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Old 03-17-2007, 05:19 PM   #1
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Sealing exterior wall from inside the house?


Ok, here's perhaps a strange one.

I've been rewiring my entire house for the last few months. Since the quantity of receptacles in any given room is less than would be required by code (or even common sense), I have been adding additional boxes/recepts in the process of rewiring the existing.

Our house has old cast iron baseboard radiators along several walls which are now obsolete as we have installed central heat/air. The trouble is, these interfere with the installation of new receptacles which I like to set at 12" AFF to C/L of box. So, in the living room, I decided to tear the radiators off the walls to get them out of my way. Although I wasn't too suprised, the plaster behind the radiators was in terrible condition, so I tore it down too (at this point, I still haven't installed any receptacle boxes). Then I figured since I'd gone this far with the wall demo, I'd tear down the rest of the walls in the room. Let's just say that my house was built in 1911 and has zero insulation in the walls so this was always my goal but as far as my wife is concerned, this wasn't supposed to happen for another 3 years!

At this point, I'm ready to put in the firestops, insulate the walls, install a vapor barrier and rock (oh, right-and install those receptacles, too!). The outer finish of the house is stucco applied to what appears to be a t&g sheathing (which is exposed on the inside). Obviously I cannot apply a house cover, i.e. Tyvek, but is there something that I could do to the sheathing from the inside to create an air barrier?

Opinions and thoughts from anyone who has dealt with a similar situation are welcome!

TTFN,
Jimmy

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Old 03-17-2007, 05:39 PM   #2
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Sealing exterior wall from inside the house?


I cannot think of anything on the market for such an application.

Anything that you install from the inside, would not accomplish 'wrapping the entire house'.

This can only be done from the outside - over the exterior of the home...

Good Luck

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Old 03-19-2007, 09:13 AM   #3
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Sealing exterior wall from inside the house?


How about that spray in foam insulation? That would be the tightest and require no vapor barrier. Not a DIY endeavor though.
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Old 03-19-2007, 09:20 AM   #4
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Sealing exterior wall from inside the house?


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How about that spray in foam insulation? That would be the tightest and require no vapor barrier. Not a DIY endeavor though.

True, very true.. Spray foam is a vapor barrier in itself....(completely seals the cavity space with a water proof material while insulating...)

Good suggestion....tho about 3 times the cost of regular insulation.
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Old 03-19-2007, 01:14 PM   #5
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Sealing exterior wall from inside the house?


Good point. My municipal code requires a minimum of R-19 for walls which, per local inspectors, I am obligated to comply with since I had the smart idea of tearing the walls to shreds! Anyway, to comply, I need to fur out the faces of the existing studs to create a 2x6 (i.e. 5.5") depth for this insulation. Not that this is much of an undertaking (existing windows excluded) but I was told by one of my coworkers that I could install the foam and create an R-19 value in the existing 2x4 space. And of course you make a great point about it acting as a barrier to air infiltration. Guess I'm just too cheap (or broke as it may be) to hire someone to apply the insulation (I'm told that this type of insulation is not a DIY product).

Thanks!
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Old 03-19-2007, 01:26 PM   #6
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Sealing exterior wall from inside the house?


Well, I suppose EVRYTHING is DIY if you are up to it. Check out http://www.fomofoam.com/
http://www.tigerfoam.com/
http://www.foampower.com/

I have only seen the pros use the pro stuff on TV. I have no experience with the DIY kits for wall insulation. The "great stuff" cans I have used. The stuff sticks to EVERYTHING and is a real PIA to clean up. If you go this route please post back the results, I'm curious.
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Old 03-20-2007, 09:16 PM   #7
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Sealing exterior wall from inside the house?


Tried the first website and was blinded by the garrish colors (I think it's written somewhere [like in Websites for Dummies] that black and blue and yellow is a bad color scheme for a website. Stupid maybe, but it always seems to spell L-O-S-E-R vendor, IME).

Anyway, the other two were quite helpful. Foampower sells the same product as the first and I've stopped by the tigerfoam.com website before (which I forgot until I revisited). The neat idea is on tigerfoam.com's website where you apply a coating of the product in a 2x4 cavity and then cover with unfaced R-13 batts (the foam is supposedly R-7 per inch thickness/depth). I may go this way since I like the idea of the product functioning as an air, moisture and sound barrier. I will check with my local inspector to make sure it's cool. Also, the video where they show using the slow-rise formula to fill an existing cavity seems promising, esp. in my basement where I have about 4 foot of uninsulated plaster wall above the foundation.

I didn't do the cost to install/ROI calcs yet but this system does seem pricey at first glance.

Anyway, thanks for the links! Very helpful and informative. I will certainly post pictures (showing the cat plastered to the wall, albeit just before covering it with SHRock) and follow up if I go this route.

Thanks!
Jimmy

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