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Insulation R Value

Cordwood The softer the wood, the better the insulation value and the less shrinkage or expansion. Insulation about R-1 per inch.


R-VALUE: 44.0, SUITABLE FOR: new construction.THERMAL PERFORMANCE: Insulated with cellulose: R-36.0. Insulated with high-performance fiberglass (R-4.5 per in.): R-44.0.PROS:• Optional 2x3 insulated wall and high-efficency fiberglass give potential for even higher R-values.• Large capacity for moisture storage allows the wall cavity to dry gradually.CONS:• Panels are often manufactured off site, trucked to site, and craned into place, which all add to cost.• Design may be subject to joist ...


Compared to fiberglass insulation, our natural fiber insulation: * Doesn't require a warning label * Has mostly recycled content * Non-toxic; no respiratory or other safety equipment recommended * Retains R-value in colder conditions because it is denser * Has superior acoustical properties; controls airborne noise such as airplanes * Requires less energy to manufacturer * Does not contain formaldehyde

from This Old House

Insulation Education

Insulating attic rafters is the best way to maximize comfort and minimize energy bills. We show you the right way. | Illustration: Ian Worpole |


R-VALUE: 39.5, SUITABLE FOR: new construction, retrofit.THERMAL PERFORMANCE: Used in this system, cellulose (at R-3.5 per in.) yields an overall value of R-39.5.PROS:• Continuously protected air barrier keeps wall cavity dry.• Large moisture-storage capacity allows wall to dry gradually.• During retrofits, interior walls can remain intact.CONS:• Unconventional framing can increase production time and labor costs.• Increases the gross building area by 3%.

from Gizmodo

The Ultimate Backpacking Outfit

I can't prove it, but I'm pretty sure this thing is magic. It's the most comfortable backpacking sleep pad I've ever used by a tremendous margin. It's two and a half inches thick, it has an R-value of 4.9 (which means it provides incredible insulation), and weighs only 19 ounces. Inside, over a hundred triangular barriers reflect heat back to your body, with no bulky padding added, so it packs down to almost the size of a Nalgene bottle.


The technique involves laying two beads of mortar, followed by filing the insulation cavity in the middle (here it is filled with sawdust mixed with lime). Then the cordwood is set in the mortar beads. This provides an insulation R-value of 1.5 per inch of wall. A 16" cordwood wall has an R-value of 24.


Icynene closed-cell spray foam provides better R value, as well as additional structure.


ETW: Foundation - 4" PIC, 2x6 Framing with Fiberglass Batt


Insulation Basics: Heat, R-Value and the Building Envelope: