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Vinyl soffit span... what backing OC? Vinyl soffit span... what backing OC?
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Old 10-06-2008, 02:50 PM   #1
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Vinyl soffit span... what backing OC?
Hi everyone. Im curious what others fasten their soffit backing at. Im installing soffit under a deck (about 7 feet span), and I am wondering what common practice is for installation of backing. Currently I am running my plywood rainscreen strips at about 30" OC for 8" wide soffit panels (D4 soffit).

Common practice I have found is to not span your soffits more than 3 feet without backing, therefore 30" OC should be acceptable.

I already know that the Vinyl Siding Institute reccomends not spanning your soffits more than 16" without backing, however Im curious as to what industry standards are in other places.

Im in Vancouver BC.

Your help is greatly appreciated!

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Old 10-06-2008, 03:41 PM   #2
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Old 10-07-2008, 03:32 PM   #3
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ever seen "wedding crashers"?
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Old 10-07-2008, 03:48 PM   #4
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I never go over 16".
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Old 10-07-2008, 04:01 PM   #5
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are you using 8" wide panels (D4) or 16" wide panels (4 panel)??
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Old 10-07-2008, 04:19 PM   #6
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So how much money do you feel you're saving by doing less than what the manufacturer suggests? Is their a reason you don't follow directions?
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Old 10-07-2008, 07:41 PM   #7
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16 or less and if its more than 3 feet, it better be beaded
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Old 10-08-2008, 05:46 PM   #8
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Who installs the backing for the soffits... the siding contractor or the framer?

Our standards in Vancouver has been the framer for most parts although the last few years they get "too busy" and we are forced to "throw it in".
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Old 10-08-2008, 05:53 PM   #9
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Depends on crew and builder.
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Old 10-09-2008, 12:42 PM   #10
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I have just found literature for manufacturers reccomendations is not to span 8" soffit more than 48".
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Old 10-09-2008, 09:05 PM   #11
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The vinyl soffit spans between nailers depend on thickness of the material and tinsel strength. Economy and most triple 4 universal soffit should be nailed at 12`` oc while d-5 can span 24``. Certainteed Iron Max can span 36``. 3/8 cdx is not considered a nailer. No vinyl soffit can span 4 ft.

Alcoa Aluminum soffit can span 4 ft. Steel soffit can span 5 ft.
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Old 12-24-2008, 12:41 AM   #12
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4'? i dont know im a 16''oc beliver and if the framers dont add blocking i do
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