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10-23-2009, 05:05 PM
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#1
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Registered User
Trade:
Handyman
Join Date: Feb 2007
Location: Massachusetts
Posts: 14
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Can foam be blown in through open soffits...
...to fill the rafter cavities?
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10-23-2009, 05:16 PM
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#2
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Framer
Trade:
framing/remodeling
Join Date: Feb 2005
Location: NE Ohio
Posts: 1,001
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can, yes, should????
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10-23-2009, 05:28 PM
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#3
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
Join Date: Apr 2006
Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
Posts: 10,151
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Quote:
Originally Posted by Maplehead
...to fill the rafter cavities?
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One usually want to keep rafter bays
open for ventilation purposes.....
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10-23-2009, 05:33 PM
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#4
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Registered User
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Handyman
Join Date: Feb 2007
Location: Massachusetts
Posts: 14
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Hi Warren
Thanks for the reply.
I'm in a dilemna. I was under the impression that the blown-in insulation job I was expecting done at my clients was to be foam, and the contractors told me they needed all construction completed before they came in to do their job. Well, they are cellulose insulators. They don't do roofs. This ceiling requires foam for code and I already have it plastered. My client has been calling around for a foam insulator and they are saying to her that they do it with the rafter channels open. Well, I sure as heck don't want to have to reopen them and then have the plasterers back. The rafter channels are about seven feet in length and they are all open at the bottom so I'm hoping that some foam contractor can do it via this way.
Any help is greatly appreciated.
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10-23-2009, 05:35 PM
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#5
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Registered User
Trade:
Handyman
Join Date: Feb 2007
Location: Massachusetts
Posts: 14
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Neolitic
In this case, where the rafters make up the ceiling framing to this new room, the specs are for foam throughout. Ventilation is not needed here.
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10-23-2009, 05:37 PM
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#6
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
Join Date: Apr 2006
Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
Posts: 10,151
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I'm sensing that you have
a cathedral ceiling here?
Don't make us guess too many
details, or we'll get bored.
ADD and all....
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10-23-2009, 05:40 PM
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#7
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
Join Date: Apr 2006
Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
Posts: 10,151
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I was still typing while you were posting.
Yes, you need a really competent foam
installer.
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10-23-2009, 05:44 PM
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#8
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Registered User
Trade:
Handyman
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Location: Massachusetts
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Correctly
I turned a three season porch off of a Cape house and in between the garage into a dining room.
I completely removed the front and back walls, rebuilt with 2 x 6's and sistered 2 x 10's to the existing 2 x 6 rafters. This all after I added two lvl's underneath the undersized ridge beam.
I haven't sided the two walls yet with clapboard and done all facia work so the rafter channels are open from the outside, as I figured this is how the foam is installed.
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10-23-2009, 05:46 PM
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#9
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Registered User
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Handyman
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Competent because this is a tricky way of doing it? Because the chance fior air pockets are now greater during install?
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10-23-2009, 06:06 PM
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#10
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
Join Date: Apr 2006
Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
Posts: 10,151
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Quote:
Originally Posted by Maplehead
Competent because this is a tricky way of doing it? Because the chance fior air pockets are now greater during install?
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Because the "normal" installation
would have been before you plastered.
They will have to really know
what they are doing to fill without
over filling.
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10-23-2009, 06:50 PM
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#11
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Framer
Trade:
framing/remodeling
Join Date: Feb 2005
Location: NE Ohio
Posts: 1,001
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How were they going to blow in cellulose on a cathedral ceiling?
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10-23-2009, 07:23 PM
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#12
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Butt Expert
Trade:
Drywall
Join Date: Sep 2008
Posts: 262
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I don't know how you'd get the cavity full even with cellulose from the soffit.
Looks like you'll need to call back the plasterer. 
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10-23-2009, 11:10 PM
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#13
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
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Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
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How long are the rafters?
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10-24-2009, 06:34 AM
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#14
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Registered User
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Handyman
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The rafters are about 7 feet long.
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10-24-2009, 09:51 AM
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#15
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Curmudgeon
Trade:
carpentry/remodeling/"Yes M'am we do"
Join Date: Apr 2006
Location: Beech Grove, Indiana, Birthplace of the "King of Cool"
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Sounds like it might be possible then,
but I wouldn't be wasting any time.
I'd be looking for an installer who thinks it is.
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10-24-2009, 05:45 PM
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#16
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Registered User
Trade:
Insulation / Custom Carpentry
Join Date: Sep 2009
Location: Northern MN
Posts: 9
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Quote:
Originally Posted by Maplehead
...to fill the rafter cavities?
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It can be done with Injection Foam. I do these all the time, its easy 
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