Construction R value calculations errors?

Please tell me if you found any bugs.

Construction R value calculations errors?

Postby clint » Tue Feb 16, 2010 6:10 pm

Just been using the construction R value calculator and I noticed that there is considerable variance in the wall construction R when compared to the same construction in the BRANZ guide. I have previously found a good match -- wondering if a bug has developed??

I tried various wall claddings/frame options with R 2.8 batts but kept getting construction Rs 0.2 or more less than BRANZ tables.

I was checking a Hebel panel cladding on 600 cc studs, 800 cc nogs with R 2.8 insulation and got a construction R of 1.97 !! I would expect circa R 2.4. Tried a few variables with no joy. The roof calculator seems to be OK.
clint
 
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Joined: Tue Feb 16, 2010 5:34 pm

Re: Construction R value calculations errors?

Postby Albrecht Stoecklein » Thu Feb 18, 2010 9:56 am

Hi Clint,

Thanks for your feedback. I just tried the hebel panels and get an R-value of 2.47.

Can you please send me a screenshot of the option which you tried?

Thanks

Albrecht

Image
Albrecht Stoecklein
 
Posts: 341
Joined: Sat Jun 13, 2009 5:30 pm

Re: Construction R value calculations errors?

Postby clint » Thu Feb 18, 2010 6:14 pm

Thanks Albrecht.

I can see my error. I was using 50mm studs - forgetting to enter studs as 90

Nice programme, very useful

Clint
clint
 
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Re: Construction R value calculations errors?

Postby Albrecht Stoecklein » Sat Feb 20, 2010 8:09 am

No problem. Cheers
Albrecht Stoecklein
 
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