Home Page link

r value of concrete

Home| Search | About
Login Password
Register Now! Lost Password?

Building Construction - Building Construction Industry Discussions. 

Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
r value of concrete M 10-27-2006
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by M on October 27, 2006, 7:46 pm
I had an argument with a friend. I told him that concrete has little or no
r value if it isn't backfilled. Does anyone have the rating of straight 8"
thick concrete?



Posted by Mike on October 27, 2006, 8:15 pm

>I had an argument with a friend. I told him that concrete has little or no
>r value if it isn't backfilled. Does anyone have the rating of straight 8"
>thick concrete?
ITs 0.08/r/inch



Posted by on October 28, 2006, 4:24 pm

Mike wrote:
> ITs 0.08/r/inch

Dang, is there any way to insulate that with a sealing coat or
insulating additive (to floor paint)?


Posted by M on October 29, 2006, 6:19 pm

>
> Mike wrote:
>> ITs 0.08/r/inch
>
> Dang, is there any way to insulate that with a sealing coat or
> insulating additive (to floor paint)?
>

before back filling some folks are putting foam up. You can also insulate
from the inside. Backfilling makes for great r value but it isn't a good
idea to back fill right up to the siding ....



Posted by Matt Whiting on October 29, 2006, 6:29 pm
M wrote:
>
>>Mike wrote:
>>
>>>ITs 0.08/r/inch
>>
>>Dang, is there any way to insulate that with a sealing coat or
>>insulating additive (to floor paint)?
>>
>
>
> before back filling some folks are putting foam up. You can also insulate
> from the inside. Backfilling makes for great r value but it isn't a good
> idea to back fill right up to the siding ....
>
>

It is a technical point I admit, but backfilling has no change to the
R-value of the wall. It changes the delta-T that the wall sees, but it
doesn't affect the resistance to heat transfer. If you are in a cold
climate where the earth freezes for 3-4' in the winter, then the top
half of the concrete wall will still lose a lot of heat. Adding foam
does increase the R-value of the wall and will help a lot if in a
location where the ground gets pretty cold in the winter ... or warm in
the summer.


Matt

Similar ThreadsPosted
Concrete driveway issue Any concrete experts? March 15, 2008, 9:48 am
Stamped concrete vs. concrete overlay? December 10, 2006, 11:47 pm
pouring concrete over concrete December 10, 2006, 5:34 pm
Etched concrete October 18, 2006, 11:49 am
concrete question October 30, 2006, 9:34 am
New concrete floor November 17, 2006, 4:08 pm
help with concrete problem pls November 20, 2006, 2:27 am
concrete cutting January 25, 2007, 7:22 am
ALL CONCRETE WORKDONE February 12, 2007, 2:30 pm
Need some advice on Concrete June 17, 2007, 12:23 pm

Contact Us | Privacy Policy

XML SitemapXML Sitemap