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Old 01-18-2009, 09:37 PM   #9
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T1-11 channel


Yes, leave a 1/4" gap to prevent wicking. Make some 1/4 shims up so the reveal is the same and it won't look goofy. It's the right way to install.

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Old 01-19-2009, 08:56 PM   #10
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T1-11 channel


I noticed that the box stores only carry galvanized z flashing. The exposed lip is also only about 3/8". The old z flashing has an exposed lip of around 1". Is there a place I can buy aluminum z flashing? Do they still make z flashing with a larger bottom piece?
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Old 01-19-2009, 11:10 PM   #11
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you could ask a siding guy to bend you what ever you need

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