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Old 09-25-2011, 09:09 AM   #1
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Top course of vinyl siding


Hi everyone,

My top course of siding is coming out to be about a 5 inch piece of siding....roughly one inch above the 2nd lap (4 inch double lap siding). I am using J trim with undersill trim inside of that. When I pop the tabs into the piece and try to fit it into position it doesn't go into the undersill trim because the lap in the siding. Is it possible to just use the J trim since the undersill isn't working? There is a lip for the tab in the siding to go into on the J trim, but I don't know how to get it to lock b/c the width of the j trim makes a void behind the siding. If anyone has any suggestions I am more than up for some experimenting as I've tried a couple of different things and none have worked so far. Also I have attached a drawing just in case my explanation wasn't that great. Thanks in advance for any help!
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Old 09-25-2011, 09:30 AM   #2
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Top course of vinyl siding


ask your supplier for dual undersill trim

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Old 09-25-2011, 09:56 AM   #3
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Top course of vinyl siding


The way you show it on your drawing -
the undersill (finish trim) is reversed, from what it should be.
The nailing flange (long side) of the undersill trim should be behind the
outside face of the siding.
Got a "snap-lock" punch?
What's the "profile" of the siding - Double-4, Dutch Lap ...

rossfingal
(However, maybe I'm interpreting your drawing incorrectly!)
OOPS!! Just reread your post - ME BAD!
Dutch Lap - follow "Tom Struble"s advice - Double "UT" trim!

Last edited by rossfingal; 09-25-2011 at 10:13 AM.
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Old 09-25-2011, 08:21 PM   #4
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Top course of vinyl siding


is the soffit already up, i know a few siding installers that will run the siding up past first if they know they'll end up with a odd dimension. then they put f channel on top of the siding to recieve the soffit. if that doesnt work you could make a freize board which will make your cut 1" smaller. this way you can cut the siding right in the inside bend on the face. run your j channel under the freize board and tuck it into the p-channel. use a snap lock punch in conjuction with running a thin bead of clear silicone on the lock of the closing peice
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Old 09-25-2011, 09:17 PM   #5
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Top course of vinyl siding


I talked to the building supply store where I bought the siding and they said to run the siding into the j trim, slightly bend the j trim up and put a colored finish nail at the very top to hold the piece in. To me that doesn't seem right because all of the installation guides say to never nail directly in the siding. The guy at the store said it wouldn't be a problem because it won't see the heat/sun exposure like a piece towards the middle of your wall. Has anyone heard of this type of solution? The guy said its a pretty common practice for installers to do.
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Old 09-26-2011, 09:41 AM   #6
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Top course of vinyl siding


Quote:
Originally Posted by mnsider View Post
put a colored finish nail at the very top to hold the piece in
Yep, that's what I've done. Usually its at a peak where there is nothing to hold the point snug in place I'll put 1 in.
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Old 09-26-2011, 09:44 AM   #7
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Face nailing through the siding can be done -
Not really advisable - unless you know exactly what you're doing.
Vinyl siding - even if not directly, exposed to the Sun - it does
expand and contract - a lot!
(Over the years - repaired a bunch of vinyl siding, because of
incorrectly done face-nailing!)
The "Rule of Thumb" is - predrill the siding with a hole 3 to 4 times the diameter of the fastener (nail or screw).

RF
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Old 09-26-2011, 10:02 AM   #8
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Top course of vinyl siding


Would you use a finish nail or just a regular siding nail? I would assume if you pre-drill the hole 3-4 times larger than the nail then a finish nail wouldn't work b/c the nail head is so small....right?
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Old 09-26-2011, 10:12 AM   #9
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Top course of vinyl siding


Finish course in a gable -
Finish trim (UT, undersill ...)
Snap-lock punch - "Solar-Seal" - "Quad" ...
No face nails.
(I admit it - I've done the face nailing!)
Sorry!

RF

"mnsider"
If a trim nail isn't long enough -
we would use an aluminum siding nail - 1 1/2" to 2" (stainless-steel works, also)
If the caulk we have is good - we might even smear the head of the nail -
to match the siding.
(It's different now - then when, all you were dealing with was "Straight-8" aluminum
or vinyl)
Also, we might put the nail in the "break" on the siding - Double-4, Double-5 ...
It's hidden in a shadow.
It's worked for 35 years - so far.
Very few people stare up at your soffits/overhangs - they usually look at the total
"package" - "curb-appeal" - "looks" ...
You might notice it's there (it's yours) - I might notice (I'm payed to do that) - most people wouldn't.

Last edited by rossfingal; 09-26-2011 at 10:42 AM.
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Old 09-26-2011, 03:42 PM   #10
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if i do take the "finish nail" route i will use a cedar shingle nail, similar in size to a finish nail but has a head larger than a actual finish nail but still 1/4 the size of a roofing nail
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Old 09-26-2011, 04:31 PM   #11
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Top course of vinyl siding


Mn,
Why don't you just use the dual undersill trim that Tom mentioned? That's what it's for. If the supplier you went to doesn't offer it, go to another supplier, it's not that hard to find.
Mike Hawkins
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Old 09-26-2011, 04:39 PM   #12
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Top course of vinyl siding


I would use the dual undersill trim....BUT I've already trimmed out half the house. We started on the project this weekend...put up all the trim on the front side of the house and then ran into this problem when we hit the top. So instead of eating about $200 in j-trim/undersill trim...I would rather just use what I have.
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Old 09-26-2011, 04:59 PM   #13
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you can return the stuff you already bought or exchange it for the dual undersil or have you cut the peices already. if you bought your trim at a big box you will have to return it then go to a siding supplier
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Old 09-27-2011, 06:19 AM   #14
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Top course of vinyl siding


you can ''pack out'' the j so the top of the panel is closer to the outside lip of the j

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