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Old 01-21-2011, 01:37 AM   #1
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Upgrading wall insulation from inside


Doing a remodel on our small master bath and removed all drywall since there was 30 yrs worth of many paint layers.

Since I have the DW removed I thought it would be a good time to upgrade the existing R-11 and install a vapor barrier on the inside (northern Nevada).

Searched the web and haven't really come up with anything that I can see as a beneficial upgrade besides higher density R-13.

The house is a 73 with fiber board siding, tar paper, r-11, then 1/2" dw.

There has to be a better affordable system I can do from the inside. What are your thoughts? Spray foam looked good but too expensive and not easy to obtain.

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Old 01-21-2011, 07:14 AM   #2
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Upgrading wall insulation from inside


Sounds to me like you're at a point where spending extra money can only gain almost immeasurable results - like a dog chasing it's tail. Sure you can spray foam it (see "tiger foam" for online ordering of DIY foam kits) or use polyisocyanurate panels, or extruded polystyrene - but what will you gain between R11 and R13 or so? That amount of savings can be negligible compared to an unsealed attic...

Because remember more insulation is only part of the equation concerning heat loss; you should be spending equal amounts of time and money on air infiltration as you are on increaing the R-value of your insulation, since a drafty R30 house is still a cold one.

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Old 01-22-2011, 12:42 PM   #3
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Upgrading wall insulation from inside


Quote:
Originally Posted by ccarlisle View Post
Sounds to me like you're at a point where spending extra money can only gain almost immeasurable results - like a dog chasing it's tail. Sure you can spray foam it (see "tiger foam" for online ordering of DIY foam kits) or use polyisocyanurate panels, or extruded polystyrene - but what will you gain between R11 and R13 or so? That amount of savings can be negligible compared to an unsealed attic...

Because remember more insulation is only part of the equation concerning heat loss; you should be spending equal amounts of time and money on air infiltration as you are on increaing the R-value of your insulation, since a drafty R30 house is still a cold one.
Those were my thoughts and just want to be sure I am not over looking anything new out there. There were some major openings for plumbing as they never sealed back then, so I have sealed all the penetrations.
Thanks!
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Old 01-22-2011, 12:53 PM   #4
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Upgrading wall insulation from inside


If you must use fiberglass, there is R-15HD out there or compressing R-19 to get the biggest loser; http://docs.google.com/viewer?a=v&q=...Sl4MDm_aao1YUg

http://www.diychatroom.com/f98/how-b...ulation-90438/

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