Questions tagged [r-value]

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Is it ok to boost finished attic kneewall insulation with rigid foam board over the batts?

Have a finished attic with fiberglass batts (poorly) installed between the kneewall studs--the batts are faced and the facing is on the inside. I want to put an airtight, taped layer of rigid ...
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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 ...
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28 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?
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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 ...