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Posted by on January 22, 2008, 1:31 pm
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> > On Jan 21, 1:40=EF=BF=BDpm, froggy_loves_hedd...@yahoo.com wrote:
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> > > Hi, I plan on having a new home built this year. =EF=BF=BDI am going t=
o do
> > > some of the work myself and have a few questions. =EF=BF=BDIt is going=
to be a
> > > small, 1400 SF, home and I hope to make it VERY energy efficient.
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> > > I am going to use spray foam insulation in the walls and ceiling.
> > > I've read of the unvented, semiconditioned method of doing an attic,
> > > but I am leaning towards foaming the attic floor and adding blown in
> > > on top. =EF=BF=BDThe roof will be galvanised metal over foil faced dec=
king. =EF=BF=BDI
> > > feel it is wasteful to allow the heat in my home to go up through an
> > > uninsulated ceiling to semicondition the attic during the winter. =EF=
=BF=BDThe
> > > galvanised metal or radiant barrier decking should keep a lot of heat
> > > from entering the attic in the summers. =EF=BF=BDAny reason why I shou=
ld
> > > consider the other method?
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> > > I'm going to apply 1 inch of foam in the walls and batts over that. =
=EF=BF=BDI
> > > know I dont need a vapor barrier, but what about a radiant barrier on
> > > the under the drywall on the walls and ceiling? =EF=BF=BDI feel that w=
ould
> > > make it very cozy in the winter. Would another layer of radiant
> > > barrier under the outer siding help even more?
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> > > Any ideas, suggestions =EF=BF=BDor other help is appreciated.
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> > closed cell foam is over R6 per inch, thats way better than any batt
> > material.
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> > true its upfront cost is more but it will reward you with a lifetime
> > on energy savings. plus foam seals all the little airleaks making for
> > a more energy efficent and quieter home, as air leaks conduct noise.
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> > Go with a foot of foam for R 72 walls and R100 cielings. since your
> > building theres a HVAC program that can show furnace BTUs needed,
> > heating cost per year, as the insulation is upgraded.- Hide quoted text =
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> > - Show quoted text -
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> 1400sq ft R 72 walls, R 100 ceiling might need 30,- 40,000 btu or with
> a good design with the sun.- Hide quoted text -
>
> - Show quoted text -
I'm in Texas near Dallas, so I think the R72 walls and R100 ceiling
are overkill. My main question was foam the roof versus foam the
attic floor. And the radiant barrier on the underside of the ceiling
and under the drywall on the walls.
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