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Old 06-01-2012, 10:03 AM   #1
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Need Advice Radiant Barrier


Hello everybody,
have another challenge that I need help with. My house is a (2) story newly built home with cathedral roof. Inside the attic a typical insulation on top of the ceiling and the rest is bare wood. There is also a gas furnace/fan unit that supplies hot/cold air to the second floor. Now when the temperatures are in 70's approaching 80's the attic tends to get pretty tosty and it is not even Summer yet. I've seen many pictures of attics insulated with Radiant Barrier (see image example THIS IS NOT MY ATTIC)Need Advice Radiant Barrier-attic_gallery_1.jpg

I would appreciate any advice on the questions below:
1. Does the attic needs to be fully or partially insulated?
2. What is the best and inexpensive Radiant Barrier out there?
3. Cons and pros
4. How to detect potential roof leak once the roof is covered with the radiant layer.
Any advise, as always, is greatly appreciated.

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Old 06-01-2012, 01:05 PM   #2
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Need Advice Radiant Barrier


Picture of your roof from inside would help...... cathedral or open attic.

Your location is important for better answers.....

Gary

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Old 06-01-2012, 01:13 PM   #3
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Need Advice Radiant Barrier


Attic is unfinished with pink insulated foam at the bottom between the ceiling joists. The house is in Long Island NY. I will add some pictures later today.
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Old 06-03-2012, 10:33 PM   #4
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How to resize photos to post them here.

Gary
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Old 06-07-2012, 09:33 AM   #5
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Need Advice Radiant Barrier


#2 - if you have a company that makes the stuff close by, they may sell seconds. I have one by me and they sell a 500ft roll for $35 bc it is wrinkled or has a edge that may not be perfect. Since they cannot sell this at normal price and they do not want to just trash it, you can pick it up cheap.
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Old 06-08-2012, 07:43 AM   #6
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Need Advice Radiant Barrier


Quote:
Originally Posted by I'll do it! View Post
I would appreciate any advice on the questions below:
1. Does the attic needs to be fully or partially insulated?
2. What is the best and inexpensive Radiant Barrier out there?
3. Cons and pros
4. How to detect potential roof leak once the roof is covered with the radiant layer.
Any advise, as always, is greatly appreciated.
  1. I have yet to be in an attic that had enough insulation or better yet, enough separation between conditioned and unconditioned spaces.
  2. There are a bunch out there and they are all similar. Whether or not they are proper for your application is what remains to be seen.
  3. Pros and Cons
    • Cons - they are a PITB to put up if you have trusses, they provide little benefit in certain climates, they can be a waste of money
    • Pros - they can help with some of the radiant heat gain in systems where insulation is at a minimum.
  4. You pull it down and look for it. The water will just run down the back and drain out so you can find it without tearing it down from inside. On a side note, most roof leaks can be found from outside the roof.


The reality is that radiant barrier have much more application value down South where they are cooling climates. In NY, not so much. If you ventilation is proper, the natural convection of air should keep the attic relatively mild and have a properly sealed and sufficient insulation layer on the floor and ducts will negate any of the radiant heat gain from the roof deck/attic.

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