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gracecol
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| Joined: | Sat Apr 22nd, 2006 |
| Location: | Hauppauge, New York USA |
| Posts: | 328 |
| Exams Taken: | PD, CD, SP, BP, BT | | Exams Passed: | CD, SP, BP, BT | | Describes Me: | LEEP AP- *****T E C T |
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Posted: Thu Oct 2nd, 2008 01:26 am |
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I found that the 2 books have a list of R-values for different materials, but they both differ in the R-values.
i.e. BATT or BLANKET, Kaplan = R 11.00, ALLEN = 3.3 (BIG DIFFERENCE)
Loose fill = Kaplan R 3.90, ALLEN R 3.5
Kaplan edition is 2007 and Allen is the old one 2nd. edition 1990.
My question is, which list should I use. I saw on the redrover list that we must know R-values for different materilas. Is there any other list that I could use? I did not see anything in Ballast.
Thanks for your help!!!
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gracecol
Member
| Joined: | Sat Apr 22nd, 2006 |
| Location: | Hauppauge, New York USA |
| Posts: | 328 |
| Exams Taken: | PD, CD, SP, BP, BT | | Exams Passed: | CD, SP, BP, BT | | Describes Me: | LEEP AP- *****T E C T |
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Posted: Thu Oct 2nd, 2008 02:38 am |
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Well, now I'm studying Ching's BCI, and there is a new list with different R-values......which is just the same that was posted on the redrover list.
I guess I will try to learn the R-Values from Ching. Any other idea?
Anybody outhere? thanks anyway!
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JMF
Member
| Joined: | Thu Jul 10th, 2008 |
| Location: | Yorktown, New York USA |
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Posted: Thu Oct 2nd, 2008 03:51 am |
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| Maybe take a look the the insulation companies and see what it is in the real world. Owens Corning is a good site to start. I use there site all the time when doing drawings.
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stl-guy
Architect
| Joined: | Mon Jan 16th, 2006 |
| Location: | St. Louis, Missouri USA |
| Posts: | 3533 |
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Posted: Thu Oct 2nd, 2008 04:43 am |
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gracecol wrote: I found that the 2 books have a list of R-values for different materials, but they both differ in the R-values.
i.e. BATT or BLANKET, Kaplan = R 11.00, ALLEN = 3.3 (BIG DIFFERENCE)
Loose fill = Kaplan R 3.90, ALLEN R 3.5
Kaplan edition is 2007 and Allen is the old one 2nd. edition 1990.
My question is, which list should I use. I saw on the redrover list that we must know R-values for different materilas. Is there any other list that I could use? I did not see anything in Ballast.
Thanks for your help!!!
3 1/2" of batt fiber glass insulation will generally be rated at R11.
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gracecol
Member
| Joined: | Sat Apr 22nd, 2006 |
| Location: | Hauppauge, New York USA |
| Posts: | 328 |
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Posted: Thu Oct 2nd, 2008 06:15 pm |
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Yes I will, thanks both of you!
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shinto909
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| Joined: | Fri Dec 21st, 2007 |
| Location: | Chicago |
| Posts: | 433 |
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Posted: Thu Oct 2nd, 2008 06:22 pm |
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| also remember that R is rated per inch. maybe this is why they are differing
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