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basement insulation

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Posted by darrylvan on November 22, 2006, 2:17 am
 
Before actually undertaking any 'solar' thermal projects I thought it
might be wise to go about insulating my basement.

The walls are a no-brainer but i am debating insulating the floor. From
all the research I've done so far it appears that there is very little
energy savings (even in my 10,000 degree day climate) per say rather the
upside is it feels warmer on the feet.

Any comments?

Posted by Steve Shantz on November 23, 2006, 1:33 am
 

darrylvan wrote:

Darryl,

You are asking the right questions, but you have left a lot out.  What
are your plans?  DHW, or heating your house?  If heating your house,
how do you plan to to this?  Hydronic heat in the floor is a great
application for solar, and would require an insulated floor if you want
to heat your basement.

Steve


Posted by darrylvan on November 23, 2006, 4:38 am
 Steve Shantz wrote:

Good questions. I plan on solar (air) heating to start at some point. My
current heating system is forced air electric furnace.

-Darryl

Posted by thecase on November 23, 2006, 3:13 pm
 I have a walkout basement at my cottage in a 9000 DD climate that was
uninsulated.  Obviously I insulated the walls, but like you was
uncertain about the floor.  I ended up using a product called "DRicore"
which consists of 2'x2', 5/8" tongue & grooved OSB plywood panels
backed with some supper tough plastic formed into 1/4" high dimples.
The dimple side goes down while the wood decking becomes the sub floor.
Carpeting was placed on top of this.

I am very happy with the results. The insulation factor is small, but
the comfort on the feet (it's a bedroom) is wonderful.  The small size
of the individual panels means that:

1) one person can do all the installation alone.
2) Trimming for doors/posts etc. is much easier as one isn't wrestling
a 4'x8' sheet.
3) one can fit 100 panels into a normal car.
4) installation is very fast, (grab a panel, and tap it in)
5) only 1 1/4" of headroom is lost:

Sure you pay a bit extra ($.00/ a 2'x2' panel) over what one could do
with just 4'x8' plywood and "Waffle" plastic, but I highly recommend
this product.  I got mine at Menards/ but HD has it too.

Here's a link:

http://www.dricore.com/en/eindex.htm

Good luck!


Posted by Astro on November 23, 2006, 3:48 pm
 
Just a word of warning, the walls are not a no-brainer. Doing them
wrong can lead to severe moisture/mold problems. I recently attended a
building science seminar and they showed us serious issues with
insulation slapped up on basement walls. The take home message is that
you can insulate but you have to allow moisture to escape so that the
basement continues to "dry to the inside".

See:
http://www.buildingscience.com/resources/foundations/basement_insulation_systems.pdf


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