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Insulation - Southern Louisiana Jude Alexander 12-29-2007
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Posted by Jude Alexander on December 29, 2007, 1:41 pm
Any architects on this ng from southern Louisiana? Would like to discuss
insulation in walls vs. attic. I suggest a 30R for attic and only 11R for
walls (4"). There is a myth out there that walls need to be 6" to give
southern walls adequate insulation. Crock of grits! I bump into someone
who keeps this myth going every now and then (like now - client - who
happens to be an engineer who thinks he knows more than God).



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Posted by 3D Peruna on December 29, 2007, 2:19 pm
Jude Alexander wrote:
> Any architects on this ng from southern Louisiana? Would like to discuss
> insulation in walls vs. attic. I suggest a 30R for attic and only 11R for
> walls (4"). There is a myth out there that walls need to be 6" to give
> southern walls adequate insulation. Crock of grits! I bump into someone
> who keeps this myth going every now and then (like now - client - who
> happens to be an engineer who thinks he knows more than God).
>
>
>

First, go here: http://tinyurl.com/2hswkq. This site should settle any
engineer down pretty well. If it doesn't, then I can't help.


Posted by Jude Alexander on December 29, 2007, 5:46 pm

> Jude Alexander wrote:
>> Any architects on this ng from southern Louisiana? Would like to discuss
>> insulation in walls vs. attic. I suggest a 30R for attic and only 11R
>> for walls (4"). There is a myth out there that walls need to be 6" to
>> give southern walls adequate insulation. Crock of grits! I bump into
>> someone who keeps this myth going every now and then (like now - client -
>> who happens to be an engineer who thinks he knows more than God).
>
> First, go here: http://tinyurl.com/2hswkq. This site should settle any
> engineer down pretty well. If it doesn't, then I can't help.

Thanks. The R values are close to what I suggest in my plans. Minimum R11
(I think I'll go up to the 13, however) in the wall and I'll stick with my
R30 vs. R20 in my attics. This gives me something to show the guy. :)



Posted by 3D Peruna on December 29, 2007, 8:23 pm
Jude Alexander wrote:

> Thanks. The R values are close to what I suggest in my plans. Minimum R11
> (I think I'll go up to the 13, however) in the wall and I'll stick with my
> R30 vs. R20 in my attics. This gives me something to show the guy. :)

The Building Science guys know their stuff. They've approached it all
from a physics standpoint - what really happens and how can you really
build it. 99% of the time, I do what they recommend. It's really hard
to go wrong with it...

Note that they recommend using rigid at the perimeter wall... Something
you don't see everyday, usually.


Posted by Jude Alexander on December 30, 2007, 9:07 am

> Jude Alexander wrote:
>
>> Thanks. The R values are close to what I suggest in my plans. Minimum
>> R11 (I think I'll go up to the 13, however) in the wall and I'll stick
>> with my R30 vs. R20 in my attics. This gives me something to show the
>> guy. :)
>
> The Building Science guys know their stuff. They've approached it all
> from a physics standpoint - what really happens and how can you really
> build it. 99% of the time, I do what they recommend. It's really hard to
> go wrong with it...
>
> Note that they recommend using rigid at the perimeter wall... Something
> you don't see everyday, usually.

That's true. Usually, people use the "pink stuff" (fiberglass).
>



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