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Old 03-29-2011, 11:50 PM   #1
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Fiberglass insulation in basement?


Just bought a brand new home in July. I'm finishing the basement. I already started framing with 2x4's 1 inch from wall. Will the rolls of fiberglass insulation with the paper facing be fine?

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Old 03-30-2011, 06:42 AM   #2
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Fiberglass insulation in basement?


There are a lot of resources online regarding insulation in basements.

I wish there was some consistency between them!

You can definitely use fiberglass in a basement.

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Old 03-30-2011, 01:10 PM   #3
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Yes. SOOOO many different opinions. That's why I thought I'd try to get a little more specific advise. Or maybe someone else could at least tell me they did it with no problem, even though time will only tell the whole truth.

Is the paper facing considered a vapor barrier? Thought I read that somewhere.
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Old 03-30-2011, 04:42 PM   #4
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Fiberglass insulation in basement?


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Originally Posted by nateshirk View Post
Yes. SOOOO many different opinions. That's why I thought I'd try to get a little more specific advise. Or maybe someone else could at least tell me they did it with no problem, even though time will only tell the whole truth.

Is the paper facing considered a vapor barrier? Thought I read that somewhere.
Search for ROXUL on Google. Its much better for insulating basements as it doesn't absorb moisture.
Has a greater R value/in. than f/g also!
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Old 03-30-2011, 06:41 PM   #5
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Fiberglass insulation in basement?


Where are you located?

Will you be using foam board first? http://www.buildingscience.com/docum...ent-insulation

Seal the rims first; http://www.buildingscience.com/docum...m-at-rim-joist

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Old 03-30-2011, 10:07 PM   #6
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Where are you located?

Will you be using foam board first? http://www.buildingscience.com/docum...ent-insulation

Seal the rims first; http://www.buildingscience.com/docum...m-at-rim-joist

Gary
I was trying to avoid foam board. I live in PA where we get all kinds of weather. I'll look into sealing the rim joist.
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Old 03-30-2011, 11:48 PM   #7
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Fiberglass insulation in basement?


This will get you started; Basement Framing

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Old 03-31-2011, 05:32 PM   #8
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Fiberglass insulation in basement?


When I finished our basement I used john mansville insulation I got from menards. The batts were encapsulated in plastic. They were actually made for basement walls.
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Old 04-02-2011, 09:02 PM   #9
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http://www.buildingscience.com/docum...ent-insulation

http://www.buildingscience.com/docum...ts?full_view=1

http://www.buildingscience.com/docum...gs?full_view=1

There is a lot of good info on basement insulation, try the white box above this page and hit "search" box...
No air gap, sill sealer under p.t. plate, ADA, fire-stop every 10' lineally, etc.....

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Old 04-04-2011, 05:52 PM   #10
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Fiberglass insulation in basement?


Wow.. thanks for all the tons of info in those links, but my brain is too tired to read all that right now.

Basically, just keep all basement air from reaching the cement wall? And seal the rim joist?
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Old 04-04-2011, 07:26 PM   #11
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Fiberglass insulation in basement?


GBR's comments and everything on buildingscience.com are right on. This info is consistent among those who know proper procedures.
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Old 04-04-2011, 08:03 PM   #12
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Fiberglass insulation in basement?


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When I finished our basement I used john mansville insulation I got from menards. The batts were encapsulated in plastic. They were actually made for basement walls.
Depending on where you live you may be posting back in a couple of years on how to do mold remediation.

You really should check out building science, they have the right stuff, developed by both solid engineering and lab testing.
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Old 04-04-2011, 08:04 PM   #13
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Fiberglass is fine, every builder ive worked for uses the fb insul on the basement walls and also for finished basement walls. If your house is properly sealed on the outside foundation then you shouldnt have a prob with moisture.
I every builder jumped off a bridge would you follow?, you really do need to do some solid research.

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Old 04-04-2011, 09:52 PM   #14
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Fiberglass insulation in basement?


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Depending on where you live you may be posting back in a couple of years on how to do mold remediation.

You really should check out building science, they have the right stuff, developed by both solid engineering and lab testing.
Actually 6 years later and a 125 gallon saltwater tank later no problems here.
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Old 04-05-2011, 09:04 AM   #15
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Fiberglass insulation in basement?


There is a right and a wrong way to complete any project. Recommending a method just because you have personally not had any issues with it does not make it correct and is irresponsible. I've seen roofs with 5 layers of shingles that looked nice and didn't leak, shower tile installed on drywall that looked nice and didn't leak, and windows installed with no flashing or insulation that looked nice and didn't leak... That doesn't make any of those methods proper, and should be avoided at all costs, just as framing or fg insulation in direct contact with a foundation wall should be avoided at all costs (even if it is wrapped in plastic).

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