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Answered 2010-01-06 08:08:34

I have been searching for an online calculator that can give me accurate results, I recently found a web site that has a nice R value calculator; you can check it out at this address -

You can calculate all kinds of insulation products and applications, there is also lots of info about R value and U value.

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What does the r in r-value mean?

The R-value of insulating material is an indication of its effectiveness in reducing heat flow through walls, floor, and ceiling of a structure.

Insulating materials are rated by their?


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 best type of attic insulation?

Insulation is rated in terms of thermal resistance, called R-value, which indicates the resistance to heat flow. The higher the R-value, the greater the insulating effectiveness. The R-value of thermal insulation depends on the type of material, its thickness, and its density. In calculating the R-value of a multi-layered installation, the R-values of the individual layers are added.

Is a material with a lower R-value a better insulator than a material with a high R-value?

No. A higher R-value is a better insulator.

What is the proper R value for insulating a crawl space in Delaware?

It's cold in Delaware, go for R-36.

What is r value?

R value is a measure of the ability of a material to retard, or slow down, the movement of heat.

Which material has the highest r value stucco pine board concrete or fiber glass insulation?

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What is the R value of concrete?

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.

How thick is r 5?

"R" is a value associated with heat penetration. The thickness of a material (for example, typical pink panther insulation) of any "R-value" will vary. If, for example, your wall space involves either a 2"x4", 2"x6", or even 2"x8" wall space then the material you insulate with will, of course, vary in size, however the "R-value" of your material will remain its rated value.

What is the R value of attic insulation covered with plywood decking?

Every insulation has a different R value. It ultimately is determined by which insulation you will be using. Now lets do rough estimate. 4" thick, regular fiberglass mat has R-value of 13. Assuming that plywood has the same to half the insulating value of fiberglass, 1/2" plywood would have 1/8 to 1/16 of R-value of that 4" mat. Roughly R-1.6 to R-0.8

A material with a higher or lower R-value is a better insulator?


What is the insulating value of plexiglass As in the R value of a house wall Or the U value of glass?

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Does R value means the resistance a material has to the flow of heat?

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Write an algorithm to calculate the area of a circle?

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What is the R-value of Normal Weight Concrete per inch of material?

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Which material has the highest R- value?

It appears that Aerogel is the greatest thermal insulator for solids.

Is r-value good or bad?

it is a good thing i think R Value is the thermal resistance of a given material. The higher the R Value the more thermal resistance and the better the insulation. So, an R48 roof system is warmer than an R32 roof system. All insulation materials are rated by their R Value. An inch of rigid insulation has a higher R Value than an inch of fiberglass insulation. Check with the insulation manufacturer for the R Value.

What are insulating materials rated by?

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What is the r value for pink fiberglass insulators?

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Do 22.5 equal to 15r5?

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What factor that govern the value of resistance in a resistor?

It can be because of the material used.As we know R=PL/A where R=resistance P=resistivity of the material used L=length of the conductor A=area of cross section of the conductor

How do you calculate current load for 24 V DC?

There are three formulas to calculate current. They are I = E/R, I = W/E and I = the sq. root of W/R. As you can see there is one value missing in your question so it can not be answered.

What has the author D R Lamb written?

D. R. Lamb has written: 'Electrical conduction mechanisms in thin insulating films'