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-   -   Insulation : Faced and unfaced (http://www.diychatroom.com/f103/insulation-faced-unfaced-133762/)

Alan 02-14-2012 09:00 PM

Insulation : Faced and unfaced
 
I have to be honest : I don't really understand the concept of faced vs unfaced, and when one should use faced in lieu of unfaced.


Can someone explain this to me?

Alan 02-14-2012 09:01 PM

Argh. I think i found the answer I was looking for.

Alan 02-14-2012 09:16 PM

Ok, but I do have a question that I can't seem to answer by looking at the requirements that I found.

Is insulation required between floors? If so, what R-Value does it need to be?


zone 4C.

Gary in WA 02-14-2012 09:45 PM

Only between a conditioned (living space) and an unconditioned one--- crawlspace/main floor, attic/upstairs floor.

http://publicecodes.citation.com/ico..._11_sec002.htm

Vapor barriers: http://www.buildingscience.com/docum...commendations/

Certain exterior insulation mute the v.b. requirement: after reading, hit "next section" , etc., etc., etc.http://publicecodes.citation.com/ico...001_par003.htm

Gary

Alan 02-16-2012 08:30 PM

Hey Gary,

I was reading another thread on this topic and I saw that you said something about taping the seams on the facing. What kind of tape is normally used for that? Plain old duct tape?

To take that one step further, I assume it would be a good idea to tape around electrical boxes and pipes that stick through the facing as well?

Gary in WA 02-17-2012 03:13 PM

Quote:

Originally Posted by Alan (Post 855430)
Hey Gary,

I was reading another thread on this topic and I saw that you said something about taping the seams on the facing. What kind of tape is normally used for that? Plain old duct tape?----

I'd be surprised if I said to tape a rip in the facing paper. The facing is area-weighed so any slash, rip, tear, hole doesn't matter much; https://docs.google.com/viewer?a=v&q...9yRrrdP1VBztDg


To take that one step further, I assume it would be a good idea to tape around electrical boxes and pipes that stick through the facing as well?

--------

Air sealing is a different subject. Yes, air seal the drywall (ADA): http://www.buildingscience.com/docum...wall-approach/

Make sure the insulation is touching the drywall to prevent convective loops, though low-density f.g. has inherent c.l.'s: http://www.buildingscience.com/docum...ty-insulation/ Don't inset staple walls.

Gary

Alan 02-17-2012 07:50 PM

Very good reads there. Thanks a lot.

Something else crossed my mind while I was reading that, so here it is :

If you're supposed to cut the insulation to fit tightly around obstructions (IE : electrical boxes) what should be done between the electrical box and the subsiding in an exterior wall? Compressing the insulation to fit isn't a good idea from what I was reading. What other option is there?

Nailbags 02-18-2012 01:49 PM

Quote:

Originally Posted by Alan (Post 856193)
Very good reads there. Thanks a lot.

Something else crossed my mind while I was reading that, so here it is :

If you're supposed to cut the insulation to fit tightly around obstructions (IE : electrical boxes) what should be done between the electrical box and the subsiding in an exterior wall? Compressing the insulation to fit isn't a good idea from what I was reading. What other option is there?

when you install around a electrical box you slit the batt place half behind it then cut the front out top bottom then fold in and place to the side. I whis I had a photo of how to do this. Next time i do a insulation job I will take photos and post.

Alan 02-22-2012 08:19 PM

Quote:

Originally Posted by Nailbags (Post 856667)
when you install around a electrical box you slit the batt place half behind it then cut the front out top bottom then fold in and place to the side. I whis I had a photo of how to do this. Next time i do a insulation job I will take photos and post.

That would be awesome.

:thumbup:

Alan 02-23-2012 09:35 AM

I was looking at some videos and they brought me to this :


Since my exterior walls are 2x4 would it be better to spray foam behind the electrical boxes? Would I get better R-value out of 1 to 1-1/2" of spray foam than I would with fiberglass batts cut to fit?

Windows on Wash 02-25-2012 09:01 AM

That is correct.

Seal up the electrical boxes as well so that when you drywall, the wall is tight on both sides.

When the wall is exposed, seal every gap, crack, or air loss point you can spot.

Air loss is far more critical to efficiency than R-Values in most cases. Air loss is also much more responsible for moisture issues than faced vs. un-faced insulation.

It carries about 100X as much water as a faced vs. un-faced question.


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