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R value of concrete wall above grade. R value measures how well certain building insulation materials can resist heat. The minimum thermal resistance r value of the insulating materials installed in the wall cavity between the framing members and continuously on the walls shall be as specified in table c402 2 based on framing type and construction materials used in the wall assembly the r value of integral insulation installed in concrete masonry units cmu shall not be used in determining compliance with. R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90 urea terpolymer foam 4 48. The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook.
Depending on the density of the blocks an 8 inch thick block wall without any other type of. Know exactly how much you need with our project calculators. Concrete and block walls. Recommended home insulation r values.
564 to obtain copies of this reference. Concrete block wall with perlite in cavities r 2 9. When determining how much insulation you need don t guesstimate calculate. The basement walls are 99 above grade ground.
A few of the walls in the planned finished portion will be against the poured cement basement walls. The house is a few years old located in the 4a region close to the 5a region border in pa. The higher the r value the better the thermal performance of the insulation. Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch.
Currently there is insulation on the basement walls. Insulation level are specified by r value. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. The higher the r value the greater the insulation performance.
The r value listed by pca for a normal weight 144 pcf 6 inch concrete wall is 1 23 and includes inside and outside air film resistances which contribute to overall thermal resistance. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.
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