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Old 02-22-2012, 09:44 AM   #1
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Shoud I reuse and throw away ?


One of my room has dropcelings. I plan to put a drywall instead of dropceiling. So I did find insulation on top of the drop ceiling panels.

How do I know the insulation is no longer good ? Can I reuse it when i put my drywall or should I throw it out and use new insulation ?

http://i699.photobucket.com/albums/v...1/P1010030.jpg
http://i699.photobucket.com/albums/v...1/P1010029.jpg

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Old 02-22-2012, 09:50 AM   #2
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Shoud I reuse and throw away ?


Looks like there may be mold growing on it. Most often caused from lack or venting, dryer or bathroom vent just blowing into the attic instead of being vented outside?

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Old 02-22-2012, 10:24 AM   #3
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Originally Posted by joecaption View Post
Looks like there may be mold growing on it. Most often caused from lack or venting, dryer or bathroom vent just blowing into the attic instead of being vented outside?
Thank you !
There is no bathroom in this area but dryer and washer is there but dryer has a vent.

So what should I be doing now ? throw this out and buy new insulation ?
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Old 02-22-2012, 11:39 AM   #4
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Shoud I reuse and throw away ?


chuck it...

how well is the attic space vented?? are there any black patches on the roofing material?? this would indicate insufficient venting
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Old 02-22-2012, 03:07 PM   #5
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Yeah, it is no longer good. I see mold
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Old 02-22-2012, 10:44 PM   #6
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Shoud I reuse and throw away ?


Throw it, could be mold with the washing machine and the warm, moist air rising between the grid: http://www.inspectapedia.com/sickhou...rglassMold.htm

I see some air infiltration: http://www.finehomebuilding.com/PDF/Free/021105092.pdf

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Old 02-22-2012, 11:50 PM   #7
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Shoud I reuse and throw away ?


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Originally Posted by GBR in WA View Post
Throw it, could be mold with the washing machine and the warm, moist air rising between the grid: http://www.inspectapedia.com/sickhou...rglassMold.htm

I see some air infiltration: http://www.finehomebuilding.com/PDF/Free/021105092.pdf

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Ok. Got it. Thank you. I will replace this with new insulation.

Also - I need to see how to ensure enough vent to the attic.
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Old 02-24-2012, 01:23 AM   #8
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look for a plastic vapor barrier under the insulation on the drywall ceiling below. If so, use the 300, if not- the 150: http://www.airvent.com/homeowner/pro...it-specs.shtml

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Old 02-24-2012, 10:44 PM   #9
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Shoud I reuse and throw away ?


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Originally Posted by GBR in WA View Post
look for a plastic vapor barrier under the insulation on the drywall ceiling below. If so, use the 300, if not- the 150: http://www.airvent.com/homeowner/pro...it-specs.shtml

Gary
What is 300 ?

You mean to say - lay down vapor barrier on drywall then install insulation..?
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Old 02-25-2012, 09:57 AM   #10
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Shoud I reuse and throw away ?


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What is 300 ?

You mean to say - lay down vapor barrier on drywall then install insulation..?
300 is the ratio of footprint to ventilation requirements.

Google Attic Ventilation and NFA requirements.
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Old 02-25-2012, 11:10 PM   #11
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My Post #8, just below the chart (in the link):

THE SIMPLE MATHEMATICS OF A BALANCED RIDGE VENTILATION SYSTEM
  • According to most building codes, you need 1 square foot of ventilation for every 150 square feet of attic floor space.
  • For new home construction that includes a vapor retarder, the minimum is 1 square foot of ventilation for every 300 square feet of attic floor space.
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Old 02-26-2012, 02:42 AM   #12
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Shoud I reuse and throw away ?


Quote:
Originally Posted by GBR in WA View Post
My Post #8, just below the chart (in the link):

THE SIMPLE MATHEMATICS OF A BALANCED RIDGE VENTILATION SYSTEM
  • According to most building codes, you need 1 square foot of ventilation for every 150 square feet of attic floor space.
  • For new home construction that includes a vapor retarder, the minimum is 1 square foot of ventilation for every 300 square feet of attic floor space.
Gary
Got it about attic floor space.

Regarding vapor retader - is it a paper kind of material ?
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Old 02-26-2012, 02:12 PM   #13
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http://www.energysavers.gov/your_hom.../mytopic=11810

http://www.buildingscience.com/docum...vapor-barriers

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Old 02-26-2012, 09:46 PM   #14
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Shoud I reuse and throw away ?


Thank you. I will go over contents.

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