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timber 11-30-2007 04:28 PM

still cold
 
Anybody out there know if you can blow insulation into walls that already have paper-backed insulation in them? The walls I have on this old 50's ranch are only filled with this thin insulation that doesn't even fill the cavity. I've done a ton of other insulating ie. attic, crawlspace etc. but our bedrooms are still cold, even the outside walls are cold to the touch. Any imput would be greatly appreciated!

Mike Swearingen 12-01-2007 11:20 AM

If the vapor-barrier backed insulation has a cavity between it and the outer wall, you can certainly blow more iinsulation into the cavity. Don't compact insulation, however, as that will totally defeat its purpose.
Good Luck!
Mike

timber 12-01-2007 01:30 PM

That's what I was worried about. there is quite a bit of unfilled space but if I blow in some and compress the stuff thats there, it won't do me anygood right?

Cole 12-08-2007 11:21 AM

Quote:

Originally Posted by timber (Post 77742)
That's what I was worried about. there is quite a bit of unfilled space but if I blow in some and compress the stuff thats there, it won't do me anygood right?

Well, how thick is the current insulation?

I am assuming you have 2x4 walls?

timber 12-08-2007 02:01 PM

yep 2x4. I just do't understand why they used such a thin small type of insulation. I guess maybe it would'nt matter if it got compressed, 'cause I don't think it's doing much to begin with. I'm going to say maybe an inch thick. I bet theres close to an inch on either side of it in the cavity.

Cole 12-08-2007 02:34 PM

How much wall SF are we talking about?

LawnGuyLandSparky 12-08-2007 05:03 PM

Quote:

Originally Posted by timber (Post 79242)
yep 2x4. I just do't understand why they used such a thin small type of insulation.

In 1975 oil was .49 per gallon.

timber 12-08-2007 07:01 PM

There's about 200sft/room. I was 10 years old in '75 and my Dad drove a '71 Mustang Grande that had a Cleveland in it and I can still remember him #!-in about gas prices, he cussed a little to much ( he was a sailor after all)!

Cole 12-08-2007 07:49 PM

Quote:

Originally Posted by timber (Post 79289)
There's about 200sft/room.

200SF Total or 200SF a Room?

timber 12-08-2007 08:39 PM

200sqft.per room

Cole 12-08-2007 10:02 PM

Ok, how are you going to be accessing the wall cavity?

Drill a hole in each stud bay to insulate it?

Are you going to do interior walls or exterior walls or both?

timber 12-09-2007 12:17 PM

I don't know, if I do it on the outside I have to go through the clapboard siding and that old black compressed insulating board. Do I need to go in from both sides because of the existing insulation to try and get as much fill as possible? I'm not opposed to doing that. It's still better than pulling all the drywall. I just want to know if I"m going to get any better R-value. Or maybe I should look into spray foam instead of blown-in?

Cole 12-09-2007 01:39 PM

I think "blown in" would your easiest choice and cost effective.

If it was me, I would go to every exterior wall and cut holes for the tube in each bay along the perimeter of each exterior wall. If you current insulation is not doing any good, you can simply blow the insulation in and it will be ok.

How thin is the current insulation?

timber 12-09-2007 02:04 PM

Are you talkin inside or outside or both? The current insulation is just a thin, yellow fibreglass insulation inbetween a black paper vapor barrier. It's about an inch thick. It's cheap #!%! My walls are freezing on the inside!

Cole 12-09-2007 02:24 PM

I am talking inside!

I know exactly what kind of insulation you are talking about.

You are right, it is cheap s**t!


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