R value of house

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R value of house

Postby contactknoxy » Thu Jun 13, 2019 12:14 am

Hi there I was trying to work out the R value of my house for my floor as I'll be renting it out and I need to achieve a R0.9 value based on insulation that was installed prior to 2016 (R value is less)

My calcs as follows
1) internal resistance 0.09
2) hardward floor 18m thick 0.09 (excludes carpet at this point of time)
3) Framing at 150 x 50 joists 600 centres 0.087
4) Foil to u/s of joist (no thermal rating for foil by its self)
5) Air gap created between flooring and foil - assume similar to wall 0.58
6) Foundation sheltered 600 high 0.24
Total is 0.09+0.09+0.087+0+0.58+0.24 = R1.006

Sound about right??
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Joined: Thu Jun 13, 2019 12:06 am

Re: R value of house

Postby Albrecht Stoecklein » Mon Sep 09, 2019 12:39 pm

Hi contactknoxy,

Sorry about my late reply. That calculation is not quite right, because there is no air gap above the insulation foil that is immediately under the framing. So you have to treat that as a thermal bridge.

The easiest is if you use the DesNav online calculator to do that calculation: https://www.designnavigator.solutions/CRC.php
Albrecht Stoecklein
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Joined: Sat Jun 13, 2009 5:30 pm

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