Questions tagged [r-value]

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3 votes
2 answers
127 views

Can R values be averaged?

Suppose there is a wall and half of its area has R-value 10, and the other half has R-value 20. Is the total R-value of the wall 15? In other words, can R-values be averaged weighted by area? Please ...
David Levner's user avatar
3 votes
1 answer
2k views

Should electrical box face plates be caulked?

I am in a dilemma whether to caulk electrical box face plates or not. The reason to do it is to improve the R value of the house but a downside is that any removal will be slightly more messy and will ...
amphibient's user avatar
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0 votes
2 answers
211 views

Garage insulation really need R-39?

I read it from here: https://www.homedepot.ca/en/home/ideas-how-to/home-repair-and-maintenance/how-to-choose-insulation.html It recommends my garage "Walls Above Grade" should have R-19/ R19+...
Yashiharu's user avatar
0 votes
2 answers
124 views

How are insulation R-values calculated for wall cavities of inconsistent thickness?

I'm designing a house which will have unconventional wall construction that varies in thickness. The wall cavities will be filled with dense-packed cellulose, rated at R-3.7 per inch. I want to ...
Bungle's user avatar
  • 223
0 votes
1 answer
37 views

How to find a very low U-value replacement window for a bathroom?

I found 0.27 for a Pella 250 series at Lowe's. I would like to find a window with a lower U-value. How do I go about that?
aparente001's user avatar
0 votes
1 answer
3k views

Where can I find the U-factor (U-value) for a Pella window?

I am trying to compare the Pella windows sold by the Pella sales person with the Pella windows sold at the big box stores (Lowe's, Home Depot). I have found a spec sheet with this information for ...
aparente001's user avatar