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Foam Backed Vinyl Siding

 
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Old 01-27-2016, 10:42 AM   #1
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Foam Backed Vinyl Siding


My vinyl siding with foam thickness will be 1 1/4"., Would it be better to shim the 3/4" J channel with 1/2" foam or use a 1 1/4" J Channel and slide the whole thing in.
I'm thinking using the 1 1/4" the foam against the inside of the channel will help cause wicking of water towards the inside.

All corners, top, window/ door sides. Has anyone done it both ways to say which way might be better.
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Old 01-27-2016, 02:56 PM   #2
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Re: Foam Backed Vinyl Siding


..the only reason i would use 3/4'' pocket would be because i couldn't find the 1 1/4'',i guess i'm not following this wicking problem

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Old 01-27-2016, 03:34 PM   #3
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Re: Foam Backed Vinyl Siding


I was just getting ready to clarify.
Perhaps not so much wicking ( wrong way to phrase) but more of using the foam to draw the water in. Kind of like not clipping the corners on a asphalt shingle valley. But I think more like the small space between the siding itself and the foam creating a suction if you will?

As far as the J channel I was going to make it.

Probably go with a 3/4" channel. Thanks Tom.

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Old 01-27-2016, 03:35 PM   #4
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Re: Foam Backed Vinyl Siding


but it will deadend at the back of the j..i see no issue with that
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Old 01-27-2016, 05:35 PM   #5
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Re: Foam Backed Vinyl Siding


Is the 1 1/4 the thickeness when lapped? Personally I would use the channel that is recommended for that situation. I know with steel siding I use 1 1/8 J when I use a drop in backer and it comes close to filling the channel . I have made J before , but would rather not when using it around openings. Little harder to wrap the corners the way I do it. But then again vinyl is done different so not sure that would work out.
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Old 01-28-2016, 07:12 AM   #6
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Re: Foam Backed Vinyl Siding


The 1 1/4 is the overall thickness of the siding with foam. I think I'm going to go with the 3/4 and I ll tell you why.
I do believe if the foam and siding fit into the J it would draw water in. How far I don't know, perhaps to the end of the J, perhaps not. Would depend on what point in the siding/ foam it was drawing water from.

At times I install metal shingle/ shake roofing products that utilize a 'fitted foam in areas of roof traffic, such as along the sidewalls.
The sidewall channel is a more like a F channel with a hem on the roof side used a water channel. I do not extend the foam into the channel or even on the flashing itself. Water would hit the foam and carry in past the hem.
Siding would be similar, but not as prone to the drawing in.

Don't do much siding so never had to think about it before.
In an effort to keep the look uniform I'm making all the corners , door/ window lineals, gable and soffit frieze from PVC coated aluminum.

Thanks guys for your input.

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Old 01-28-2016, 07:15 AM   #7
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Re: Foam Backed Vinyl Siding


oh..i get your point now
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Old 01-28-2016, 07:51 AM   #8
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Re: Foam Backed Vinyl Siding


who's panel are you using?
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Old 01-28-2016, 07:53 AM   #9
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Re: Foam Backed Vinyl Siding


You are talking about capillary action, correct or are you worried about surface tension?

Personally I would be more worried about the field. It shouldn't draw water in from the ground up as you should have a gap there, the bulk of the water hitting the siding is going to drain straight off. 1% will not (on average) which will not be focused only at corners, etc... but the whole field where it can be trapped (depending on the vinyl / foam system - some have channels to drain water away). This can be wicked up, but mostly it will try moving into the structure or back out.

If you are really concerned I would add a 1/4" drainage plane all the way around & use the J, etc... designed for that siding. Using the proper J allows for draining, expansion & contraction. As for how far can surface tension pull the water around the corners & under - it all depends but most drains out fine under normal circumstances & that is why we have WRB's & proper flashing for what might get past.
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Old 01-28-2016, 08:02 AM   #10
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Re: Foam Backed Vinyl Siding


Crane's panel uses a contour on the back that they claim helps
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Old 01-28-2016, 08:26 AM   #11
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Re: Foam Backed Vinyl Siding


The crane panel wouldn't fit in a 3/4" J without pushing the J out.
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Old 01-28-2016, 08:40 AM   #12
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by Tom Struble View Post
who's panel are you using?
Revere Sovereign select D4 Clapboard with 'Full Back' foam


Quote:
You are talking about capillary action, correct or are you worried about surface tension?
When I started this off I was thinking of the corners and any vertical abutment which would utilize a type of J flashing.


Quote:
The crane panel wouldn't fit in a 3/4" J without pushing the J out.
The Revere would also if one didn't shim a 1/2" behind the 3/4" J

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Old 01-28-2016, 09:14 AM   #13
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by BamBamm5144 View Post
The crane panel wouldn't fit in a 3/4" J without pushing the J out.
That would be my concern too, not a nice look when it does that.
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Old 02-01-2016, 06:29 AM   #14
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Re: Foam Backed Vinyl Siding


I may end up needing to put an additional 1/2" R3 foam board up for added insulation. Do you guys think I should put it over the new house wrap or behind?
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Old 02-01-2016, 08:01 AM   #15
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by red_cedar View Post
I may end up needing to put an additional 1/2" R3 foam board up for added insulation. Do you guys think I should put it over the new house wrap or behind?
If you do that you will need to use furring strips to right.
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Old 02-01-2016, 08:20 AM   #16
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Re: Foam Backed Vinyl Siding


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If you do that you will need to use furring strips to right.
Why?
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Old 02-01-2016, 08:24 AM   #17
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by red_cedar View Post
I may end up needing to put an additional 1/2" R3 foam board up for added insulation. Do you guys think I should put it over the new house wrap or behind?
It depends really on how you flash your windows - for more:
http://thehtrc.com/2013/common-sense...istive-barrier (about 1/3 of the way down)

Not sure what Randy is getting at, unless he is calling out for the rain screed detail. The other item is check with the manufacturer for how they would prefer it to be done
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Old 02-01-2016, 09:39 AM   #18
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by SLSTech View Post
It depends really on how you flash your windows - for more:
http://thehtrc.com/2013/common-sense...istive-barrier (about 1/3 of the way down)

Not sure what Randy is getting at, unless he is calling out for the rain screed detail. The other item is check with the manufacturer for how they would prefer it to be done
If adding 1/2 foam and the siding is 1 1/4 or more with its foam ,that is hanging a long ways out on a nail is all.

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Old 02-01-2016, 10:21 AM   #19
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Re: Foam Backed Vinyl Siding


Quote:
Originally Posted by Randy Bush View Post
If adding 1/2 foam and the siding is 1 1/4 or more with its foam ,that is hanging a long ways out on a nail is all.

Sent from my LG-V410 using Tapatalk
I see what you mean about thickness.
I'm pretty sure the 1 1/4" thickness is measured at 'butt' thickness and not the nailing flange where it is about 1/2 inch.

So if I added another 1/2" my nail-able thickness is apx. 1" + the 1/2" thats already there.

I'm pretty sure I should try to increase the exteriors R rating. Last time will need to be done in my lifetime, hopefully

Good point though.

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Old 02-01-2016, 01:55 PM   #20
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Re: Foam Backed Vinyl Siding


there is not even 1/2'' of foam at the flange,nail length is no issue there
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