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10-27-2009, 10:42 PM
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#1
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Newbie
Join Date: Jun 2009
Posts: 28
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t&g
finishing up a new house and im going to install a tounge and groove ceiling. i debating weather to sheat the ceiling first with 7/16 osb or nail it directly to the rafters. the raftes are 24" ocand its cathedral ceiling. any opinions are greatly appreciated, thanks !!!!
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10-27-2009, 11:09 PM
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#2
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Member
Join Date: Jan 2009
Posts: 400
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You'll be okay nailing it directly to the ceiling. The osb would not serve any purpose. If the rafter's don't plane out well you may have to shim a little.
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10-27-2009, 11:17 PM
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#3
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Newbie
Join Date: Jun 2009
Posts: 28
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i was kinda hopig for this answer, but i just want to do right the first time and not wonder if i shouda did it another way. iv also heard people say not to wory about landing butt joints on a rafter becaus the boards above it and below it will hold the jont , any opinions ?
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10-28-2009, 08:24 AM
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#4
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Member
Join Date: Jan 2009
Posts: 400
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Always land butt joints on solid framing. It helps keeps the joint tight.
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10-28-2009, 09:42 PM
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#5
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Remodeling Contractor
Join Date: Oct 2009
Location: Minneapolis, MN
Posts: 22
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Quote:
Originally Posted by jaros bros.
Always land butt joints on solid framing. It helps keeps the joint tight.
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Unless the ends are t+g also, then no need.
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10-28-2009, 10:28 PM
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#6
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Member
Join Date: Mar 2009
Posts: 1,608
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I'd be concerned my conditioned air leaked through every crack on every board without an air barrier. Contributing to water in the batt glass insulation going to to ridge vent, depositing on the framing and /or kraft paper facing causing mold and rot. Possibly causing the joints to swell and shrink with the heating/cooling. Unless you had spray foam hot roof, even then....
Be safe, Gary
__________________
If you have a clothes dryer in an interior room, please check the exhaust ducting for lint build-up!
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10-28-2009, 10:49 PM
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#7
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Newbie
Join Date: Jun 2009
Posts: 28
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gbr, so your saying that even with faced insulation id still need a secondary vapor barrier, ie; the osb. i dont have a problem sheeting it i just want to make sure its neccesary. please fill me with info, anybody!
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10-28-2009, 10:51 PM
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#8
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Newbie
Join Date: Jun 2009
Posts: 28
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what about using polly under the t&g
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10-28-2009, 11:21 PM
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#9
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Newbie
Join Date: Jun 2009
Posts: 28
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also the cathedral ceiligs are scissor trusses with faced r38, vented soffit anad a ridge vent the entire length of the roof.
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10-29-2009, 12:45 AM
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#10
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Member
Join Date: Oct 2009
Location: Wisconsin
Posts: 49
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No need for osb sheathing, but a vapor barrier is needed. Kraft Faced insulation does tend to get caught in the grooves, but it can be done. I prefer poly (visqueen) for ease of installation.
Narrow boards or end matched boards are fine to install without landing on the joists or rafters.
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10-29-2009, 03:28 PM
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#11
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Member
Join Date: Mar 2009
Posts: 1,608
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Very cold climate, poly sheeting, all others except gulf, house wraps next to warm side: http://www.buildingscience.com/docum...on?full_view=1
Be safe, Gary
__________________
If you have a clothes dryer in an interior room, please check the exhaust ducting for lint build-up!
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10-29-2009, 06:22 PM
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#12
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Member
Join Date: Mar 2007
Location: Long Island, NY
Posts: 2,898
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Quote:
Originally Posted by roadhouse
finishing up a new house and im going to install a tounge and groove ceiling. i debating weather to sheat the ceiling first with 7/16 osb or nail it directly to the rafters. the raftes are 24" ocand its cathedral ceiling. any opinions are greatly appreciated, thanks !!!!
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What is the thickness of the material you're putting up? I wouldn't put up thin material on a 24" span.
Ron
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10-29-2009, 11:24 PM
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#13
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Newbie
Join Date: Jun 2009
Posts: 28
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the thickness of the material.3/4". i think it should be thick enough for a 24" span.
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10-30-2009, 11:06 AM
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#14
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Member
Join Date: Mar 2007
Location: Long Island, NY
Posts: 2,898
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Quote:
Originally Posted by roadhouse
the thickness of the material.3/4". i think it should be thick enough for a 24" span.
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Just make sure the vapor barrier is in place and the moisture content of the wood is appropriate.
I would seal the backs of this wood to eliminate moisture absorption.
Ron
Last edited by Ron6519; 10-30-2009 at 11:09 AM.
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10-31-2009, 09:08 PM
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#15
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Newbie
Join Date: Oct 2009
Location: Canada
Posts: 1
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T&G Ceiling
I'm installing T&G pine panelling on basement ceiling...do I install the first panel with the T or G out? Do I nail in the T or G?
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