Adding attic insulation

pomelo · 10-22-2009, 05:12 PM

I want to add insulation over my existing insulation in my attic. The trusses are spaced 22" oc. My current insulation is fiberglass faced bats 22" that is probably 6" to 8" high.
Lowes has a sale on 15" unfaced insulation going on right now (R30). I am planning on just running this perpendicular to the existing insulation. Is this the right type of insulation to run? Should I just buy a wider unfaced insulation? I live in Florida.

My last question is in regards to a mezzanine in the attic. There is insulation under the mezzanine. Should I run the unfaced bats over the mezzanine? Will this cause any condensation problems (plywood acting as second vapor barrier)?

Scuba_Dave · 10-22-2009, 05:45 PM

Yes, you can install this perpindicular
You want unfaced to go on top of existing insulation
Wider means less "seems" overall - so slightly better

What do you mean by mezzazine?
Any pics?

pomelo · 10-22-2009, 06:09 PM

Quote:

Originally Posted by Scuba_Dave

Yes, you can install this perpindicular
You want unfaced to go on top of existing insulation
Wider means less "seems" overall - so slightly better

What do you mean by mezzazine?
Any pics?

It is just a plywood deck on top of the lower chords of the truss. It is just a platform for storage.

jogr · 10-22-2009, 06:19 PM

If you aren't getting condensation now I wouldn't think adding insulation to the top would cause it. Just run it on over as you said.

I did exactly what you described a few years ago and it made a noticeable difference in how often my A/C and furnace run.

10-22-2009, 05:12 PM	#1
pomelo Member Join Date: Dec 2008 Posts: 104	Adding attic insulation I want to add insulation over my existing insulation in my attic. The trusses are spaced 22" oc. My current insulation is fiberglass faced bats 22" that is probably 6" to 8" high. Lowes has a sale on 15" unfaced insulation going on right now (R30). I am planning on just running this perpendicular to the existing insulation. Is this the right type of insulation to run? Should I just buy a wider unfaced insulation? I live in Florida. My last question is in regards to a mezzanine in the attic. There is insulation under the mezzanine. Should I run the unfaced bats over the mezzanine? Will this cause any condensation problems (plywood acting as second vapor barrier)?

10-22-2009, 05:45 PM	#2
Scuba_Dave Xtreme DIY'r Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248	Adding attic insulation Yes, you can install this perpindicular You want unfaced to go on top of existing insulation Wider means less "seems" overall - so slightly better What do you mean by mezzazine? Any pics?

10-22-2009, 06:19 PM	#4
jogr Member Join Date: Jul 2007 Posts: 1,463	Adding attic insulation If you aren't getting condensation now I wouldn't think adding insulation to the top would cause it. Just run it on over as you said. I did exactly what you described a few years ago and it made a noticeable difference in how often my A/C and furnace run.

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Adding attic insulation