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MJG196 12-26-2012 08:23 AM

Novice Preparing to Insulate Attic - A Couple Questions
 
Happy Post-Christmas, Everyone!

OK, lemme lay it out for you. I have a small attic (I have a 1400 sq ft. townhome) with very little - and old - fiberglass batting for insulation. I thought that an economical way to make a big improvement would be the big fibreglass rolls they sell at Home Depot.

I live in Northern Virginia, where the weather usually dips to 10 degrees in the Winter and reaches 100 in the Summer.

Rather than ask the people at HD, I was hoping you guys and gals could recommend which type of fiberglass (or insulation method) I should use.

Thanks for even reading this! :party:

Windows on Wash 12-26-2012 08:26 AM

Air Seal first, then insulate.

Blown in is easiest but the blown in cellulose at Home Depot is the cheap (ammonium sulfate) stabilized stuff.

Make sure your baffles are in there before blowing the attic full (R-50).

MJG196 12-26-2012 09:03 AM

Quote:

Originally Posted by Windows on Wash (Post 1079786)
Air Seal first, then insulate.

Blown in is easiest but the blown in cellulose at Home Depot is the cheap (ammonium sulfate) stabilized stuff.

Make sure your baffles are in there before blowing the attic full (R-50).

Thanks a lot, WoW. However, if I don't go with the blown-in method and use the rolled fiberglass, which particular type would you recommend?

EDIT: I am trying to go inexpensive, while not sacrificing quality, if ya know what I mean.

Windows on Wash 12-26-2012 10:00 AM

Make sure you air seal regardless. You will never have as good a chance as you do right now.

After that, any rolled out (un-faced) fiberglass is fine.

joecaption 12-26-2012 10:03 AM

http://www.energystar.gov/index.cfm?...sulation_table

Got a picture of the room?

MJG196 12-26-2012 12:25 PM

Quote:

Originally Posted by joecaption (Post 1079828)

Hey - this is greatly appreciated!

I can post a pic this evening.

Secondary question: When I lay the insulation down, should it be the exact width of the space between the studs, or (for example) if the insulation is 15" wide and I have 13" between studs, can I mush it in there?

Windows on Wash 12-26-2012 04:02 PM

Don't mush it in there but it should fit between.

After that, cover the bottom chords of the trusses with additional rolls going across them.

MJG196 12-26-2012 06:45 PM

Here are two (crappy) pictures:

http://i142.photobucket.com/albums/r...ps233e627b.jpg

http://i142.photobucket.com/albums/r...pscbf08f5f.jpg

Windows on Wash 12-26-2012 07:15 PM

Easiest is going to be blown in...trust me.

Get your vent chute/baffles in, spray foam all the top plates, and blow it to R-50.

I promise you that if you do it right the first time, you will be happy that you did.

AndyGump 12-26-2012 10:03 PM

I have to disagree with Windows on this one.
The blown in is way more expensive (in this area anyway) than the un-faced batt fiberglass insulation.
And the Kraft Faced fiberglass is about twice the price of comparable un-faced.
If it were my house I would get in there with a leaf rake and spread what is there as evenly as I could filling in all the bays to about the same level.
Then roll out he un-faced FG.

Andy.

Windows on Wash 12-26-2012 10:44 PM

Quote:

Originally Posted by AndyGump (Post 1080317)
I have to disagree with Windows on this one.
The blown in is way more expensive (in this area anyway) than the un-faced batt fiberglass insulation.
And the Kraft Faced fiberglass is about twice the price of comparable un-faced.
If it were my house I would get in there with a leaf rake and spread what is there as evenly as I could filling in all the bays to about the same level.
Then roll out he un-faced FG.

Andy.

Never said it was cheaper....just easier.

I would prefer to just clean up all that old stuff given there is so little of it and then work with a blank canvas or the air sealing.

At that point, the blown in is mucho easier and quicker. No cutting, dragging, fitting, etc.

MJG196 12-28-2012 11:30 AM

Quote:

Originally Posted by AndyGump (Post 1080317)
I have to disagree with Windows on this one.
The blown in is way more expensive (in this area anyway) than the un-faced batt fiberglass insulation.
And the Kraft Faced fiberglass is about twice the price of comparable un-faced.
If it were my house I would get in there with a leaf rake and spread what is there as evenly as I could filling in all the bays to about the same level.
Then roll out he un-faced FG.

Andy.

Thanks, Andy. You mean something like THIS EcoTouch Stuff?

handyman_20772 12-31-2012 06:11 PM

What is the square footage of the attic? The reason I'm asking is since you have such a small area to work with I would just add faced batts to the joist areas with no insulation, air sealing first of course. From the pictures it looks like your ceiling joists are spaced 24" on center and they are 2x6 joists correct? So what I would purchase is R-19, 22" wide faced for the ceiling joists, placed with the facing towards the living space below, and add an additional R-30 unfaced placed perpendicular to the ceiling joists on top of your current insulation. Add air baffles to the rafter bays to provide proper ventilation for the attic.

Fix'n it 01-01-2013 09:49 AM

Quote:

Originally Posted by Windows on Wash (Post 1079786)
the blown in cellulose at Home Depot is the cheap (ammonium sulfate) stabilized stuff.

ok, so what is so bad about it ? and where to get the good stuff ? what is the brand name ?

Windows on Wash 01-01-2013 10:27 AM

Quote:

Originally Posted by Fix'n it (Post 1083858)
ok, so what is so bad about it ? and where to get the good stuff ? what is the brand name ?

All the major cellulose manufacturers have a borate only version. Most insulation supply houses will have plenty of options that fall into that category. Call around and you will find one.

Cellpak
Applegate
National Fiber
etc.


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