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Posted by Craig M on October 26, 2008, 12:51 pm
Dont know where the house is, but here in Texas, South East Texas, I dont go
hog wild with the foam, house and the attic needs to breath, if you seal one
up that tight, think of a fresh air return added to your HVAC system, to
positive presure the house, and get some fresh outside air in there, cause
we dont live in our refridgetors, we keep food in them. but to seal up so
tight is not the best way to go, when I say not best way, I am talking
healthy way as well.
> I'm to the point that I have to insulate on top and close the gables.
> I'm getting conflicting sides on where to insulate [ on top of ceiling
> or under roof deck]
> Wheather or not to vent the attic.
> There will be no duct work up there. It will be closed off.
> This is a ICF house.
> I was thinking of having spray foam applied to the top of the ceiling
> sheet rock thus sealing the living space completely like a igloo
> cooler.
> HAve been reading about not venting the attic area but am concerned
> with condensation. Metal roof installed.
> I have not covered the gables yet so gable vents will not be a
> problem.
> So the questions are
> 1] where do I insulate?
> 2] vent or no vent
> I hope to get back up the middle of this month. Will take me about
> 5-10 days work then I can get living in this baby!
>
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Posted by DouginUtah on October 26, 2008, 7:00 pm
FYI, I happen to know the house is in Tennessee.
> Dont know where the house is, but here in Texas, South East Texas, I dont
> go hog wild with the foam, house and the attic needs to breath, if you
> seal one up that tight, think of a fresh air return added to your HVAC
> system, to positive presure the house, and get some fresh outside air in
> there, cause we dont live in our refridgetors, we keep food in them. but
> to seal up so tight is not the best way to go, when I say not best way, I
> am talking healthy way as well.
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Posted by Raider Bill on October 28, 2008, 10:00 am
> FYI, I happen to know the house is in Tennessee.
> > Dont know where the house is, but here in Texas, South East Texas, I do=
nt
> > go hog wild with the foam, house and the attic needs to breath, if you
> > seal one up that tight, think of a fresh air return added to your HVAC
> > system, to positive presure the house, and get some fresh outside air i=
n
> > there, cause we dont live in our refridgetors, we keep food in them. bu=
t
> > to seal up so tight is not the best way to go, when I say not best way,=
I
> > am talking healthy way as well.
ed text -
> - Show quoted text -
Doug is right Athens. tenn.Good memory!
Sorry I posted and ran I'm back up here and internet and cell is very
spotty at best.
I'm freezing my butt off. Icf sure is a great insulater as it has
retained all the cold.
I like the idea of foaming the ceiling then blowing in some cellouse
on tp.
But what about condensation in the summer from the the metal roof?
To vent or not to vent....... that is the question?
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Posted by PeterD on October 28, 2008, 12:11 pm
On Tue, 28 Oct 2008 07:00:19 -0700 (PDT), Raider Bill
>> FYI, I happen to know the house is in Tennessee.
>> > Dont know where the house is, but here in Texas, South East Texas, I dont
>> > go hog wild with the foam, house and the attic needs to breath, if you
>> > seal one up that tight, think of a fresh air return added to your HVAC
>> > system, to positive presure the house, and get some fresh outside air in
>> > there, cause we dont live in our refridgetors, we keep food in them. but
>> > to seal up so tight is not the best way to go, when I say not best way, I
>> > am talking healthy way as well.
text -
>> - Show quoted text -
>Doug is right Athens. tenn.Good memory!
>Sorry I posted and ran I'm back up here and internet and cell is very
>spotty at best.
>I'm freezing my butt off. Icf sure is a great insulater as it has
>retained all the cold.
>I like the idea of foaming the ceiling then blowing in some cellouse
>on tp.
>But what about condensation in the summer from the the metal roof?
>To vent or not to vent....... that is the question?
That question was answered by almost everyone-- you *must* vent.
Period, not two ways about it.
Now, why do you feel you need foam? Why not just cellouse?
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Posted by Astro on October 29, 2008, 10:51 am
> On Tue, 28 Oct 2008 07:00:19 -0700 (PDT), Raider Bill
> >> FYI, I happen to know the house is in Tennessee.
> >> > Dont know where the house is, but here in Texas, South East Texas, I=
dont
> >> > go hog wild with the foam, house and the attic needs to breath, if y=
ou
> >> > seal one up that tight, think of a fresh air return added to your HV=
AC
> >> > system, to positive presure the house, and get some fresh outside ai=
r in
> >> > there, cause we dont live in our refridgetors, we keep food in them.=
but
> >> > to seal up so tight is not the best way to go, when I say not best w=
ay, I
> >> > am talking healthy way as well.
uoted text -
> >> - Show quoted text -
> >Doug is right Athens. =A0tenn.Good memory!
> >Sorry I posted and ran =A0I'm back up here and internet and cell is very
> >spotty at best.
> >I'm freezing my butt off. Icf sure is a great insulater as it has
> >retained all the cold.
> >I like the idea of foaming the ceiling then blowing in some cellouse
> >on tp.
> >But what about condensation in the summer from the the metal roof?
> >To vent or not to vent....... that is the question?
> That question was answered by almost everyone-- you *must* vent.
> Period, not two ways about it.
> Now, why do you feel you need foam? Why not just cellouse?
Loose fill cellulose does nothing to stop air/moisture movement from
the living space up to the attic - the primary source of problems with
winter moisture buildup in attics. 2-3" of high density spray foam
seals everything up, greatly, greatly reducing the opportunity for
moisture to get into the attic and drastically reduce the chance for
any moisture damage up there during the winter.
During the summer, the moisture drive is from the outside air. The
metal roof cools rapidly and condensation forms under it if there is
any moisture between the metal roof and the underlying sheathing so
there must be a moisture impervious layer between the metal roof and
the sheathing as well as room for ventilation between the metal and
the sheathing to avoid moisture entrapment.
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> I'm getting conflicting sides on where to insulate [ on top of ceiling
> or under roof deck]
> Wheather or not to vent the attic.
> There will be no duct work up there. It will be closed off.
> This is a ICF house.
> I was thinking of having spray foam applied to the top of the ceiling
> sheet rock thus sealing the living space completely like a igloo
> cooler.
> HAve been reading about not venting the attic area but am concerned
> with condensation. Metal roof installed.
> I have not covered the gables yet so gable vents will not be a
> problem.
> So the questions are
> 1] where do I insulate?
> 2] vent or no vent
> I hope to get back up the middle of this month. Will take me about
> 5-10 days work then I can get living in this baby!
>