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Posted by Robert.Thompson on July 20, 2009, 12:16 pm
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 rigid
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.
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Posted by Roarmeister on July 20, 2009, 12:56 pm
On Mon, 20 Jul 2009 09:16:59 -0700 (PDT), "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 rigid
>foam insulation to a depth of 1 foot below grade. This will then be
>covered with some sort of protection like, say, stucco.
If you use a closed cell foam insulation, you're OK. If you are using
an open cell foam - all you are really going to do is soak up moisture
and hold it next to the concrete block. (P.S. Concrete block not
cement block - Portland cement is a relatively small part of the
material it's made of - just a pet peeve of mine...)
Depending on where you live the practise of insulating from the
exterior can be done best by either extending the insulation down to
below the frost level or by going down either 2' or 4' and then out 4'
so that any heat transferred from the interior doesn't transfer to the
surface soil.
The stucco wire will need to be fastened to something - use a wood
nailer at the top and bottom. You want to use parging rather than
stucco at grade level.
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Posted by ransley on July 20, 2009, 9:53 pm
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 rigid
> 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 it all.
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Posted by Robert.Thompson on July 22, 2009, 9:02 am
> 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 rigid
> > 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.
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Posted by RicodJour on July 22, 2009, 12:10 pm
On Jul 22, 9:02=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.
Termites and other problem insects like to tunnel in foam. I don't
know how big of a problem termites are in your neck of the woods, but
you should investigate that aspect.
Here's a link to an EPS EIFs termite page to get you started:
http://www.toolbase.org/Design-Construction-Guides/Foundations/termite-prot=
ection-eifs
R
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>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 rigid
>foam insulation to a depth of 1 foot below grade. This will then be
>covered with some sort of protection like, say, stucco.