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Posted by ransley on July 22, 2009, 8:08 pm
On Jul 22, 8:02=A0am, "Robert.Thompson"
> > On Jul 20, 11:16=A0am, "Robert.Thompson"
> > > Hello:
> > > Is there any reason NOT to place 2 inch thick rigid foam insulation
> > > horizontally 2 feet wide, buried 12 inches deep, all around the
> > > perimeter of my 7 foot cement block foundation?
> > > 3 feet of the foundation is above grade and will be covered with rigi=
d
> > > foam insulation to a depth of 1 foot below grade. This will then be
> > > covered with some sort of protection like, say, stucco.
> > > Any thoughts on this would be appreciated.
> > > Rob.
> > I really dont understand what you are saying, do you want the 2"
> > laying flat not touching the foundation, if so it makes no sense, you
> > are not insulating anything. Your walls are 7ft right, but you plan on
> > only insulating 4 ft of it. What zone are you, what is freeze depth,
> > im zone 5, freeze to about 36" I put foamboard under the floor and
> > covered the whole foundation wall. If you are even in zone 7maybe 9,
> > id insulate =A0it all.
> I plan to insulate only 4 feet because I do not wish to dig down to
> the footings and this is why I am asking about laying 2" foam board,
> flat and butted to the wall insulation. This foam would be 2 feet wide
> and run around the entire house. I could bury it about 1 foot deep.
> On the inside, the top 4 feet is insulated with 1.5" foamboard glued
> to the concrete block. The bottom 3 feet is insulated with 2" foam
> board. The concrete floor "floats" on 2" foam board and butts up to
> the 2" foam on the lower portion of the wall - no contact with the
> concrete block.
> My concern is if there will be any negative consequences to installing
> a 2 foot 'wing' on insulation around the perimeter.
> I live in Montreal, Quebec, Canada. Footings here must be at least 4
> feet deep so I assume that the frost line is slightly above that.- Hide q=
uoted text -
> - Show quoted text -
Its not going to do any insulating unless its against the house,
foamboard goes from R 3- R 7' If you are using R5 the top is only
insulated to R7.5, thats not much in your area, R15-20 would make a
difference, I used R21-28, insulate by R value not inches of foam
there are alot of sites that give optimal needs.
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Posted by Wayne Whitney on July 22, 2009, 9:08 pm
> Its not going to do any insulating unless its against the house,
I believe that's not true. If you consider the path that heat takes
to get from a basement wall below grade to the cold air outside, in
elevation view it is roughly a semicircle from the basement wall to
grade. So if you interrupt that path any point with insulation,
you'll reduce the heat loss. This is also the reason that insulating
the upper part of the wall below grade is most important, as that is
the part of the wall with the least soil insulating it.
Cheers, Wayne
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Posted by ransley on July 23, 2009, 7:35 am
> > Its not going to do any insulating unless its against the house,
> I believe that's not true. =A0If you consider the path that heat takes
> to get from a basement wall below grade to the cold air outside, in
> elevation view it is roughly a semicircle from the basement wall to
> grade. =A0So if you interrupt that path any point with insulation,
> you'll reduce the heat loss. =A0This is also the reason that insulating
> the upper part of the wall below grade is most important, as that is
> the part of the wall with the least soil insulating it.
> Cheers, Wayne
The mass of dirt, energy it holds, and low R value of dirt makes this
idea sound very wrong, id bet anything multiple temp sensors buried
would prove this, unless someone can show some proven writings to this
theory
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Posted by RicodJour on July 23, 2009, 11:21 am
> > > Its not going to do any insulating unless its against the house,
> > I believe that's not true. =A0If you consider the path that heat takes
> > to get from a basement wall below grade to the cold air outside, in
> > elevation view it is roughly a semicircle from the basement wall to
> > grade. =A0So if you interrupt that path any point with insulation,
> > you'll reduce the heat loss. =A0This is also the reason that insulating
> > the upper part of the wall below grade is most important, as that is
> > the part of the wall with the least soil insulating it.
> > Cheers, Wayne
> The mass of dirt, energy it holds, and low R value of dirt makes this
> idea sound very wrong, id bet anything multiple temp sensors buried
> would prove this, unless someone can show some proven writings to this
> theory
There's heat coming from the center of the Earth, right? Once you get
down below a certain level the temperature stabilizes and what's
happening up above doesn't affect the soil temperature. Think of it
as holding the existing soil temperature in, and not the temperature
above out. Might make it clearer for you.
Check out the Building Science web site for cold climate construction
details.
R
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Posted by ransley on July 24, 2009, 7:10 am
> > > > Its not going to do any insulating unless its against the house,
> > > I believe that's not true. =A0If you consider the path that heat take=
s
> > > to get from a basement wall below grade to the cold air outside, in
> > > elevation view it is roughly a semicircle from the basement wall to
> > > grade. =A0So if you interrupt that path any point with insulation,
> > > you'll reduce the heat loss. =A0This is also the reason that insulati=
ng
> > > the upper part of the wall below grade is most important, as that is
> > > the part of the wall with the least soil insulating it.
> > > Cheers, Wayne
> > The mass of dirt, energy it holds, and low R value of dirt makes this
> > idea sound very wrong, id bet anything multiple temp sensors buried
> > would prove this, unless someone can show some proven writings to this
> > theory
> There's heat coming from the center of the Earth, right? =A0Once you get
> down below a certain level the temperature stabilizes and what's
> happening up above doesn't affect the soil temperature. =A0Think of it
> as holding the existing soil temperature in, and not the temperature
> above out. =A0Might make it clearer for you.
> Check out the Building Science web site for cold climate construction
> details.
> R- Hide quoted text -
> - Show quoted text -
Right, I went to the earths center, it was hot as hell, it melted my
timex. If I get this right even you think a wing, a piece of
horizontal insulation buried without 98% of the insulation touching
the sctructure will affect the colds transfer to the building and
reduce it? I say its a nuts idea. The low R and energy holding quality
of mass earth will simply bypass-go around the foam, I bet a temp
sensor above and below the wing will be equal. I say alot of work, no
effect. Now if the wing went out 25 feet it might help but never
payback, im in chicago area and below grade basements are still 65f,
they were 64f at -20f this winter.
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Page 2 of 3 < 1 2 3 > last >>
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