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Old 07-17-2012, 03:59 PM   #1
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Ten ft span of J-channel - should I splice it?


About to start installing beaded vinyl soffit on porch ceiling. There is a 10' span along the sides of the porch.

To allow for expansion/contraction of the J-channel, and also have nice looking corners, would it be better to splice it into two 5' pieces and force possible movement at the join instead of at the corners?

Or am I worrying too much?

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Last edited by NancyNGA; 07-18-2012 at 12:56 AM. Reason: typo
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Old 07-17-2012, 04:04 PM   #2
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Ten ft span of J-channel - should I splice it?


Since it comes 12'6" why would you cut it? Trim does not move like the siding does.
Siding trim can get nailed tight, it's the siding or beaded that is hung not nailed tight.

May want to concider using 1/2 J not 5/8" it that's what you have.

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Old 07-17-2012, 04:35 PM   #3
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Ten ft span of J-channel - should I splice it?


Thanks, Joe. I just thought the J-channel moved a lot, too. Sure didn't want to splice it if it wasn't necessary.

Actually it's only 3/8" channel, made for the narrow 6" wide soffit with three 2" slats. (Certainteed).
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Old 07-17-2012, 05:10 PM   #4
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Ten ft span of J-channel - should I splice it?


That J needs to be 1/2, I've never seen or heard of 3/8". The panels need to be able to move inside the J, if not it's going to buckle. Check it out, it should be slightly loose.
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Old 07-17-2012, 05:55 PM   #5
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Ten ft span of J-channel - should I splice it?


This is the only picture I could find. They make J-channel specifically for it. And I checked it out---the panels do move in there. Thanks!

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Old 07-17-2012, 07:29 PM   #6
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Ten ft span of J-channel - should I splice it?


3/8'' is the proper j for that panel
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Old 07-18-2012, 12:43 AM   #7
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Ten ft span of J-channel - should I splice it?


the lady knows her vinyl carpentry
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Old 07-18-2012, 01:02 AM   #8
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Ten ft span of J-channel - should I splice it?


I almost never use J moulding with beaded soffit, I use vinyl cove moulding that's made by Certeenteed.
It looks like cove from below but it has a track in it for the beaded panels to slide into.
Looks far better.
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Old 07-18-2012, 07:44 AM   #9
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Ten ft span of J-channel - should I splice it?


plus you didn't know 3/8'' existed

that cove has a wider pocket then the panel is and the back of the panel needs to be shimmed for it to ''look much better''

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Old 07-18-2012, 08:41 AM   #10
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Ten ft span of J-channel - should I splice it?


Quote:
Originally Posted by Tom Struble View Post

that cove has a wider pocket then the panel is and the back of the panel needs to be shimmed for it to ''look much better''
Exactly!

I just really like their beaded 6" stuff so much better than anything else I could find, that I decided to compromise on the channels. Maybe a mistake. We'll see I guess...

ETA: That's why I don't want the shrinkage come January to show little black holes at the ends of the mitered corners. Think I'd rather see a seam in the channel in the center of the run. Still inclined to splice it.

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