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The R value of a material is the thermal resistance of the material, so is dependent on the material's thickness. R is also the inverse of a material's thermal conductivity U.
To work it out you need the k value ( the thermal conductivity) of the material and the thickness, then R=thickness/k.
The k value for structural concrete (of density 2300kg/m3) is 1.6 W/mK (Units: Watts / (metre x degrees Kelvin) so for a thickness 100mm (0.1m) of this concrete, R=0.06 m2°C/W.
Note that the R value in imperial units will not be the same. Check the units for any R value of any material that is given.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoit would depend on the thickness. An 8 inch wall is less than1R Value, which is equal to a single pain glass.
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Does concrete have an R value. 8 inches is equal to about a single pane of glass. Not much at all...?
Yes. Don't know for sure but its pretty low. however note that R value depends on the thickness. You double the thickness you double the R value.
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$75000 TO $250000
What is lightweight foam concrete?
trinity trade foamed concrete Concrete foam insulation is 100% Fireproof and that is one its major selling points over other forms of home insulation. It is also 100% Mold Proof including all types of toxic mold There is no leaching of toxic gasses, it is 100% Non-Toxic, Free of CFC's & Formaldehyde Concrete foam insulation offers a very high R-value, No loss of R-value over time If offers excellent soundproofing qualities. Once in place it is Non-Shrinking and Non-Settling There are no future disposal problems and it is Non-Hazardous as waste It is fully bug and Rodent Proof The primary components of concrete foam insulation are cement which is made of calcium, magnesium oxide and alumina, water and air. When the home is demolished in the distant future no harmful waste is produced. What remains of the concrete foam insulation is easily broken down and remains inert in a landfill. It can also be crushed and repurposed in the future. Concrete foam insulation is blown in to walls and cavities and once in place provides an outstanding R-value plus all of the benefits listed above. It has been installed in the National Audubon Societies headquarters and even Nobel prize winner Al Gore's estate. Because the cement destroys bugs protective coatings they do not nest or live in walls that have been sprayed with it. There are no ozone destroying gasses or off gassing of toxic gasses into the home as some insulations cause. beijing trintiy trade is one maker of concrete foam insulation http://www.foamed.com.cn
What is the value of r tesar's last supper?
$1,000 ---- $10,000
How thick a concrete wall would be needed to give the same insulating value as 3 and a half inches of fiberglass?
Poured concrete has an R value of about 0.08/inch. Fiberglass batt has an R value of about 3.14/inch (blown fiberglass wall insulation is about 3.2/inch). From these values we can calculate that the equivalent insulating thickness of concrete would be about 3.5x3.14/0.08 = 137.4 inches. Note that concrete blocks have a somewhat better insulating value due to the incorporated air pockets. A 4" concrete block has an R value of about 0.2/inch An 8" concrete block has an R value of about 0.15/inch A 12" concrete block has an R value of about 0.1/inch
What is the R-value of Normal Weight Concrete per inch of material?
Normal Weight Concrete at 150 pcf has an R value of 1.22 per inch thickness
What has the highest R Value Concrete or Stucco or fiberglass insulation?
fiberglass
Which material has the highest r value stucco pine board concrete or fiber glass insulation?
Fiberglass Insulation, R Value of 3.14. Pine board has an R Value of 1.74
What is the slenderness ratio for a intermediate concrete column?
That is depending on your KL/r value . sammy Structural engineer That is depending on your KL/r value . sammy Structural engineer
Does concrete have an R value. 8 inches is equal to about a single pane of glass. Not much at all...?
Yes. Don't know for sure but its pretty low. however note that R value depends on the thickness. You double the thickness you double the R value.
What must be the slump value for different grade of concrete?
what is the slump value for M20 concrete
What has the author R J Currie written?
R. J. Currie has written: 'Carbonation depths in structural-quality concrete' -- subject(s): Concrete, Concrete construction
What is in situ concrete?
D concrete which r mixed in d site itself is known as in situ concrete:)
Steel reinforcement bars add stability to concrete walls Do they also enhance the insulating value of concrete?
Concrete does not have a very good insulating value, and neither does steel. The mixture of the two will add structural stability to what you are building, but it (commonly) will not enhance the concrete's insulating value.
What has the author R H H Kirkham written?
R. H. H. Kirkham has written: 'The compaction of concrete road slabs' -- subject(s): Concrete slabs, Testing, Vibrators, Vibrated concrete
What has the author Ward R Malisch written?
Ward R. Malisch has written: 'Aggregates for concrete' -- subject(s): Aggregates (Building materials), Concrete
